Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments
Identifieur interne : 002778 ( Istex/Corpus ); précédent : 002777; suivant : 002779Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments
Auteurs : C. R. German ; D. L. Bourlés ; E. T. Brown ; J. Hergt ; S. Colley ; N. C. Higgs ; E. M. Ludford ; T. A. Nelsen ; R. A. Feely ; G. Raisbeck ; F. YiouSource :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1997.
English descriptors
- KwdEn :
- Acta, Background samples, Biogenic, Caco3, Cleft, Cleft segment, Constant sediment accumulation, Continental eolian input, Core basis, Core depth, Cosmochim, Deeper horizon, Detrital concentration, Detrital eolian component, Distribution patterns, Distribution patterns exhibit, Earth planet, Embley, Enrichment, Excess hydrothermal component, Exhibit ratios, Feely, Fuca, Fuca ridge, Geochim, Geophys, Godfrey, Highest ratios, Hydrothermal, Hydrothermal activity, Hydrothermal discharge, Hydrothermal input, Hydrothermal plume, Hydrothermal plumes, Hydrothermal processes, Hydrothermal sediments, Isotope, Isotope concentrations, Isotope distributions, Isotope measurements, Isotopic, Isotopic composition, Isotopic compositions, Isotopic ratios, Kyte, Lett, Massoth, Metal peaks, Metalliferous sediments, More radiogenic, Nazca plate, Nonradiogenic values, Northern cleft segment, Oceanic, Overlying water column, Pacific clays, Pacific ocean, Pacific ocean values, Pacific sediments, Particle recycling, Plume, Previous work, Radiogenic, Rare earth elements, Rees, Same samples, Seawater, Sediment, Sediment accumulation rate, Sediment core, Sulfide, Unsupported activities, Upper portion, Water depth.
- Teeft :
- Acta, Background samples, Biogenic, Caco3, Cleft, Cleft segment, Constant sediment accumulation, Continental eolian input, Core basis, Core depth, Cosmochim, Deeper horizon, Detrital concentration, Detrital eolian component, Distribution patterns, Distribution patterns exhibit, Earth planet, Embley, Enrichment, Excess hydrothermal component, Exhibit ratios, Feely, Fuca, Fuca ridge, Geochim, Geophys, Godfrey, Highest ratios, Hydrothermal, Hydrothermal activity, Hydrothermal discharge, Hydrothermal input, Hydrothermal plume, Hydrothermal plumes, Hydrothermal processes, Hydrothermal sediments, Isotope, Isotope concentrations, Isotope distributions, Isotope measurements, Isotopic, Isotopic composition, Isotopic compositions, Isotopic ratios, Kyte, Lett, Massoth, Metal peaks, Metalliferous sediments, More radiogenic, Nazca plate, Nonradiogenic values, Northern cleft segment, Oceanic, Overlying water column, Pacific clays, Pacific ocean, Pacific ocean values, Pacific sediments, Particle recycling, Plume, Previous work, Radiogenic, Rare earth elements, Rees, Same samples, Seawater, Sediment, Sediment accumulation rate, Sediment core, Sulfide, Unsupported activities, Upper portion, Water depth.
Abstract
Abstract: We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO3, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported 230Thxs activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. 10Be(0) and 9Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit 10Be(o) 9Be ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. 10Be(0) 230OThxs(0) ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved 10Be into ridge-flank sediments.
Url:
DOI: 10.1016/S0016-7037(97)00230-5
Links to Exploration step
ISTEX:D4F6C8F405FC4E8881823F65EEED78541950A646Le document en format XML
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German</name><affiliation><mods:affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</mods:affiliation></affiliation></author><author><name sortKey="Bourles, D L" sort="Bourles, D L" uniqKey="Bourles D" first="D. L." last="Bourlés">D. L. Bourlés</name><affiliation><mods:affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</mods:affiliation></affiliation></author><author><name sortKey="Brown, E T" sort="Brown, E T" uniqKey="Brown E" first="E. T." last="Brown">E. T. Brown</name><affiliation><mods:affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</mods:affiliation></affiliation><affiliation><mods:affiliation>∗ Present address: Large Lakes Observatory, University of Minnesota, Minneapolis, Minnesota, USA.</mods:affiliation></affiliation></author><author><name sortKey="Hergt, J" sort="Hergt, J" uniqKey="Hergt J" first="J." last="Hergt">J. Hergt</name><affiliation><mods:affiliation>School of Earth Sciences., University of Melbourne, Parkville, Victoria, 3052, Australia</mods:affiliation></affiliation></author><author><name sortKey="Colley, S" sort="Colley, S" uniqKey="Colley S" first="S." last="Colley">S. Colley</name><affiliation><mods:affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</mods:affiliation></affiliation></author><author><name sortKey="Higgs, N C" sort="Higgs, N C" uniqKey="Higgs N" first="N. C." last="Higgs">N. C. Higgs</name><affiliation><mods:affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</mods:affiliation></affiliation></author><author><name sortKey="Ludford, E M" sort="Ludford, E M" uniqKey="Ludford E" first="E. M." last="Ludford">E. M. Ludford</name><affiliation><mods:affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</mods:affiliation></affiliation></author><author><name sortKey="Nelsen, T A" sort="Nelsen, T A" uniqKey="Nelsen T" first="T. 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input</term><term>Core basis</term><term>Core depth</term><term>Cosmochim</term><term>Deeper horizon</term><term>Detrital concentration</term><term>Detrital eolian component</term><term>Distribution patterns</term><term>Distribution patterns exhibit</term><term>Earth planet</term><term>Embley</term><term>Enrichment</term><term>Excess hydrothermal component</term><term>Exhibit ratios</term><term>Feely</term><term>Fuca</term><term>Fuca ridge</term><term>Geochim</term><term>Geophys</term><term>Godfrey</term><term>Highest ratios</term><term>Hydrothermal</term><term>Hydrothermal activity</term><term>Hydrothermal discharge</term><term>Hydrothermal input</term><term>Hydrothermal plume</term><term>Hydrothermal plumes</term><term>Hydrothermal processes</term><term>Hydrothermal sediments</term><term>Isotope</term><term>Isotope concentrations</term><term>Isotope distributions</term><term>Isotope measurements</term><term>Isotopic</term><term>Isotopic composition</term><term>Isotopic compositions</term><term>Isotopic ratios</term><term>Kyte</term><term>Lett</term><term>Massoth</term><term>Metal peaks</term><term>Metalliferous sediments</term><term>More radiogenic</term><term>Nazca plate</term><term>Nonradiogenic values</term><term>Northern cleft segment</term><term>Oceanic</term><term>Overlying water column</term><term>Pacific clays</term><term>Pacific ocean</term><term>Pacific ocean values</term><term>Pacific sediments</term><term>Particle recycling</term><term>Plume</term><term>Previous work</term><term>Radiogenic</term><term>Rare earth elements</term><term>Rees</term><term>Same samples</term><term>Seawater</term><term>Sediment</term><term>Sediment accumulation rate</term><term>Sediment core</term><term>Sulfide</term><term>Unsupported activities</term><term>Upper portion</term><term>Water depth</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Acta</term><term>Background samples</term><term>Biogenic</term><term>Caco3</term><term>Cleft</term><term>Cleft segment</term><term>Constant sediment accumulation</term><term>Continental eolian input</term><term>Core basis</term><term>Core depth</term><term>Cosmochim</term><term>Deeper horizon</term><term>Detrital concentration</term><term>Detrital eolian component</term><term>Distribution patterns</term><term>Distribution patterns exhibit</term><term>Earth planet</term><term>Embley</term><term>Enrichment</term><term>Excess hydrothermal component</term><term>Exhibit ratios</term><term>Feely</term><term>Fuca</term><term>Fuca ridge</term><term>Geochim</term><term>Geophys</term><term>Godfrey</term><term>Highest ratios</term><term>Hydrothermal</term><term>Hydrothermal activity</term><term>Hydrothermal discharge</term><term>Hydrothermal input</term><term>Hydrothermal plume</term><term>Hydrothermal plumes</term><term>Hydrothermal processes</term><term>Hydrothermal sediments</term><term>Isotope</term><term>Isotope 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depth</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO3, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported 230Thxs activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. 10Be(0) and 9Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit 10Be(o) 9Be ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. 10Be(0) 230OThxs(0) ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved 10Be into ridge-flank sediments.</div></front></TEI><istex><corpusName>elsevier</corpusName><keywords><teeft><json:string>hydrothermal</json:string><json:string>fuca</json:string><json:string>fuca ridge</json:string><json:string>isotope</json:string><json:string>earth planet</json:string><json:string>lett</json:string><json:string>caco3</json:string><json:string>feely</json:string><json:string>seawater</json:string><json:string>radiogenic</json:string><json:string>sediment</json:string><json:string>geophys</json:string><json:string>acta</json:string><json:string>massoth</json:string><json:string>geochim</json:string><json:string>biogenic</json:string><json:string>hydrothermal input</json:string><json:string>embley</json:string><json:string>cosmochim</json:string><json:string>oceanic</json:string><json:string>kyte</json:string><json:string>plume</json:string><json:string>pacific ocean</json:string><json:string>hydrothermal plumes</json:string><json:string>isotopic compositions</json:string><json:string>overlying water column</json:string><json:string>hydrothermal plume</json:string><json:string>distribution patterns</json:string><json:string>cleft segment</json:string><json:string>metalliferous sediments</json:string><json:string>isotopic</json:string><json:string>godfrey</json:string><json:string>sulfide</json:string><json:string>isotopic composition</json:string><json:string>isotope distributions</json:string><json:string>excess hydrothermal component</json:string><json:string>core depth</json:string><json:string>deeper horizon</json:string><json:string>northern cleft segment</json:string><json:string>hydrothermal processes</json:string><json:string>upper portion</json:string><json:string>enrichment</json:string><json:string>hydrothermal sediments</json:string><json:string>pacific ocean values</json:string><json:string>nonradiogenic values</json:string><json:string>distribution patterns exhibit</json:string><json:string>pacific clays</json:string><json:string>pacific sediments</json:string><json:string>unsupported activities</json:string><json:string>more radiogenic</json:string><json:string>nazca plate</json:string><json:string>continental eolian input</json:string><json:string>isotopic ratios</json:string><json:string>background samples</json:string><json:string>same samples</json:string><json:string>hydrothermal discharge</json:string><json:string>hydrothermal activity</json:string><json:string>detrital eolian component</json:string><json:string>detrital concentration</json:string><json:string>water depth</json:string><json:string>highest ratios</json:string><json:string>constant sediment accumulation</json:string><json:string>previous work</json:string><json:string>sediment accumulation rate</json:string><json:string>particle recycling</json:string><json:string>sediment core</json:string><json:string>rare earth elements</json:string><json:string>isotope concentrations</json:string><json:string>core basis</json:string><json:string>exhibit ratios</json:string><json:string>metal peaks</json:string><json:string>isotope measurements</json:string><json:string>cleft</json:string><json:string>rees</json:string></teeft></keywords><author><json:item><name>C.R. German</name><affiliations><json:string>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</json:string></affiliations></json:item><json:item><name>D.L. Bourlés</name><affiliations><json:string>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</json:string></affiliations></json:item><json:item><name>E.T. Brown</name><affiliations><json:string>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</json:string><json:string>∗ Present address: Large Lakes Observatory, University of Minnesota, Minneapolis, Minnesota, USA.</json:string></affiliations></json:item><json:item><name>J. Hergt</name><affiliations><json:string>School of Earth Sciences., University of Melbourne, Parkville, Victoria, 3052, Australia</json:string></affiliations></json:item><json:item><name>S. Colley</name><affiliations><json:string>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</json:string></affiliations></json:item><json:item><name>N.C. Higgs</name><affiliations><json:string>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</json:string></affiliations></json:item><json:item><name>E.M. Ludford</name><affiliations><json:string>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</json:string></affiliations></json:item><json:item><name>T.A. Nelsen</name><affiliations><json:string>NOAA-AOML, Rickenbacker Causeway, Miami, Florida 33149, USA</json:string></affiliations></json:item><json:item><name>R.A. Feely</name><affiliations><json:string>NOAA-PMEL, 7600 Sand Point Way NE, Seattle, Washington 98115, USA</json:string></affiliations></json:item><json:item><name>G. Raisbeck</name><affiliations><json:string>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</json:string></affiliations></json:item><json:item><name>F. Yiou</name><affiliations><json:string>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</json:string></affiliations></json:item></author><arkIstex>ark:/67375/6H6-83HVDZZP-R</arkIstex><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>Abstract: We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO3, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported 230Thxs activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. 10Be(0) and 9Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit 10Be(o) 9Be ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. 10Be(0) 230OThxs(0) ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved 10Be into ridge-flank sediments.</abstract><qualityIndicators><refBibsNative>true</refBibsNative><abstractWordCount>194</abstractWordCount><abstractCharCount>1423</abstractCharCount><keywordCount>0</keywordCount><score>9.328</score><pdfWordCount>6926</pdfWordCount><pdfCharCount>42582</pdfCharCount><pdfVersion>1.2</pdfVersion><pdfPageCount>12</pdfPageCount><pdfPageSize>584 x 792 pts</pdfPageSize></qualityIndicators><title>Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments</title><pii><json:string>S0016-7037(97)00230-5</json:string></pii><genre><json:string>research-article</json:string></genre><serie><title>PhD thesis</title><language><json:string>unknown</json:string></language></serie><host><title>Geochimica et Cosmochimica Acta</title><language><json:string>unknown</json:string></language><publicationDate>1997</publicationDate><issn><json:string>0016-7037</json:string></issn><pii><json:string>S0016-7037(00)X0050-6</json:string></pii><volume>61</volume><issue>19</issue><pages><first>4067</first><last>4078</last></pages><genre><json:string>journal</json:string></genre></host><namedEntities><unitex><date><json:string>1997</json:string><json:string>1986</json:string></date><geogName></geogName><orgName><json:string>University of Minnesota</json:string><json:string>Elsevier Science Ltd</json:string><json:string>Community Research Project</json:string></orgName><orgName_funder></orgName_funder><orgName_provider></orgName_provider><persName><json:string>J. Thomson</json:string><json:string>R. F. Anderson</json:string><json:string>Pacific Ocean</json:string><json:string>D. Deboffle</json:string><json:string>Pacific Rise</json:string><json:string>J. Lestringuez</json:string><json:string>MAT Finnigan</json:string></persName><placeName><json:string>Minneapolis</json:string><json:string>Southampton</json:string><json:string>Miami</json:string><json:string>Australia</json:string><json:string>UK</json:string><json:string>Melbourne</json:string><json:string>Seattle</json:string><json:string>Gif-sur-Yvette</json:string><json:string>France</json:string></placeName><ref_url></ref_url><ref_bibl><json:string>Stacey and Kramers (1975)</json:string><json:string>C. R. German et al. 4070</json:string><json:string>Barrett et al., 1987</json:string><json:string>Kyte et al. (1993)</json:string><json:string>Klinkhammer and Hudson, 1986</json:string><json:string>data from Hegner and Tatsumoto, 1987</json:string><json:string>German et al. (1995)</json:string><json:string>Kyte et al., 1993</json:string><json:string>Hegner and Tatsumoto, 1987</json:string><json:string>Received December 19, 1996</json:string><json:string>German and Sparks (1993)</json:string><json:string>similar to previously reported basalts and hydrothermal sulfides from the southern JdFR; Hegner and Tatsumoto, 1987</json:string><json:string>Godfrey et al., 1994</json:string><json:string>Embley et al. (1994)</json:string><json:string>Kusakabe et al., 1987</json:string><json:string>Woodhead et al. (1994)</json:string><json:string>Olivarez and Owen (1989)</json:string><json:string>Feely et al., 1990</json:string><json:string>Jarvis and Jarvis (1985, 1988)</json:string><json:string>German et al., 1991b</json:string><json:string>Embley and Chadwick, 1994</json:string><json:string>Barrett et al. (1987)</json:string><json:string>Chen et al., 1986</json:string><json:string>Baker et al., 1989</json:string><json:string>Chen, 1987</json:string><json:string>Mottl and McConachy, 1990</json:string><json:string>Reynolds and Dasch (1971)</json:string><json:string>Kadko, 1980</json:string><json:string>Bourlbs et al. (1989)</json:string><json:string>Taylor and McLennan (1985)</json:string><json:string>Vidal and Clauer, 1981</json:string><json:string>Godfrey, 1990</json:string><json:string>German et al. (1991a)</json:string><json:string>Dasch, 1981</json:string><json:string>C.R. German et al.</json:string><json:string>Bourlbs et al., 1994</json:string><json:string>1 5 - 2 5 × 108 at/g; Frank et a l , 1994</json:string><json:string>Feely et al. (1992, 1994)</json:string><json:string>Grundmanis and Murray, 1982</json:string><json:string>Monaghan et al, 1986</json:string><json:string>Anderson et al, 1983a,b</json:string><json:string>Anderson et al., 1990</json:string><json:string>Feely et al., 1987</json:string><json:string>Baker et al., 1987</json:string><json:string>Olivarez and Owen, 1989</json:string><json:string>German et al. 1990, 1991a</json:string><json:string>Massoth et al., 1994</json:string><json:string>Anderson et al. (1990)</json:string><json:string>accepted in revisedform May 27, 1997</json:string><json:string>Lao et al., 1992</json:string><json:string>German et al., 1990</json:string><json:string>Bacon, 1988</json:string><json:string>German et al., 1990, 1991a,b</json:string></ref_bibl><bibl></bibl></unitex></namedEntities><ark><json:string>ark:/67375/6H6-83HVDZZP-R</json:string></ark><categories><wos><json:string>1 - science</json:string><json:string>2 - geochemistry & geophysics</json:string></wos><scienceMetrix><json:string>1 - natural sciences</json:string><json:string>2 - earth & environmental sciences</json:string><json:string>3 - geochemistry & geophysics</json:string></scienceMetrix><scopus><json:string>1 - Physical Sciences</json:string><json:string>2 - Earth and Planetary Sciences</json:string><json:string>3 - Geochemistry and Petrology</json:string></scopus><inist><json:string>1 - sciences appliquees, technologies et medecines</json:string><json:string>2 - sciences exactes et technologie</json:string><json:string>3 - terre, ocean, espace</json:string><json:string>4 - geophysique externe</json:string></inist></categories><publicationDate>1997</publicationDate><copyrightDate>1997</copyrightDate><doi><json:string>10.1016/S0016-7037(97)00230-5</json:string></doi><id>D4F6C8F405FC4E8881823F65EEED78541950A646</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/D4F6C8F405FC4E8881823F65EEED78541950A646/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/D4F6C8F405FC4E8881823F65EEED78541950A646/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/D4F6C8F405FC4E8881823F65EEED78541950A646/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1997</date></publicationStmt><notesStmt><note type="content">Section title: Article</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments</title><author xml:id="author-0000"><persName><forename type="first">C.R.</forename><surname>German</surname></persName><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation></author><author xml:id="author-0001"><persName><forename type="first">D.L.</forename><surname>Bourlés</surname></persName><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation></author><author xml:id="author-0002"><persName><forename type="first">E.T.</forename><surname>Brown</surname></persName><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation><affiliation>∗ Present address: Large Lakes Observatory, University of Minnesota, Minneapolis, Minnesota, USA.</affiliation></author><author xml:id="author-0003"><persName><forename type="first">J.</forename><surname>Hergt</surname></persName><affiliation>School of Earth Sciences., University of Melbourne, Parkville, Victoria, 3052, Australia</affiliation></author><author xml:id="author-0004"><persName><forename type="first">S.</forename><surname>Colley</surname></persName><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation></author><author xml:id="author-0005"><persName><forename type="first">N.C.</forename><surname>Higgs</surname></persName><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation></author><author xml:id="author-0006"><persName><forename type="first">E.M.</forename><surname>Ludford</surname></persName><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation></author><author xml:id="author-0007"><persName><forename type="first">T.A.</forename><surname>Nelsen</surname></persName><affiliation>NOAA-AOML, Rickenbacker Causeway, Miami, Florida 33149, USA</affiliation></author><author xml:id="author-0008"><persName><forename type="first">R.A.</forename><surname>Feely</surname></persName><affiliation>NOAA-PMEL, 7600 Sand Point Way NE, Seattle, Washington 98115, USA</affiliation></author><author xml:id="author-0009"><persName><forename type="first">G.</forename><surname>Raisbeck</surname></persName><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation></author><author xml:id="author-0010"><persName><forename type="first">F.</forename><surname>Yiou</surname></persName><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation></author><idno type="istex">D4F6C8F405FC4E8881823F65EEED78541950A646</idno><idno type="DOI">10.1016/S0016-7037(97)00230-5</idno><idno type="PII">S0016-7037(97)00230-5</idno></analytic><monogr><title level="j">Geochimica et Cosmochimica Acta</title><title level="j" type="abbrev">GCA</title><idno type="pISSN">0016-7037</idno><idno type="PII">S0016-7037(00)X0050-6</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997"></date><biblScope unit="volume">61</biblScope><biblScope unit="issue">19</biblScope><biblScope unit="page" from="4067">4067</biblScope><biblScope unit="page" to="4078">4078</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1997</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO3, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported 230Thxs activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. 10Be(0) and 9Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit 10Be(o) 9Be ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. 10Be(0) 230OThxs(0) ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved 10Be into ridge-flank sediments.</p></abstract></profileDesc><revisionDesc><change when="1997">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/D4F6C8F405FC4E8881823F65EEED78541950A646/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>GCA</jid><aid>97002305</aid><ce:pii>S0016-7037(97)00230-5</ce:pii><ce:doi>10.1016/S0016-7037(97)00230-5</ce:doi><ce:copyright type="unknown" year="1997"></ce:copyright></item-info><head><ce:dochead><ce:textfn>Article</ce:textfn></ce:dochead><ce:title>Hydrothermal scavenging on the Juan de Fuca Ridge: <ce:sup>23O</ce:sup>Th<ce:inf>xs</ce:inf>, <ce:sup loc="pre">10</ce:sup>Be, and REEs in ridge-flank sediments</ce:title><ce:author-group><ce:author><ce:given-name>C.R.</ce:given-name><ce:surname>German</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>D.L.</ce:given-name><ce:surname>Bourlés</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>E.T.</ce:given-name><ce:surname>Brown</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref><ce:cross-ref refid="FN1"><ce:sup>∗</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>J.</ce:given-name><ce:surname>Hergt</ce:surname><ce:cross-ref refid="AFF3"><ce:sup>3</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>S.</ce:given-name><ce:surname>Colley</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>N.C.</ce:given-name><ce:surname>Higgs</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>E.M.</ce:given-name><ce:surname>Ludford</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>T.A.</ce:given-name><ce:surname>Nelsen</ce:surname><ce:cross-ref refid="AFF4"><ce:sup>4</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>R.A.</ce:given-name><ce:surname>Feely</ce:surname><ce:cross-ref refid="AFF5"><ce:sup>5</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>G.</ce:given-name><ce:surname>Raisbeck</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>F.</ce:given-name><ce:surname>Yiou</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>a</ce:label><ce:textfn>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>b</ce:label><ce:textfn>CSNSM, CNRS-IN<ce:inf>2</ce:inf>P<ce:inf>3</ce:inf>, Bâtiment 108, Campus Orsay, France</ce:textfn></ce:affiliation><ce:affiliation id="AFF3"><ce:label>c</ce:label><ce:textfn>School of Earth Sciences., University of Melbourne, Parkville, Victoria, 3052, Australia</ce:textfn></ce:affiliation><ce:affiliation id="AFF4"><ce:label>d</ce:label><ce:textfn>NOAA-AOML, Rickenbacker Causeway, Miami, Florida 33149, USA</ce:textfn></ce:affiliation><ce:affiliation id="AFF5"><ce:label>e</ce:label><ce:textfn>NOAA-PMEL, 7600 Sand Point Way NE, Seattle, Washington 98115, USA</ce:textfn></ce:affiliation><ce:footnote id="FN1"><ce:label>∗</ce:label><ce:note-para>Present address: Large Lakes Observatory, University of Minnesota, Minneapolis, Minnesota, USA.</ce:note-para></ce:footnote></ce:author-group><ce:date-received day="19" month="12" year="1996"></ce:date-received><ce:date-accepted day="27" month="5" year="1997"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO<ce:inf>3</ce:inf>, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported <ce:sup loc="pre">230</ce:sup>Th<ce:inf>xs</ce:inf> activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. <ce:sup loc="pre">10</ce:sup>Be<ce:inf>(0)</ce:inf> and <ce:sup>9</ce:sup>Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit <math altimg="si1.gif"><fr shape="sol"><nu><sup>10</sup><rm>Be</rm><inf>(o)</inf></nu><de><sup>9</sup><rm>Be</rm></de></fr></math> ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. <math altimg="si2.gif"><fr shape="sol"><nu><sup>10</sup><rm>Be</rm><inf>(0)</inf></nu><de><sup>230</sup><rm>OTh</rm><inf><rm>xs</rm>(0)</inf></de></fr></math> ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved <ce:sup loc="pre">10</ce:sup>Be into ridge-flank sediments.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Hydrothermal scavenging on the Juan de Fuca Ridge:</title></titleInfo><name type="personal"><namePart type="given">C.R.</namePart><namePart type="family">German</namePart><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D.L.</namePart><namePart type="family">Bourlés</namePart><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">E.T.</namePart><namePart type="family">Brown</namePart><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation><affiliation>∗ Present address: Large Lakes Observatory, University of Minnesota, Minneapolis, Minnesota, USA.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Hergt</namePart><affiliation>School of Earth Sciences., University of Melbourne, Parkville, Victoria, 3052, Australia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.</namePart><namePart type="family">Colley</namePart><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">N.C.</namePart><namePart type="family">Higgs</namePart><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">E.M.</namePart><namePart type="family">Ludford</namePart><affiliation>Southampton Oceanography Centre, Southampton SO14 3ZH, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">T.A.</namePart><namePart type="family">Nelsen</namePart><affiliation>NOAA-AOML, Rickenbacker Causeway, Miami, Florida 33149, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R.A.</namePart><namePart type="family">Feely</namePart><affiliation>NOAA-PMEL, 7600 Sand Point Way NE, Seattle, Washington 98115, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">G.</namePart><namePart type="family">Raisbeck</namePart><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">F.</namePart><namePart type="family">Yiou</namePart><affiliation>CSNSM, CNRS-IN2P3, Bâtiment 108, Campus Orsay, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1997</dateIssued><copyrightDate encoding="w3cdtf">1997</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><abstract lang="en">Abstract: We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO3, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported 230Thxs activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. 10Be(0) and 9Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit 10Be(o) 9Be ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. 10Be(0) 230OThxs(0) ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved 10Be into ridge-flank sediments.</abstract><note type="content">Section title: Article</note><relatedItem type="host"><titleInfo><title>Geochimica et Cosmochimica Acta</title></titleInfo><titleInfo type="abbreviated"><title>GCA</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">199710</dateIssued></originInfo><identifier type="ISSN">0016-7037</identifier><identifier type="PII">S0016-7037(00)X0050-6</identifier><part><date>199710</date><detail type="volume"><number>61</number><caption>vol.</caption></detail><detail type="issue"><number>19</number><caption>no.</caption></detail><extent unit="issue-pages"><start>4017</start><end>4244</end></extent><extent unit="pages"><start>4067</start><end>4078</end></extent></part></relatedItem><identifier type="istex">D4F6C8F405FC4E8881823F65EEED78541950A646</identifier><identifier type="ark">ark:/67375/6H6-83HVDZZP-R</identifier><identifier type="DOI">10.1016/S0016-7037(97)00230-5</identifier><identifier type="PII">S0016-7037(97)00230-5</identifier><recordInfo><recordContentSource authority="ISTEX" authorityURI="https://loaded-corpus.data.istex.fr" valueURI="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-HKKZVM7B-M">elsevier</recordContentSource></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/document/D4F6C8F405FC4E8881823F65EEED78541950A646/metadata/json</uri></json:item></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
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|texte= Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments
}}
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