Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid‐Atlantic Ridge 30°N
Identifieur interne : 006450 ( Main/Exploration ); précédent : 006449; suivant : 006451Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid‐Atlantic Ridge 30°N
Auteurs : D. K. Blackman [États-Unis] ; B. Ildefonse [France] ; B. E. John [États-Unis] ; Y. Ohara [Japon] ; D. J. Miller [États-Unis] ; N. Abe [Japon] ; M. Abratis [Allemagne] ; E. S. Andal [Philippines] ; M. Andreani [France] ; S. Awaji [Japon] ; J. S. Beard [États-Unis] ; D. Brunelli [Italie] ; A. B. Charney [États-Unis] ; D. M. Christie [États-Unis] ; J. Collins [États-Unis] ; A. G. Delacour [France] ; H. Delius [Royaume-Uni] ; M. Drouin [France] ; F. Einaudi [France] ; J. Escartín [France] ; B. R. Frost [États-Unis] ; G. Früh-Green [Suisse] ; P. B. Fryer [États-Unis] ; J. S. Gee [États-Unis] ; M. Godard [France] ; C. B. Grimes [États-Unis] ; A. Halfpenny [Australie] ; H. Hansen [Norvège] ; A. C. Harris [États-Unis] ; A. Tamura [Japon] ; N. W. Hayman [États-Unis] ; E. Hellebrand [États-Unis] ; T. Hirose [Japon] ; J. G. Hirth [États-Unis] ; S. Ishimaru [Japon] ; K. T. M. Johnson [États-Unis] ; G. D. Karner [États-Unis] ; M. Linek [États-Unis] ; C. J. Macleod [Royaume-Uni] ; J. Maeda [Japon] ; O. U. Mason [États-Unis] ; A. M. Mccaig [Royaume-Uni] ; K. Michibayashi [Japon] ; A. Morris [Royaume-Uni] ; T. Nakagawa [Japon] ; T. Nozaka [Japon] ; M. Rosner [Allemagne] ; R. C. Searle [Royaume-Uni] ; G. Suhr [Allemagne] ; M. Tominaga [États-Unis] ; A. Von Der Handt [Allemagne] ; T. Yamasaki [Japon] ; X. Zhao [États-Unis]Source :
- Journal of Geophysical Research: Solid Earth [ 0148-0227 ] ; 2011-07.
Descripteurs français
- Wicri :
- topic : Forage, Sciences de la terre, Géophysique.
English descriptors
- KwdEn :
- Alteration, Ambient conditions, Amphibolite, Anomaly, Atlantic ridge, Atlantis, Atlantis bank, Atlantis massif, Atlantis massif drilling, Axial, Axial zone, Basalt, Blackman, Borehole, Boschi, Breccia, Bulk composition, Canales, Cann, Cannat, Cataclastic, Central dome, Clinopyroxene, College station, Constraint, Core complexes, Core samples, Corona, Corrugated surface, Crust, Crustal, Crustal accretion, Crystal plastic deformation, Deep drilling, Deformation, Detachment, Detachment fault, Detachment shear zone, Detachment zone, Diabase, Domal, Domal core, Drill core, Drilling, Drilling constraints, Drilling results, Drouin, Earth planet, Earth science, Earth sciences, Environmental sciences, Facies, Fault breccias, Fault zone, Fault zones, Fluid flow, Footwall, Footwall rotation, Fresh peridotite, Fryer, Gabbro, Gabbroic, Gabbroic body, Gabbroic rocks, Gabbroic sequence, Geochem, Geochemical, Geol, Geophys, Geophysical, Geophysics, Geosciences, Geosyst, Godard, Greenschist, Grime, Hayman, Henig, Hirose, Hydration, Hydrothermal, Igneous, Igneous contacts, Ildefonse, Impedance contrast, Indian ridge, Intrusion, Iodp, Iodp expeditions, Iodp hole, Iodp site, Karson, Lateral, Lett, Lithology, Lithosphere, Lithospheric, Localized, Lower crust, Lower part, Macleod, Mafic, Magma, Magma supply, Magmatic, Magmatic accretion, Magmatism, Mantle peridotite, Massif, Mbsf, Mccaig, Metamorphism, Michibayashi, Modeling, Morb, Nozaka, Occs, Ocean drilling program, Ocean ridges, Ocean sciences, Oceanic, Oceanic core, Oceanic core complexes, Oceanic lithosphere, Olivine, Olivine gabbro, Olivine grains, Paleomagnetic, Paleomagnetic data, Peridotite, Plagioclase, Postcruise results, Rapid cooling, Refraction, Ridge, Rock type, Rock types, Schist, Schroeder, Seafloor, Seafloor mapping, Seafloor studies, Seafloor topography, Seawater, Seismic, Seismic data, Serpentinization, Serpentinized, Serpentinized harzburgite, Serpentinized peridotite, Shallow depths, Shear zone, Southern part, Southern ridge, Strain localization, Suhr, Talc, Tectonic, Tremolite, Troctolite, Troctolite intervals, Troctolites, Tucholke, Ultramafic, Ultramafic rocks, Universit, Uplift, Upper part, Velocity structure, Western shoulder, Woods hole, Zircon, Zircon ages, Zone.
- Teeft :
- Alteration, Ambient conditions, Amphibolite, Anomaly, Atlantic ridge, Atlantis, Atlantis bank, Atlantis massif, Atlantis massif drilling, Axial, Axial zone, Basalt, Blackman, Borehole, Boschi, Breccia, Bulk composition, Canales, Cann, Cannat, Cataclastic, Central dome, Clinopyroxene, College station, Constraint, Core complexes, Core samples, Corona, Corrugated surface, Crust, Crustal, Crustal accretion, Crystal plastic deformation, Deep drilling, Deformation, Detachment, Detachment fault, Detachment shear zone, Detachment zone, Diabase, Domal, Domal core, Drill core, Drilling, Drilling constraints, Drilling results, Drouin, Earth planet, Earth science, Earth sciences, Environmental sciences, Facies, Fault breccias, Fault zone, Fault zones, Fluid flow, Footwall, Footwall rotation, Fresh peridotite, Fryer, Gabbro, Gabbroic, Gabbroic body, Gabbroic rocks, Gabbroic sequence, Geochem, Geochemical, Geol, Geophys, Geophysical, Geophysics, Geosciences, Geosyst, Godard, Greenschist, Grime, Hayman, Henig, Hirose, Hydration, Hydrothermal, Igneous, Igneous contacts, Ildefonse, Impedance contrast, Indian ridge, Intrusion, Iodp, Iodp expeditions, Iodp hole, Iodp site, Karson, Lateral, Lett, Lithology, Lithosphere, Lithospheric, Localized, Lower crust, Lower part, Macleod, Mafic, Magma, Magma supply, Magmatic, Magmatic accretion, Magmatism, Mantle peridotite, Massif, Mbsf, Mccaig, Metamorphism, Michibayashi, Modeling, Morb, Nozaka, Occs, Ocean drilling program, Ocean ridges, Ocean sciences, Oceanic, Oceanic core, Oceanic core complexes, Oceanic lithosphere, Olivine, Olivine gabbro, Olivine grains, Paleomagnetic, Paleomagnetic data, Peridotite, Plagioclase, Postcruise results, Rapid cooling, Refraction, Ridge, Rock type, Rock types, Schist, Schroeder, Seafloor, Seafloor mapping, Seafloor studies, Seafloor topography, Seawater, Seismic, Seismic data, Serpentinization, Serpentinized, Serpentinized harzburgite, Serpentinized peridotite, Shallow depths, Shear zone, Southern part, Southern ridge, Strain localization, Suhr, Talc, Tectonic, Tremolite, Troctolite, Troctolite intervals, Troctolites, Tucholke, Ultramafic, Ultramafic rocks, Universit, Uplift, Upper part, Velocity structure, Western shoulder, Woods hole, Zircon, Zircon ages, Zone.
Abstract
Expeditions 304 and 305 of the Integrated Ocean Drilling Program cored and logged a 1.4 km section of the domal core of Atlantis Massif. Postdrilling research results summarized here constrain the structure and lithology of the Central Dome of this oceanic core complex. The dominantly gabbroic sequence recovered contrasts with predrilling predictions; application of the ground truth in subsequent geophysical processing has produced self‐consistent models for the Central Dome. The presence of many thin interfingered petrologic units indicates that the intrusions forming the domal core were emplaced over a minimum of 100–220 kyr, and not as a single magma pulse. Isotopic and mineralogical alteration is intense in the upper 100 m but decreases in intensity with depth. Below 800 m, alteration is restricted to narrow zones surrounding faults, veins, igneous contacts, and to an interval of locally intense serpentinization in olivine‐rich troctolite. Hydration of the lithosphere occurred over the complete range of temperature conditions from granulite to zeolite facies, but was predominantly in the amphibolite and greenschist range. Deformation of the sequence was remarkably localized, despite paleomagnetic indications that the dome has undergone at least 45° rotation, presumably during unroofing via detachment faulting. Both the deformation pattern and the lithology contrast with what is known from seafloor studies on the adjacent Southern Ridge of the massif. There, the detachment capping the domal core deformed a 100 m thick zone and serpentinized peridotite comprises ∼70% of recovered samples. We develop a working model of the evolution of Atlantis Massif over the past 2 Myr, outlining several stages that could explain the observed similarities and differences between the Central Dome and the Southern Ridge.
Url:
DOI: 10.1029/2010JB007931
Affiliations:
- Allemagne, Australie, France, Italie, Japon, Norvège, Philippines, Royaume-Uni, Suisse, États-Unis
- Angleterre, Auvergne-Rhône-Alpes, Bade-Wurtemberg, Brandebourg, Californie, District de Fribourg-en-Brisgau, Languedoc-Roussillon, Midi-Pyrénées, Occitanie (région administrative), Rhode Island, Rhône-Alpes, Région de Kantō, Texas, Yorkshire-et-Humber, Île-de-France
- Austin (Texas), Berkeley (Californie), Fribourg-en-Brisgau, Houston, Leeds, Lyon, Montpellier, Paris, Potsdam, Providence (Rhode Island), Tokyo, Toulouse, Villeurbanne
- Université Brown, Université Claude Bernard Lyon 1, Université Montpellier 2, Université de Leeds, Université de Tokyo, Université du Texas à Austin
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K." last="Blackman">D. K. Blackman</name><affiliation wicri:level="1"><country wicri:rule="url">États-Unis</country></affiliation><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Scripps Institution of Oceanography, University of California, California, San Diego, La Jolla</wicri:regionArea><wicri:noRegion>La Jolla</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">États-Unis</country></affiliation></author><author><name sortKey="Ildefonse, B" sort="Ildefonse, B" uniqKey="Ildefonse B" first="B." last="Ildefonse">B. Ildefonse</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Géosciences Department, Université Montpellier 2, Montpellier</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement><settlement type="city">Montpellier</settlement></placeName><orgName type="university">Université Montpellier 2</orgName></affiliation></author><author><name sortKey="John, B E" sort="John, B E" uniqKey="John B" first="B. E." last="John">B. E. John</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geology and Geophysics, University of Wyoming, Wyoming, Laramie</wicri:regionArea><wicri:noRegion>Laramie</wicri:noRegion></affiliation></author><author><name sortKey="Ohara, Y" sort="Ohara, Y" uniqKey="Ohara Y" first="Y." last="Ohara">Y. 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Andal</name><affiliation wicri:level="1"><country xml:lang="fr">Philippines</country><wicri:regionArea>Philex Mining Corporation, Pasig City</wicri:regionArea><wicri:noRegion>Pasig City</wicri:noRegion></affiliation></author><author><name sortKey="Andreani, M" sort="Andreani, M" uniqKey="Andreani M" first="M." last="Andreani">M. Andreani</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Géologie, Université Claude Bernard Lyon 1, Villeurbanne</wicri:regionArea><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Villeurbanne</settlement><settlement type="city" wicri:auto="agglo">Lyon</settlement><settlement type="city">Lyon</settlement></placeName><orgName type="university">Université Claude Bernard Lyon 1</orgName></affiliation></author><author><name sortKey="Awaji, S" sort="Awaji, S" uniqKey="Awaji S" first="S." last="Awaji">S. Awaji</name><affiliation wicri:level="4"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Geosystem Engineering, University of Tokyo, Tokyo</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region><settlement type="city">Tokyo</settlement></placeName><orgName type="university">Université de Tokyo</orgName></affiliation></author><author><name sortKey="Beard, J S" sort="Beard, J S" uniqKey="Beard J" first="J. S." last="Beard">J. S. Beard</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Virginia Museum of Natural History, Virginia, Martinsville</wicri:regionArea><wicri:noRegion>Martinsville</wicri:noRegion></affiliation></author><author><name sortKey="Brunelli, D" sort="Brunelli, D" uniqKey="Brunelli D" first="D." last="Brunelli">D. Brunelli</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Scienze della Terra, Universita Modena, Modena</wicri:regionArea><wicri:noRegion>Modena</wicri:noRegion></affiliation></author><author><name sortKey="Charney, A B" sort="Charney, A B" uniqKey="Charney A" first="A. B." last="Charney">A. B. Charney</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geosciences, Oregon State University, Oregon, Corvalis</wicri:regionArea><wicri:noRegion>Corvalis</wicri:noRegion></affiliation></author><author><name sortKey="Christie, D M" sort="Christie, D M" uniqKey="Christie D" first="D. M." last="Christie">D. M. Christie</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Alaska, Fairbanks</wicri:regionArea><wicri:noRegion>Fairbanks</wicri:noRegion></affiliation></author><author><name sortKey="Collins, J" sort="Collins, J" uniqKey="Collins J" first="J." last="Collins">J. Collins</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Marine Geology and Geophysics, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole</wicri:regionArea><wicri:noRegion>Woods Hole</wicri:noRegion></affiliation></author><author><name sortKey="Delacour, A G" sort="Delacour, A G" uniqKey="Delacour A" first="A. G." last="Delacour">A. G. Delacour</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Dynamique Terrestre Planétaire, Université Toulouse, Toulouse</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation></author><author><name sortKey="Delius, H" sort="Delius, H" uniqKey="Delius H" first="H." last="Delius">H. Delius</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Geology, University of Leicester, Leicester</wicri:regionArea><wicri:noRegion>Leicester</wicri:noRegion></affiliation></author><author><name sortKey="Drouin, M" sort="Drouin, M" uniqKey="Drouin M" first="M." last="Drouin">M. Drouin</name><affiliation wicri:level="1"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire Geosciences, Université Réunion, Saint‐Denis</wicri:regionArea><wicri:noRegion>Saint‐Denis</wicri:noRegion><wicri:noRegion>Saint‐Denis</wicri:noRegion></affiliation></author><author><name sortKey="Einaudi, F" sort="Einaudi, F" uniqKey="Einaudi F" first="F." last="Einaudi">F. Einaudi</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Géosciences Department, Université Montpellier 2, Montpellier</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement><settlement type="city">Montpellier</settlement></placeName><orgName type="university">Université Montpellier 2</orgName></affiliation></author><author><name sortKey="Escartin, J" sort="Escartin, J" uniqKey="Escartin J" first="J." last="Escartín">J. Escartín</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Groupe de Geosciences Marines, Institut de Physique du Globe, Paris</wicri:regionArea><placeName><region type="region">Île-de-France</region><region type="old region">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author><author><name sortKey="Frost, B R" sort="Frost, B R" uniqKey="Frost B" first="B. R." last="Frost">B. R. Frost</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geology and Geophysics, University of Wyoming, Wyoming, Laramie</wicri:regionArea><wicri:noRegion>Laramie</wicri:noRegion></affiliation></author><author><name sortKey="Fruh Reen, G" sort="Fruh Reen, G" uniqKey="Fruh Reen G" first="G." last="Früh-Green">G. Früh-Green</name><affiliation wicri:level="1"><country xml:lang="fr">Suisse</country><wicri:regionArea>Department of Earth Sciences, ETH Zurich, Zurich</wicri:regionArea><wicri:noRegion>Zurich</wicri:noRegion></affiliation></author><author><name sortKey="Fryer, P B" sort="Fryer, P B" uniqKey="Fryer P" first="P. B." last="Fryer">P. B. Fryer</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Hawaii, Honolulu</wicri:regionArea><wicri:noRegion>Honolulu</wicri:noRegion></affiliation></author><author><name sortKey="Gee, J S" sort="Gee, J S" uniqKey="Gee J" first="J. S." last="Gee">J. S. Gee</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Scripps Institution of Oceanography, University of California, California, San Diego, La Jolla</wicri:regionArea><wicri:noRegion>La Jolla</wicri:noRegion></affiliation></author><author><name sortKey="Godard, M" sort="Godard, M" uniqKey="Godard M" first="M." last="Godard">M. Godard</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Géosciences Department, Université Montpellier 2, Montpellier</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement><settlement type="city">Montpellier</settlement></placeName><orgName type="university">Université Montpellier 2</orgName></affiliation></author><author><name sortKey="Grimes, C B" sort="Grimes, C B" uniqKey="Grimes C" first="C. B." last="Grimes">C. B. Grimes</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geosciences, Mississippi State University, Mississippi, Mississippi State</wicri:regionArea><wicri:noRegion>Mississippi State</wicri:noRegion></affiliation></author><author><name sortKey="Halfpenny, A" sort="Halfpenny, A" uniqKey="Halfpenny A" first="A." last="Halfpenny">A. Halfpenny</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Earth Sciences, Australian National University, Canberra, ACT</wicri:regionArea><wicri:noRegion>ACT</wicri:noRegion></affiliation></author><author><name sortKey="Hansen, H" sort="Hansen, H" uniqKey="Hansen H" first="H." last="Hansen">H. Hansen</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>Department of Earth Science, University of Bergen, Bergen</wicri:regionArea><wicri:noRegion>Bergen</wicri:noRegion></affiliation></author><author><name sortKey="Harris, A C" sort="Harris, A C" uniqKey="Harris A" first="A. C." last="Harris">A. C. Harris</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geology and Environmental Sciences, Norwich University, Vermont, Northfield</wicri:regionArea><wicri:noRegion>Northfield</wicri:noRegion></affiliation></author><author><name sortKey="Tamura, A" sort="Tamura, A" uniqKey="Tamura A" first="A." last="Tamura">A. Tamura</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Earth and Environmental Sciences, Kanazawa University, Kanazawa</wicri:regionArea><wicri:noRegion>Kanazawa</wicri:noRegion></affiliation></author><author><name sortKey="Hayman, N W" sort="Hayman, N W" uniqKey="Hayman N" first="N. W." last="Hayman">N. W. Hayman</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Institute of Geophysics, University of Texas at Austin, Texas, Austin</wicri:regionArea><orgName type="university">Université du Texas à Austin</orgName><placeName><settlement type="city">Austin (Texas)</settlement><region type="state">Texas</region></placeName></affiliation></author><author><name sortKey="Hellebrand, E" sort="Hellebrand, E" uniqKey="Hellebrand E" first="E." last="Hellebrand">E. Hellebrand</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Hawaii, Honolulu</wicri:regionArea><wicri:noRegion>Honolulu</wicri:noRegion></affiliation></author><author><name sortKey="Hirose, T" sort="Hirose, T" uniqKey="Hirose T" first="T." last="Hirose">T. Hirose</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Kochi Institute for Core Sample Research, JAMSTEC, Nankoku City</wicri:regionArea><wicri:noRegion>Nankoku City</wicri:noRegion></affiliation></author><author><name sortKey="Hirth, J G" sort="Hirth, J G" uniqKey="Hirth J" first="J. G." last="Hirth">J. G. Hirth</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geological Sciences, Brown University, Rhode Island, Providence</wicri:regionArea><orgName type="university">Université Brown</orgName><placeName><settlement type="city">Providence (Rhode Island)</settlement><region type="state">Rhode Island</region></placeName></affiliation></author><author><name sortKey="Ishimaru, S" sort="Ishimaru, S" uniqKey="Ishimaru S" first="S." last="Ishimaru">S. Ishimaru</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Earth and Environmental Sciences, Kanazawa University, Kanazawa</wicri:regionArea><wicri:noRegion>Kanazawa</wicri:noRegion></affiliation></author><author><name sortKey="Johnson, K T M" sort="Johnson, K T M" uniqKey="Johnson K" first="K. T. M." last="Johnson">K. T. M. Johnson</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Hawaii, Honolulu</wicri:regionArea><wicri:noRegion>Honolulu</wicri:noRegion></affiliation></author><author><name sortKey="Karner, G D" sort="Karner, G D" uniqKey="Karner G" first="G. D." last="Karner">G. D. Karner</name><affiliation wicri:level="3"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Exxon‐Mobile URC, Texas, Houston</wicri:regionArea><placeName><settlement type="city">Houston</settlement><region type="state">Texas</region></placeName></affiliation></author><author><name sortKey="Linek, M" sort="Linek, M" uniqKey="Linek M" first="M." last="Linek">M. Linek</name><affiliation wicri:level="3"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Baker Hughes, Texas, Houston</wicri:regionArea><placeName><settlement type="city">Houston</settlement><region type="state">Texas</region></placeName></affiliation></author><author><name sortKey="Macleod, C J" sort="Macleod, C J" uniqKey="Macleod C" first="C. J." last="Macleod">C. J. Macleod</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Earth and Ocean Sciences, Cardiff University, Cardiff</wicri:regionArea><wicri:noRegion>Cardiff</wicri:noRegion></affiliation></author><author><name sortKey="Maeda, J" sort="Maeda, J" uniqKey="Maeda J" first="J." last="Maeda">J. Maeda</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Earth and Planetary Sciences, Hokkaido University, Sapporo</wicri:regionArea><wicri:noRegion>Sapporo</wicri:noRegion></affiliation></author><author><name sortKey="Mason, O U" sort="Mason, O U" uniqKey="Mason O" first="O. U." last="Mason">O. U. Mason</name><affiliation wicri:level="3"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Ecology Department, Lawrence Berkeley National Laboratory, California, Berkeley</wicri:regionArea><placeName><settlement type="city">Berkeley (Californie)</settlement><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Mccaig, A M" sort="Mccaig, A M" uniqKey="Mccaig A" first="A. M." last="Mccaig">A. M. Mccaig</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Earth Sciences, University of Leeds, Leeds</wicri:regionArea><orgName type="university">Université de Leeds</orgName><placeName><settlement type="city">Leeds</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Yorkshire-et-Humber</region></placeName></affiliation></author><author><name sortKey="Michibayashi, K" sort="Michibayashi, K" uniqKey="Michibayashi K" first="K." last="Michibayashi">K. Michibayashi</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Institute of Geosciences, Shizuoka University, Shizuoka</wicri:regionArea><wicri:noRegion>Shizuoka</wicri:noRegion></affiliation></author><author><name sortKey="Morris, A" sort="Morris, A" uniqKey="Morris A" first="A." last="Morris">A. Morris</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Earth and Environmental Sciences, University of Plymouth, Plymouth</wicri:regionArea><wicri:noRegion>Plymouth</wicri:noRegion></affiliation></author><author><name sortKey="Nakagawa, T" sort="Nakagawa, T" uniqKey="Nakagawa T" first="T." last="Nakagawa">T. Nakagawa</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Chemical and Life Sciences, Nihon University, Fujisawa</wicri:regionArea><wicri:noRegion>Fujisawa</wicri:noRegion></affiliation></author><author><name sortKey="Nozaka, T" sort="Nozaka, T" uniqKey="Nozaka T" first="T." last="Nozaka">T. Nozaka</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Earth Sciences, Okayama University, Okayama</wicri:regionArea><wicri:noRegion>Okayama</wicri:noRegion></affiliation></author><author><name sortKey="Rosner, M" sort="Rosner, M" uniqKey="Rosner M" first="M." last="Rosner">M. Rosner</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Mineral Properties and Transport Processes, GFZ, Potsdam</wicri:regionArea><placeName><region type="land" nuts="2">Brandebourg</region><settlement type="city">Potsdam</settlement></placeName></affiliation></author><author><name sortKey="Searle, R C" sort="Searle, R C" uniqKey="Searle R" first="R. C." last="Searle">R. C. Searle</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Earth Sciences, Durham University, Durham</wicri:regionArea><wicri:noRegion>Durham</wicri:noRegion></affiliation></author><author><name sortKey="Suhr, G" sort="Suhr, G" uniqKey="Suhr G" first="G." last="Suhr">G. Suhr</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Geologie und Mineralogie, Universitat zu Köln, Cologne</wicri:regionArea><wicri:noRegion>Cologne</wicri:noRegion><wicri:noRegion>Cologne</wicri:noRegion></affiliation></author><author><name sortKey="Tominaga, M" sort="Tominaga, M" uniqKey="Tominaga M" first="M." last="Tominaga">M. Tominaga</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Marine Geology and Geophysics, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole</wicri:regionArea><wicri:noRegion>Woods Hole</wicri:noRegion></affiliation></author><author><name sortKey="Von Der Handt, A" sort="Von Der Handt, A" uniqKey="Von Der Handt A" first="A." last="Von Der Handt">A. Von Der Handt</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Department of Geosciences, University of Freiburg, Freiburg</wicri:regionArea><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Fribourg-en-Brisgau</region><settlement type="city">Fribourg-en-Brisgau</settlement></placeName></affiliation></author><author><name sortKey="Yamasaki, T" sort="Yamasaki, T" uniqKey="Yamasaki T" first="T." last="Yamasaki">T. Yamasaki</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Earth and Planetary Sciences, Hokkaido University, Sapporo</wicri:regionArea><wicri:noRegion>Sapporo</wicri:noRegion></affiliation></author><author><name sortKey="Zhao, X" sort="Zhao, X" uniqKey="Zhao X" first="X." last="Zhao">X. Zhao</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Earth Sciences, University of California, California, Santa Cruz</wicri:regionArea><wicri:noRegion>Santa Cruz</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Geophysical Research: Solid Earth</title><title level="j" type="alt">JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><biblScope unit="vol">116</biblScope><biblScope unit="issue">B7</biblScope><biblScope unit="page-count">25</biblScope><date type="published" when="2011-07">2011-07</date></imprint><idno type="ISSN">0148-0227</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alteration</term><term>Ambient conditions</term><term>Amphibolite</term><term>Anomaly</term><term>Atlantic ridge</term><term>Atlantis</term><term>Atlantis bank</term><term>Atlantis massif</term><term>Atlantis massif drilling</term><term>Axial</term><term>Axial zone</term><term>Basalt</term><term>Blackman</term><term>Borehole</term><term>Boschi</term><term>Breccia</term><term>Bulk composition</term><term>Canales</term><term>Cann</term><term>Cannat</term><term>Cataclastic</term><term>Central dome</term><term>Clinopyroxene</term><term>College station</term><term>Constraint</term><term>Core complexes</term><term>Core samples</term><term>Corona</term><term>Corrugated surface</term><term>Crust</term><term>Crustal</term><term>Crustal accretion</term><term>Crystal plastic deformation</term><term>Deep drilling</term><term>Deformation</term><term>Detachment</term><term>Detachment fault</term><term>Detachment shear zone</term><term>Detachment zone</term><term>Diabase</term><term>Domal</term><term>Domal core</term><term>Drill core</term><term>Drilling</term><term>Drilling constraints</term><term>Drilling results</term><term>Drouin</term><term>Earth planet</term><term>Earth science</term><term>Earth sciences</term><term>Environmental sciences</term><term>Facies</term><term>Fault breccias</term><term>Fault zone</term><term>Fault zones</term><term>Fluid flow</term><term>Footwall</term><term>Footwall rotation</term><term>Fresh peridotite</term><term>Fryer</term><term>Gabbro</term><term>Gabbroic</term><term>Gabbroic body</term><term>Gabbroic rocks</term><term>Gabbroic sequence</term><term>Geochem</term><term>Geochemical</term><term>Geol</term><term>Geophys</term><term>Geophysical</term><term>Geophysics</term><term>Geosciences</term><term>Geosyst</term><term>Godard</term><term>Greenschist</term><term>Grime</term><term>Hayman</term><term>Henig</term><term>Hirose</term><term>Hydration</term><term>Hydrothermal</term><term>Igneous</term><term>Igneous contacts</term><term>Ildefonse</term><term>Impedance contrast</term><term>Indian ridge</term><term>Intrusion</term><term>Iodp</term><term>Iodp expeditions</term><term>Iodp hole</term><term>Iodp site</term><term>Karson</term><term>Lateral</term><term>Lett</term><term>Lithology</term><term>Lithosphere</term><term>Lithospheric</term><term>Localized</term><term>Lower crust</term><term>Lower part</term><term>Macleod</term><term>Mafic</term><term>Magma</term><term>Magma supply</term><term>Magmatic</term><term>Magmatic accretion</term><term>Magmatism</term><term>Mantle peridotite</term><term>Massif</term><term>Mbsf</term><term>Mccaig</term><term>Metamorphism</term><term>Michibayashi</term><term>Modeling</term><term>Morb</term><term>Nozaka</term><term>Occs</term><term>Ocean drilling program</term><term>Ocean ridges</term><term>Ocean sciences</term><term>Oceanic</term><term>Oceanic core</term><term>Oceanic core complexes</term><term>Oceanic lithosphere</term><term>Olivine</term><term>Olivine gabbro</term><term>Olivine grains</term><term>Paleomagnetic</term><term>Paleomagnetic data</term><term>Peridotite</term><term>Plagioclase</term><term>Postcruise results</term><term>Rapid cooling</term><term>Refraction</term><term>Ridge</term><term>Rock type</term><term>Rock types</term><term>Schist</term><term>Schroeder</term><term>Seafloor</term><term>Seafloor mapping</term><term>Seafloor studies</term><term>Seafloor topography</term><term>Seawater</term><term>Seismic</term><term>Seismic data</term><term>Serpentinization</term><term>Serpentinized</term><term>Serpentinized harzburgite</term><term>Serpentinized peridotite</term><term>Shallow depths</term><term>Shear zone</term><term>Southern part</term><term>Southern ridge</term><term>Strain localization</term><term>Suhr</term><term>Talc</term><term>Tectonic</term><term>Tremolite</term><term>Troctolite</term><term>Troctolite intervals</term><term>Troctolites</term><term>Tucholke</term><term>Ultramafic</term><term>Ultramafic rocks</term><term>Universit</term><term>Uplift</term><term>Upper part</term><term>Velocity structure</term><term>Western shoulder</term><term>Woods hole</term><term>Zircon</term><term>Zircon ages</term><term>Zone</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Alteration</term><term>Ambient conditions</term><term>Amphibolite</term><term>Anomaly</term><term>Atlantic ridge</term><term>Atlantis</term><term>Atlantis bank</term><term>Atlantis massif</term><term>Atlantis massif drilling</term><term>Axial</term><term>Axial zone</term><term>Basalt</term><term>Blackman</term><term>Borehole</term><term>Boschi</term><term>Breccia</term><term>Bulk composition</term><term>Canales</term><term>Cann</term><term>Cannat</term><term>Cataclastic</term><term>Central dome</term><term>Clinopyroxene</term><term>College station</term><term>Constraint</term><term>Core complexes</term><term>Core samples</term><term>Corona</term><term>Corrugated surface</term><term>Crust</term><term>Crustal</term><term>Crustal accretion</term><term>Crystal plastic deformation</term><term>Deep drilling</term><term>Deformation</term><term>Detachment</term><term>Detachment fault</term><term>Detachment shear zone</term><term>Detachment zone</term><term>Diabase</term><term>Domal</term><term>Domal core</term><term>Drill core</term><term>Drilling</term><term>Drilling constraints</term><term>Drilling results</term><term>Drouin</term><term>Earth planet</term><term>Earth science</term><term>Earth sciences</term><term>Environmental sciences</term><term>Facies</term><term>Fault breccias</term><term>Fault zone</term><term>Fault zones</term><term>Fluid flow</term><term>Footwall</term><term>Footwall rotation</term><term>Fresh peridotite</term><term>Fryer</term><term>Gabbro</term><term>Gabbroic</term><term>Gabbroic body</term><term>Gabbroic rocks</term><term>Gabbroic sequence</term><term>Geochem</term><term>Geochemical</term><term>Geol</term><term>Geophys</term><term>Geophysical</term><term>Geophysics</term><term>Geosciences</term><term>Geosyst</term><term>Godard</term><term>Greenschist</term><term>Grime</term><term>Hayman</term><term>Henig</term><term>Hirose</term><term>Hydration</term><term>Hydrothermal</term><term>Igneous</term><term>Igneous contacts</term><term>Ildefonse</term><term>Impedance contrast</term><term>Indian ridge</term><term>Intrusion</term><term>Iodp</term><term>Iodp expeditions</term><term>Iodp hole</term><term>Iodp site</term><term>Karson</term><term>Lateral</term><term>Lett</term><term>Lithology</term><term>Lithosphere</term><term>Lithospheric</term><term>Localized</term><term>Lower crust</term><term>Lower part</term><term>Macleod</term><term>Mafic</term><term>Magma</term><term>Magma supply</term><term>Magmatic</term><term>Magmatic accretion</term><term>Magmatism</term><term>Mantle peridotite</term><term>Massif</term><term>Mbsf</term><term>Mccaig</term><term>Metamorphism</term><term>Michibayashi</term><term>Modeling</term><term>Morb</term><term>Nozaka</term><term>Occs</term><term>Ocean drilling program</term><term>Ocean ridges</term><term>Ocean sciences</term><term>Oceanic</term><term>Oceanic core</term><term>Oceanic core complexes</term><term>Oceanic lithosphere</term><term>Olivine</term><term>Olivine gabbro</term><term>Olivine grains</term><term>Paleomagnetic</term><term>Paleomagnetic data</term><term>Peridotite</term><term>Plagioclase</term><term>Postcruise results</term><term>Rapid cooling</term><term>Refraction</term><term>Ridge</term><term>Rock type</term><term>Rock types</term><term>Schist</term><term>Schroeder</term><term>Seafloor</term><term>Seafloor mapping</term><term>Seafloor studies</term><term>Seafloor topography</term><term>Seawater</term><term>Seismic</term><term>Seismic data</term><term>Serpentinization</term><term>Serpentinized</term><term>Serpentinized harzburgite</term><term>Serpentinized peridotite</term><term>Shallow depths</term><term>Shear zone</term><term>Southern part</term><term>Southern ridge</term><term>Strain localization</term><term>Suhr</term><term>Talc</term><term>Tectonic</term><term>Tremolite</term><term>Troctolite</term><term>Troctolite intervals</term><term>Troctolites</term><term>Tucholke</term><term>Ultramafic</term><term>Ultramafic rocks</term><term>Universit</term><term>Uplift</term><term>Upper part</term><term>Velocity structure</term><term>Western shoulder</term><term>Woods hole</term><term>Zircon</term><term>Zircon ages</term><term>Zone</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Forage</term><term>Sciences de la terre</term><term>Géophysique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">Expeditions 304 and 305 of the Integrated Ocean Drilling Program cored and logged a 1.4 km section of the domal core of Atlantis Massif. Postdrilling research results summarized here constrain the structure and lithology of the Central Dome of this oceanic core complex. The dominantly gabbroic sequence recovered contrasts with predrilling predictions; application of the ground truth in subsequent geophysical processing has produced self‐consistent models for the Central Dome. The presence of many thin interfingered petrologic units indicates that the intrusions forming the domal core were emplaced over a minimum of 100–220 kyr, and not as a single magma pulse. Isotopic and mineralogical alteration is intense in the upper 100 m but decreases in intensity with depth. Below 800 m, alteration is restricted to narrow zones surrounding faults, veins, igneous contacts, and to an interval of locally intense serpentinization in olivine‐rich troctolite. Hydration of the lithosphere occurred over the complete range of temperature conditions from granulite to zeolite facies, but was predominantly in the amphibolite and greenschist range. Deformation of the sequence was remarkably localized, despite paleomagnetic indications that the dome has undergone at least 45° rotation, presumably during unroofing via detachment faulting. Both the deformation pattern and the lithology contrast with what is known from seafloor studies on the adjacent Southern Ridge of the massif. There, the detachment capping the domal core deformed a 100 m thick zone and serpentinized peridotite comprises ∼70% of recovered samples. We develop a working model of the evolution of Atlantis Massif over the past 2 Myr, outlining several stages that could explain the observed similarities and differences between the Central Dome and the Southern Ridge.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>France</li><li>Italie</li><li>Japon</li><li>Norvège</li><li>Philippines</li><li>Royaume-Uni</li><li>Suisse</li><li>États-Unis</li></country><region><li>Angleterre</li><li>Auvergne-Rhône-Alpes</li><li>Bade-Wurtemberg</li><li>Brandebourg</li><li>Californie</li><li>District de Fribourg-en-Brisgau</li><li>Languedoc-Roussillon</li><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li><li>Rhode Island</li><li>Rhône-Alpes</li><li>Région de Kantō</li><li>Texas</li><li>Yorkshire-et-Humber</li><li>Île-de-France</li></region><settlement><li>Austin (Texas)</li><li>Berkeley (Californie)</li><li>Fribourg-en-Brisgau</li><li>Houston</li><li>Leeds</li><li>Lyon</li><li>Montpellier</li><li>Paris</li><li>Potsdam</li><li>Providence (Rhode Island)</li><li>Tokyo</li><li>Toulouse</li><li>Villeurbanne</li></settlement><orgName><li>Université Brown</li><li>Université Claude Bernard Lyon 1</li><li>Université Montpellier 2</li><li>Université de Leeds</li><li>Université de Tokyo</li><li>Université du Texas à Austin</li></orgName></list><tree><country name="États-Unis"><noRegion><name sortKey="Blackman, D K" sort="Blackman, D K" uniqKey="Blackman D" first="D. 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Ishimaru</name><name sortKey="Maeda, J" sort="Maeda, J" uniqKey="Maeda J" first="J." last="Maeda">J. Maeda</name><name sortKey="Michibayashi, K" sort="Michibayashi, K" uniqKey="Michibayashi K" first="K." last="Michibayashi">K. Michibayashi</name><name sortKey="Nakagawa, T" sort="Nakagawa, T" uniqKey="Nakagawa T" first="T." last="Nakagawa">T. Nakagawa</name><name sortKey="Nozaka, T" sort="Nozaka, T" uniqKey="Nozaka T" first="T." last="Nozaka">T. Nozaka</name><name sortKey="Tamura, A" sort="Tamura, A" uniqKey="Tamura A" first="A." last="Tamura">A. Tamura</name><name sortKey="Yamasaki, T" sort="Yamasaki, T" uniqKey="Yamasaki T" first="T." last="Yamasaki">T. Yamasaki</name></country><country name="Allemagne"><noRegion><name sortKey="Abratis, M" sort="Abratis, M" uniqKey="Abratis M" first="M." last="Abratis">M. Abratis</name></noRegion><name sortKey="Rosner, M" sort="Rosner, M" uniqKey="Rosner M" first="M." last="Rosner">M. 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Mccaig</name><name sortKey="Morris, A" sort="Morris, A" uniqKey="Morris A" first="A." last="Morris">A. Morris</name><name sortKey="Searle, R C" sort="Searle, R C" uniqKey="Searle R" first="R. C." last="Searle">R. C. Searle</name></country><country name="Suisse"><noRegion><name sortKey="Fruh Reen, G" sort="Fruh Reen, G" uniqKey="Fruh Reen G" first="G." last="Früh-Green">G. Früh-Green</name></noRegion></country><country name="Australie"><noRegion><name sortKey="Halfpenny, A" sort="Halfpenny, A" uniqKey="Halfpenny A" first="A." last="Halfpenny">A. Halfpenny</name></noRegion></country><country name="Norvège"><noRegion><name sortKey="Hansen, H" sort="Hansen, H" uniqKey="Hansen H" first="H." last="Hansen">H. Hansen</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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|texte= Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid‐Atlantic Ridge 30°N
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