Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source
Abstract The Louisville Seamount Chain is a ∼4300 km long chain of submarine volcanoes in the southwestern Pacific that spans an age range comparable to that of the Hawaiian‐Emperor chain and is commonly thought to represent a hot spot track. Dredging in 2006 recovered igneous rocks from 33 stations...
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Wiley
2014-06-01
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| Series: | Geochemistry, Geophysics, Geosystems |
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| Online Access: | https://doi.org/10.1002/2014GC005288 |
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| author | Loÿc Vanderkluysen John J. Mahoney Anthony A. P. Koppers Christoph Beier Marcel Regelous Jeffrey S. Gee Peter F. Lonsdale |
| author_facet | Loÿc Vanderkluysen John J. Mahoney Anthony A. P. Koppers Christoph Beier Marcel Regelous Jeffrey S. Gee Peter F. Lonsdale |
| author_sort | Loÿc Vanderkluysen |
| collection | DOAJ |
| description | Abstract The Louisville Seamount Chain is a ∼4300 km long chain of submarine volcanoes in the southwestern Pacific that spans an age range comparable to that of the Hawaiian‐Emperor chain and is commonly thought to represent a hot spot track. Dredging in 2006 recovered igneous rocks from 33 stations on 22 seamounts covering some 49 Myr of the chain's history. All samples are alkalic, similar to previous dredge and drill samples, providing no evidence for a Hawaiian‐type tholeiitic shield‐volcano stage. Major and trace element variations appear to be predominantly controlled by small but variable extents of fractional crystallization and by partial melting. Isotopic values define only a narrow range, in agreement with a surprising long‐term source homogeneity—relative to the length scale of melting—and overlap with proposed fields for the “C” and “FOZO” mantle end‐members. Trace element and isotope geochemistry is uncorrelated with either seamount age or lithospheric thickness at the time of volcanism, except for a small number of lavas from the westernmost Louisville Seamounts built on young (<20 Ma old) oceanic crust. The Louisville hot spot has been postulated to be the source of the ∼120 Ma Ontong Java Plateau, but the Louisville isotopic signature cannot have evolved from a source with isotopic ratios like those measured for Ontong Java Plateau basalts. On the other hand, this signature can be correlated with that of samples dredged from the Danger Islands Troughs of the Manihiki Plateau, which has been interpreted as a rifted fragment of the “Greater” Ontong Java Plateau. |
| format | Article |
| id | doaj-art-8a6c35d900f8439a9eebca5a2998f7bb |
| institution | Kabale University |
| issn | 1525-2027 |
| language | English |
| publishDate | 2014-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj-art-8a6c35d900f8439a9eebca5a2998f7bb2025-08-20T03:32:04ZengWileyGeochemistry, Geophysics, Geosystems1525-20272014-06-011562380240010.1002/2014GC005288Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle sourceLoÿc Vanderkluysen0John J. Mahoney1Anthony A. P. Koppers2Christoph Beier3Marcel Regelous4Jeffrey S. Gee5Peter F. Lonsdale6School of Ocean and Earth Science and TechnologyUniversity of HawaiʻiHonolulu Hawaiʻi USASchool of Ocean and Earth Science and TechnologyUniversity of HawaiʻiHonolulu Hawaiʻi USAScripps Institution of OceanographyUniversity of CaliforniaSan Diego, La Jolla California USAGeoZentrum NordbayernUniversität Erlangen‐NürnbergErlangen GermanyGeoZentrum NordbayernUniversität Erlangen‐NürnbergErlangen GermanyScripps Institution of OceanographyUniversity of CaliforniaSan Diego, La Jolla California USAScripps Institution of OceanographyUniversity of CaliforniaSan Diego, La Jolla California USAAbstract The Louisville Seamount Chain is a ∼4300 km long chain of submarine volcanoes in the southwestern Pacific that spans an age range comparable to that of the Hawaiian‐Emperor chain and is commonly thought to represent a hot spot track. Dredging in 2006 recovered igneous rocks from 33 stations on 22 seamounts covering some 49 Myr of the chain's history. All samples are alkalic, similar to previous dredge and drill samples, providing no evidence for a Hawaiian‐type tholeiitic shield‐volcano stage. Major and trace element variations appear to be predominantly controlled by small but variable extents of fractional crystallization and by partial melting. Isotopic values define only a narrow range, in agreement with a surprising long‐term source homogeneity—relative to the length scale of melting—and overlap with proposed fields for the “C” and “FOZO” mantle end‐members. Trace element and isotope geochemistry is uncorrelated with either seamount age or lithospheric thickness at the time of volcanism, except for a small number of lavas from the westernmost Louisville Seamounts built on young (<20 Ma old) oceanic crust. The Louisville hot spot has been postulated to be the source of the ∼120 Ma Ontong Java Plateau, but the Louisville isotopic signature cannot have evolved from a source with isotopic ratios like those measured for Ontong Java Plateau basalts. On the other hand, this signature can be correlated with that of samples dredged from the Danger Islands Troughs of the Manihiki Plateau, which has been interpreted as a rifted fragment of the “Greater” Ontong Java Plateau.https://doi.org/10.1002/2014GC005288Louisvillemantle plumeshot spotocean island basaltseamountgeochemistry |
| spellingShingle | Loÿc Vanderkluysen John J. Mahoney Anthony A. P. Koppers Christoph Beier Marcel Regelous Jeffrey S. Gee Peter F. Lonsdale Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source Geochemistry, Geophysics, Geosystems Louisville mantle plumes hot spot ocean island basalt seamount geochemistry |
| title | Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source |
| title_full | Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source |
| title_fullStr | Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source |
| title_full_unstemmed | Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source |
| title_short | Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source |
| title_sort | louisville seamount chain petrogenetic processes and geochemical evolution of the mantle source |
| topic | Louisville mantle plumes hot spot ocean island basalt seamount geochemistry |
| url | https://doi.org/10.1002/2014GC005288 |
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