Asymmetric Electrical Structure in the Mantle Beneath the East Pacific Rise at 17 degrees S.
Identifieur interne : 003C31 ( PubMed/Corpus ); précédent : 003C30; suivant : 003C32Asymmetric Electrical Structure in the Mantle Beneath the East Pacific Rise at 17 degrees S.
Auteurs : Evans ; Tarits ; Chave ; White ; Heinson ; Filloux ; Toh ; Seama ; Utada ; Booker ; UnsworthSource :
- Science (New York, N.Y.) [ 1095-9203 ] ; 1999.
Abstract
The magnetotelluric component of the Mantle Electromagnetic and Tomography (MELT) Experiment measured the electrical resistivity structure of the mantle beneath the fast-spreading southern East Pacific Rise (EPR). The data reveal an asymmetric resistivity structure, with lower resistivity to the west of the ridge. The uppermost 100 kilometers of mantle immediately to the east of the ridge is consistent with a dry olivine resistivity structure indicating a mantle depleted of melt and volatiles. Mantle resistivities to the west of the ridge are consistent with a low-melt fraction (about 1 to 2 percent interconnected melt) distributed over a broad region and extending to depths of about 150 kilometers. The asymmetry in resistivity structure may be the result of asymmetric spreading rates and a westward migration of the ridge axis and suggests distinct styles of melt formation and delivery in the mantle beneath the two plates.
PubMed: 10531056
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Asymmetric Electrical Structure in the Mantle Beneath the East Pacific Rise at 17 degrees S.</title><author><name sortKey="Evans" sort="Evans" uniqKey="Evans" last="Evans">Evans</name><affiliation><nlm:affiliation>Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. UMR CNRS 6538, Universite Bretagne Occidentale, Brest, France. Flinders University, Adelaide, South Australia 5042, Australia. Scripps Institution of Oceanography, La Jolla, CA 92093, USA. Toyama University, Toyama 930-8555, Japan. Chiba University, Chiba, Japan. Earthquake Research Institute, University of Tokyo, Tokyo 113, Japan. Geophysics Program AK-50, University of Washington, Seattle, WA 98195, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Tarits" sort="Tarits" uniqKey="Tarits" last="Tarits">Tarits</name></author><author><name sortKey="Chave" sort="Chave" uniqKey="Chave" last="Chave">Chave</name></author><author><name sortKey="White" sort="White" uniqKey="White" last="White">White</name></author><author><name sortKey="Heinson" sort="Heinson" uniqKey="Heinson" last="Heinson">Heinson</name></author><author><name sortKey="Filloux" sort="Filloux" uniqKey="Filloux" last="Filloux">Filloux</name></author><author><name sortKey="Toh" sort="Toh" uniqKey="Toh" last="Toh">Toh</name></author><author><name sortKey="Seama" sort="Seama" uniqKey="Seama" last="Seama">Seama</name></author><author><name sortKey="Utada" sort="Utada" uniqKey="Utada" last="Utada">Utada</name></author><author><name sortKey="Booker" sort="Booker" uniqKey="Booker" last="Booker">Booker</name></author><author><name sortKey="Unsworth" sort="Unsworth" uniqKey="Unsworth" last="Unsworth">Unsworth</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1999">1999</date><idno type="RBID">pubmed:10531056</idno><idno type="pmid">10531056</idno><idno type="wicri:Area/PubMed/Corpus">003C31</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Corpus" wicri:corpus="PubMed">003C31</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Asymmetric Electrical Structure in the Mantle Beneath the East Pacific Rise at 17 degrees S.</title><author><name sortKey="Evans" sort="Evans" uniqKey="Evans" last="Evans">Evans</name><affiliation><nlm:affiliation>Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. UMR CNRS 6538, Universite Bretagne Occidentale, Brest, France. Flinders University, Adelaide, South Australia 5042, Australia. Scripps Institution of Oceanography, La Jolla, CA 92093, USA. Toyama University, Toyama 930-8555, Japan. Chiba University, Chiba, Japan. Earthquake Research Institute, University of Tokyo, Tokyo 113, Japan. Geophysics Program AK-50, University of Washington, Seattle, WA 98195, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Tarits" sort="Tarits" uniqKey="Tarits" last="Tarits">Tarits</name></author><author><name sortKey="Chave" sort="Chave" uniqKey="Chave" last="Chave">Chave</name></author><author><name sortKey="White" sort="White" uniqKey="White" last="White">White</name></author><author><name sortKey="Heinson" sort="Heinson" uniqKey="Heinson" last="Heinson">Heinson</name></author><author><name sortKey="Filloux" sort="Filloux" uniqKey="Filloux" last="Filloux">Filloux</name></author><author><name sortKey="Toh" sort="Toh" uniqKey="Toh" last="Toh">Toh</name></author><author><name sortKey="Seama" sort="Seama" uniqKey="Seama" last="Seama">Seama</name></author><author><name sortKey="Utada" sort="Utada" uniqKey="Utada" last="Utada">Utada</name></author><author><name sortKey="Booker" sort="Booker" uniqKey="Booker" last="Booker">Booker</name></author><author><name sortKey="Unsworth" sort="Unsworth" uniqKey="Unsworth" last="Unsworth">Unsworth</name></author></analytic><series><title level="j">Science (New York, N.Y.)</title><idno type="eISSN">1095-9203</idno><imprint><date when="1999" type="published">1999</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The magnetotelluric component of the Mantle Electromagnetic and Tomography (MELT) Experiment measured the electrical resistivity structure of the mantle beneath the fast-spreading southern East Pacific Rise (EPR). The data reveal an asymmetric resistivity structure, with lower resistivity to the west of the ridge. The uppermost 100 kilometers of mantle immediately to the east of the ridge is consistent with a dry olivine resistivity structure indicating a mantle depleted of melt and volatiles. Mantle resistivities to the west of the ridge are consistent with a low-melt fraction (about 1 to 2 percent interconnected melt) distributed over a broad region and extending to depths of about 150 kilometers. The asymmetry in resistivity structure may be the result of asymmetric spreading rates and a westward migration of the ridge axis and suggests distinct styles of melt formation and delivery in the mantle beneath the two plates.</div></front></TEI><pubmed><MedlineCitation Status="Publisher" Owner="NLM"><PMID Version="1">10531056</PMID><DateCreated><Year>1999</Year><Month>10</Month><Day>22</Day></DateCreated><DateRevised><Year>1999</Year><Month>10</Month><Day>22</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1095-9203</ISSN><JournalIssue CitedMedium="Internet"><Volume>286</Volume><Issue>5440</Issue><PubDate><Year>1999</Year><Month>Oct</Month><Day>22</Day></PubDate></JournalIssue><Title>Science (New York, N.Y.)</Title><ISOAbbreviation>Science</ISOAbbreviation></Journal><ArticleTitle>Asymmetric Electrical Structure in the Mantle Beneath the East Pacific Rise at 17 degrees S.</ArticleTitle><Pagination><MedlinePgn>752-756</MedlinePgn></Pagination><Abstract><AbstractText>The magnetotelluric component of the Mantle Electromagnetic and Tomography (MELT) Experiment measured the electrical resistivity structure of the mantle beneath the fast-spreading southern East Pacific Rise (EPR). The data reveal an asymmetric resistivity structure, with lower resistivity to the west of the ridge. The uppermost 100 kilometers of mantle immediately to the east of the ridge is consistent with a dry olivine resistivity structure indicating a mantle depleted of melt and volatiles. Mantle resistivities to the west of the ridge are consistent with a low-melt fraction (about 1 to 2 percent interconnected melt) distributed over a broad region and extending to depths of about 150 kilometers. The asymmetry in resistivity structure may be the result of asymmetric spreading rates and a westward migration of the ridge axis and suggests distinct styles of melt formation and delivery in the mantle beneath the two plates.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Evans</LastName><Initials>RL</Initials><AffiliationInfo><Affiliation>Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. UMR CNRS 6538, Universite Bretagne Occidentale, Brest, France. Flinders University, Adelaide, South Australia 5042, Australia. Scripps Institution of Oceanography, La Jolla, CA 92093, USA. Toyama University, Toyama 930-8555, Japan. Chiba University, Chiba, Japan. Earthquake Research Institute, University of Tokyo, Tokyo 113, Japan. Geophysics Program AK-50, University of Washington, Seattle, WA 98195, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Tarits</LastName><Initials>P</Initials></Author><Author ValidYN="Y"><LastName>Chave</LastName><Initials>AD</Initials></Author><Author ValidYN="Y"><LastName>White</LastName><Initials>A</Initials></Author><Author ValidYN="Y"><LastName>Heinson</LastName><Initials>G</Initials></Author><Author ValidYN="Y"><LastName>Filloux</LastName><Initials>JH</Initials></Author><Author ValidYN="Y"><LastName>Toh</LastName><Initials>H</Initials></Author><Author ValidYN="Y"><LastName>Seama</LastName><Initials>N</Initials></Author><Author ValidYN="Y"><LastName>Utada</LastName><Initials>H</Initials></Author><Author ValidYN="Y"><LastName>Booker</LastName><Initials>JR</Initials></Author><Author ValidYN="Y"><LastName>Unsworth</LastName><Initials>MJ</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Science</MedlineTA><NlmUniqueID>0404511</NlmUniqueID><ISSNLinking>0036-8075</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>1999</Year><Month>10</Month><Day>26</Day></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1999</Year><Month>10</Month><Day>26</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>1999</Year><Month>10</Month><Day>26</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">10531056</ArticleId><ArticleId IdType="pii">7908</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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