Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion
Identifieur interne : 000646 ( Istex/Corpus ); précédent : 000645; suivant : 000647Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion
Auteurs : F. Wobbe ; K. Gohl ; A. Chambord ; R. SutherlandSource :
- Geochemistry, Geophysics, Geosystems [ 1525-2027 ] ; 2012-04.
Abstract
Geophysical data acquired using R/V Polarstern constrain the structure and age of the rifted oceanic margin of West Antarctica. West of the Antipodes Fracture Zone, the 145 km wide continent–ocean transition zone (COTZ) of the Marie Byrd Land sector resembles a typical magma‐poor margin. New gravity and seismic reflection data indicates initial continental crust of thickness 24 km, that was stretched 90 km. Farther east, the Bellingshausen sector is broad and complex with abundant evidence for volcanism, the COTZ is ∼670 km wide, and the nature of crust within the COTZ is uncertain. Margin extension is estimated to be 106–304 km in this sector. Seafloor magnetic anomalies adjacent to Marie Byrd Land near the Pahemo Fracture Zone indicate full‐spreading rate during c33–c31 (80–68 Myr) of 60 mm yr−1, increasing to 74 mm yr−1 at c27 (62 Myr), and then dropping to 22 mm yr−1 by c22 (50 Myr). Spreading rates were lower to the west. Extrapolation towards the continental margin indicates initial oceanic crust formation at around c34y (84 Myr). Subsequent motion of the Bellingshausen plate relative to Antarctica (84–62 Myr) took place east of the Antipodes Fracture Zone at rates <40 mm yr−1, typically 5–20 mm yr−1. The high extension rate of 30–60 mm yr−1 during initial margin formation is consistent with steep and symmetrical margin morphology, but subsequent motion of the Bellingshausen plate was slow and complex, and modified rift morphology through migrating deformation and volcanic centers to create a broad and complex COTZ.
Url:
DOI: 10.1029/2011GC003742
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West of the Antipodes Fracture Zone, the 145 km wide continent–ocean transition zone (COTZ) of the Marie Byrd Land sector resembles a typical magma‐poor margin. New gravity and seismic reflection data indicates initial continental crust of thickness 24 km, that was stretched 90 km. Farther east, the Bellingshausen sector is broad and complex with abundant evidence for volcanism, the COTZ is ∼670 km wide, and the nature of crust within the COTZ is uncertain. Margin extension is estimated to be 106–304 km in this sector. Seafloor magnetic anomalies adjacent to Marie Byrd Land near the Pahemo Fracture Zone indicate full‐spreading rate during c33–c31 (80–68 Myr) of 60 mm yr−1, increasing to 74 mm yr−1 at c27 (62 Myr), and then dropping to 22 mm yr−1 by c22 (50 Myr). Spreading rates were lower to the west. Extrapolation towards the continental margin indicates initial oceanic crust formation at around c34y (84 Myr). Subsequent motion of the Bellingshausen plate relative to Antarctica (84–62 Myr) took place east of the Antipodes Fracture Zone at rates <40 mm yr−1, typically 5–20 mm yr−1. The high extension rate of 30–60 mm yr−1 during initial margin formation is consistent with steep and symmetrical margin morphology, but subsequent motion of the Bellingshausen plate was slow and complex, and modified rift morphology through migrating deformation and volcanic centers to create a broad and complex COTZ.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>F. Wobbe</name><affiliations><json:string>Alfred Wegener Institute for Polar and Marine Research, PO Box 120161, D-27515 Bremerhaven, Germany</json:string><json:string>E-mail: fwobbe@awi.de</json:string></affiliations></json:item><json:item><name>K. 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Subsequent motion of the Bellingshausen plate relative to Antarctica (84–62 Myr) took place east of the Antipodes Fracture Zone at rates <40 mm yr−1, typically 5–20 mm yr−1. The high extension rate of 30–60 mm yr−1 during initial margin formation is consistent with steep and symmetrical margin morphology, but subsequent motion of the Bellingshausen plate was slow and complex, and modified rift morphology through migrating deformation and volcanic centers to create a broad and complex COTZ.</p></abstract><abstract style="short"><p>High‐resolution aeromagnetic data acquired in a previously unsurveyed area Models of continental margin crust constrained by seismic and gravity data Plate‐tectonic reconstruction considering continental deformation during breakup</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>continent–ocean transition zone</term></item><item><term>crustal thickness</term></item><item><term>magnetic spreading anomaly</term></item><item><term>plate reconstruction</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>Plate Reconstructions, Mantle Convection, and Tomography Models: A Complementary Vision of Earth's Interior</term></item><item><term>GEODESY AND GRAVITY</term></item><item><term>Earth's interior: composition and state</term></item><item><term>GEOMAGNETISM AND PALEOMAGNETISM</term></item><item><term>Magnetic anomalies: modeling and interpretation</term></item><item><term>MARINE GEOLOGY AND GEOPHYSICS</term></item><item><term>Plate tectonics</term></item><item><term>TECTONOPHYSICS</term></item><item><term>Continental margins: divergent</term></item><item><term>Plate motions: past</term></item><item><term>Earth's interior: composition and state</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2011-06-06">Received</change><change when="2012-03-09">Registration</change><change when="2012-04">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/E685B37AB861477661F6A0DC5BDBC182AD5E51C5/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component type="serialArticle" version="2.0" xml:lang="en" xml:id="ggge2057"><header><publicationMeta level="product"><doi>10.1002/(ISSN)1525-2027</doi><issn type="print">1525-2027</issn><issn type="electronic">1525-2027</issn><idGroup><id type="product" value="GGGE"></id><id type="coden" value="GGGGFR"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS">Geochemistry, Geophysics, Geosystems</title><title type="short">Geochem. 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To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac).</p><p xml:id="ggge2057-para-0003">Additional file information is provided in the readme.txt.</p><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:15252027:media:ggge2057:ggge2057-sup-0001-readme"></mediaResource><caption>readme.txt</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="application/zip" href="urn-x:wiley:15252027:media:ggge2057:ggge2057-sup-0002-txts01"></mediaResource><caption>Text S1. Additional data, figures, and animations.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:15252027:media:ggge2057:ggge2057-sup-0003-t01"></mediaResource><caption>Tab‐delimited Table 1.</caption></supportingInfoItem></supportingInformation><abstractGroup><abstract type="main"><p xml:id="ggge2057-para-0004" label="1">Geophysical data acquired using R/V Polarstern constrain the structure and age of the rifted oceanic margin of West Antarctica. West of the Antipodes Fracture Zone, the 145 km wide continent–ocean transition zone (COTZ) of the Marie Byrd Land sector resembles a typical magma‐poor margin. New gravity and seismic reflection data indicates initial continental crust of thickness 24 km, that was stretched 90 km. Farther east, the Bellingshausen sector is broad and complex with abundant evidence for volcanism, the COTZ is ∼670 km wide, and the nature of crust within the COTZ is uncertain. Margin extension is estimated to be 106–304 km in this sector. Seafloor magnetic anomalies adjacent to Marie Byrd Land near the Pahemo Fracture Zone indicate full‐spreading rate during c33–c31 (80–68 Myr) of 60 mm yr<sup>−1</sup>, increasing to 74 mm yr<sup>−1</sup> at c27 (62 Myr), and then dropping to 22 mm yr<sup>−1</sup> by c22 (50 Myr). Spreading rates were lower to the west. Extrapolation towards the continental margin indicates initial oceanic crust formation at around c34y (84 Myr). Subsequent motion of the Bellingshausen plate relative to Antarctica (84–62 Myr) took place east of the Antipodes Fracture Zone at rates <40 mm yr<sup>−1</sup>, typically 5–20 mm yr<sup>−1</sup>. The high extension rate of 30–60 mm yr<sup>−1</sup> during initial margin formation is consistent with steep and symmetrical margin morphology, but subsequent motion of the Bellingshausen plate was slow and complex, and modified rift morphology through migrating deformation and volcanic centers to create a broad and complex COTZ.</p></abstract><abstract type="short"><title type="main">Key Points</title><p xml:id="ggge2057-para-0005"><list style="bulleted"><listItem>High‐resolution aeromagnetic data acquired in a previously unsurveyed area</listItem><listItem>Models of continental margin crust constrained by seismic and gravity data</listItem><listItem>Plate‐tectonic reconstruction considering continental deformation during breakup</listItem></list></p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>BREAKUP HISTORY OF ZEALANDIA–MARIE BYRD LAND</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion</title></titleInfo><name type="personal"><namePart type="given">F.</namePart><namePart type="family">Wobbe</namePart><affiliation>Alfred Wegener Institute for Polar and Marine Research, PO Box 120161, D-27515 Bremerhaven, Germany</affiliation><affiliation>E-mail: fwobbe@awi.de</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K.</namePart><namePart type="family">Gohl</namePart><affiliation>Alfred Wegener Institute for Polar and Marine Research, PO Box 120161, D-27515 Bremerhaven, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Chambord</namePart><affiliation>GNS Science, 1 Fairview Drive, Lower Hutt 5040, New Zealand</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R.</namePart><namePart type="family">Sutherland</namePart><affiliation>GNS Science, 1 Fairview Drive, Lower Hutt 5040, New Zealand</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">2012-04</dateIssued><dateCaptured encoding="w3cdtf">2011-06-06</dateCaptured><dateValid encoding="w3cdtf">2012-03-09</dateValid><edition>Wobbe, F., K. Gohl, A. Chambord, and R. Sutherland (2012), Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion, Geochem. Geophys. Geosyst., 13, Q04W12, doi:10.1029/2011GC003742.</edition><copyrightDate encoding="w3cdtf">2012</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">9</extent><extent unit="tables">1</extent><extent unit="words">11300</extent></physicalDescription><abstract>Geophysical data acquired using R/V Polarstern constrain the structure and age of the rifted oceanic margin of West Antarctica. West of the Antipodes Fracture Zone, the 145 km wide continent–ocean transition zone (COTZ) of the Marie Byrd Land sector resembles a typical magma‐poor margin. New gravity and seismic reflection data indicates initial continental crust of thickness 24 km, that was stretched 90 km. Farther east, the Bellingshausen sector is broad and complex with abundant evidence for volcanism, the COTZ is ∼670 km wide, and the nature of crust within the COTZ is uncertain. Margin extension is estimated to be 106–304 km in this sector. Seafloor magnetic anomalies adjacent to Marie Byrd Land near the Pahemo Fracture Zone indicate full‐spreading rate during c33–c31 (80–68 Myr) of 60 mm yr−1, increasing to 74 mm yr−1 at c27 (62 Myr), and then dropping to 22 mm yr−1 by c22 (50 Myr). Spreading rates were lower to the west. Extrapolation towards the continental margin indicates initial oceanic crust formation at around c34y (84 Myr). Subsequent motion of the Bellingshausen plate relative to Antarctica (84–62 Myr) took place east of the Antipodes Fracture Zone at rates <40 mm yr−1, typically 5–20 mm yr−1. The high extension rate of 30–60 mm yr−1 during initial margin formation is consistent with steep and symmetrical margin morphology, but subsequent motion of the Bellingshausen plate was slow and complex, and modified rift morphology through migrating deformation and volcanic centers to create a broad and complex COTZ.</abstract><abstract type="short">High‐resolution aeromagnetic data acquired in a previously unsurveyed area Models of continental margin crust constrained by seismic and gravity data Plate‐tectonic reconstruction considering continental deformation during breakup</abstract><subject><genre>keywords</genre><topic>continent–ocean transition zone</topic><topic>crustal thickness</topic><topic>magnetic spreading anomaly</topic><topic>plate reconstruction</topic></subject><relatedItem type="host"><titleInfo><title>Geochemistry, Geophysics, Geosystems</title></titleInfo><titleInfo type="abbreviated"><title>Geochem. Geophys. Geosyst.</title></titleInfo><genre type="journal">journal</genre><note type="content"> Auxiliary material for this article contains one zip file containing additional data, figures, and animations. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). Additional file information is provided in the readme.txt. Auxiliary material for this article contains one zip file containing additional data, figures, and animations. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). Additional file information is provided in the readme.txt. Auxiliary material for this article contains one zip file containing additional data, figures, and animations. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). Additional file information is provided in the readme.txt.Supporting Info Item: readme.txt - Text S1. Additional data, figures, and animations. - Tab‐delimited Table 1. - </note><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/specialSection/TOMOGRAPH1">Plate Reconstructions, Mantle Convection, and Tomography Models: A Complementary Vision of Earth's Interior</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1200">GEODESY AND GRAVITY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1212">Earth's interior: composition and state</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1500">GEOMAGNETISM AND PALEOMAGNETISM</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1517">Magnetic anomalies: modeling and interpretation</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3000">MARINE GEOLOGY AND GEOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3040">Plate tectonics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8105">Continental margins: divergent</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8157">Plate motions: past</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8124">Earth's interior: composition and state</topic></subject><identifier type="ISSN">1525-2027</identifier><identifier type="eISSN">1525-2027</identifier><identifier type="DOI">10.1002/(ISSN)1525-2027</identifier><identifier type="CODEN">GGGGFR</identifier><identifier type="PublisherID">GGGE</identifier><part><date>2012</date><detail type="volume"><caption>vol.</caption><number>13</number></detail><detail type="issue"><caption>no.</caption><number>4</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>19</total></extent></part></relatedItem><identifier type="istex">E685B37AB861477661F6A0DC5BDBC182AD5E51C5</identifier><identifier type="DOI">10.1029/2011GC003742</identifier><identifier type="ArticleID">2011GC003742</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2012 by the American Geophysical Union</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><enrichments><json:item><type>multicat</type><uri>https://api.istex.fr/document/E685B37AB861477661F6A0DC5BDBC182AD5E51C5/enrichments/multicat</uri></json:item></enrichments><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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