The Superswell and Mantle Dynamics Beneath the South Pacific
The region of sea floor beneath French Polynesia (the "Superswell") is anomalous in that its depth is too shallow, flexural strength too weak, seismic velocity too slow, and geoid anomaly too negative for its lithospheric age as determined from magnetic isochrons. These features evidently...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 1990-05, Vol.248 (4958), p.969-975 |
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| creator | McNutt, Marcia K. Judge, Anne V. |
| description | The region of sea floor beneath French Polynesia (the "Superswell") is anomalous in that its depth is too shallow, flexural strength too weak, seismic velocity too slow, and geoid anomaly too negative for its lithospheric age as determined from magnetic isochrons. These features evidently are the effect of excess heat and extremely low viscosity in the upper mantle that maintain a thin lithospheric plate so easily penetrated by volcanism that 30 percent of the heat flux from all hot spots is liberated in this region, which constitutes only 3 percent of the earth's surface. The low-viscosity zone may facilitate rapid plate motion and the development of small-scale convection. A possible heat supply for the Superswell is a mantle reservoir enriched in radioactive isotopes as suggested by the geochemical signature of lavas from Superswell volcanoes. |
| doi_str_mv | 10.1126/science.248.4958.969 |
| format | Article |
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These features evidently are the effect of excess heat and extremely low viscosity in the upper mantle that maintain a thin lithospheric plate so easily penetrated by volcanism that 30 percent of the heat flux from all hot spots is liberated in this region, which constitutes only 3 percent of the earth's surface. The low-viscosity zone may facilitate rapid plate motion and the development of small-scale convection. A possible heat supply for the Superswell is a mantle reservoir enriched in radioactive isotopes as suggested by the geochemical signature of lavas from Superswell volcanoes.</description><identifier>ISSN: 0036-8075</identifier><identifier>EISSN: 1095-9203</identifier><identifier>DOI: 10.1126/science.248.4958.969</identifier><identifier>PMID: 17745401</identifier><identifier>CODEN: SCIEAS</identifier><language>eng</language><publisher>United States: American Society for the Advancement of Science</publisher><subject>Analysis ; Electrical impedance ; Geoids ; Lithospheres ; Modeling ; Ocean ; Ocean bottom ; Ocean floor ; Oceanographic research ; Oceanography ; Oceans ; Phase velocity ; Temperature ; Viscosity ; Volcanoes ; Wave velocity ; Wavelengths ; Waves</subject><ispartof>Science (American Association for the Advancement of Science), 1990-05, Vol.248 (4958), p.969-975</ispartof><rights>Copyright 1990 American Association for the Advancement of Science</rights><rights>COPYRIGHT 1990 American Association for the Advancement of Science</rights><rights>COPYRIGHT 1990 American Association for the Advancement of Science</rights><rights>Copyright American Association for the Advancement of Science May 25, 1990</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a740t-8919a162b36e42d12aebee253fadab62af0e6369c653a8c0baa8f0883550d35c3</citedby><cites>FETCH-LOGICAL-a740t-8919a162b36e42d12aebee253fadab62af0e6369c653a8c0baa8f0883550d35c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/2874398$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/2874398$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,780,784,803,2884,2885,27924,27925,58017,58250</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17745401$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>McNutt, Marcia K.</creatorcontrib><creatorcontrib>Judge, Anne V.</creatorcontrib><title>The Superswell and Mantle Dynamics Beneath the South Pacific</title><title>Science (American Association for the Advancement of Science)</title><addtitle>Science</addtitle><description>The region of sea floor beneath French Polynesia (the "Superswell") is anomalous in that its depth is too shallow, flexural strength too weak, seismic velocity too slow, and geoid anomaly too negative for its lithospheric age as determined from magnetic isochrons. 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A possible heat supply for the Superswell is a mantle reservoir enriched in radioactive isotopes as suggested by the geochemical signature of lavas from Superswell volcanoes.</description><subject>Analysis</subject><subject>Electrical impedance</subject><subject>Geoids</subject><subject>Lithospheres</subject><subject>Modeling</subject><subject>Ocean</subject><subject>Ocean bottom</subject><subject>Ocean floor</subject><subject>Oceanographic research</subject><subject>Oceanography</subject><subject>Oceans</subject><subject>Phase velocity</subject><subject>Temperature</subject><subject>Viscosity</subject><subject>Volcanoes</subject><subject>Wave 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Science)</jtitle><addtitle>Science</addtitle><date>1990-05-25</date><risdate>1990</risdate><volume>248</volume><issue>4958</issue><spage>969</spage><epage>975</epage><pages>969-975</pages><issn>0036-8075</issn><eissn>1095-9203</eissn><coden>SCIEAS</coden><abstract>The region of sea floor beneath French Polynesia (the "Superswell") is anomalous in that its depth is too shallow, flexural strength too weak, seismic velocity too slow, and geoid anomaly too negative for its lithospheric age as determined from magnetic isochrons. These features evidently are the effect of excess heat and extremely low viscosity in the upper mantle that maintain a thin lithospheric plate so easily penetrated by volcanism that 30 percent of the heat flux from all hot spots is liberated in this region, which constitutes only 3 percent of the earth's surface. The low-viscosity zone may facilitate rapid plate motion and the development of small-scale convection. A possible heat supply for the Superswell is a mantle reservoir enriched in radioactive isotopes as suggested by the geochemical signature of lavas from Superswell volcanoes.</abstract><cop>United States</cop><pub>American Society for the Advancement of Science</pub><pmid>17745401</pmid><doi>10.1126/science.248.4958.969</doi><tpages>7</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0036-8075 |
| ispartof | Science (American Association for the Advancement of Science), 1990-05, Vol.248 (4958), p.969-975 |
| issn | 0036-8075 1095-9203 |
| language | eng |
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| source | American Association for the Advancement of Science; JSTOR |
| subjects | Analysis Electrical impedance Geoids Lithospheres Modeling Ocean Ocean bottom Ocean floor Oceanographic research Oceanography Oceans Phase velocity Temperature Viscosity Volcanoes Wave velocity Wavelengths Waves |
| title | The Superswell and Mantle Dynamics Beneath the South Pacific |
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