Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas
International audience This study presents an extensive geochemical data set of 23 samples from St. Barthélemy Island, which belongs to the extinct branch of the Lesser Antilles arc and is currently exposed in the northern part of the subduction forearc. Samples were selected to represent all lithol...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.science/hal-03857700 https://hal.science/hal-03857700/document https://hal.science/hal-03857700/file/Geochem%20Geophys%20Geosyst%20-%202022%20-%20Bosch%20-%20Evolution%20of%20the%20Northern%20Part%20of%20the%20Lesser%20Antilles%20Arc%20Geochemical%20Constraints.pdf https://doi.org/10.1029/2022GC010482 |
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ftunimontpellier:oai:HAL:hal-03857700v1 2023-06-11T04:13:55+02:00 Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas Bosch, Delphine Zami, Fabienne Philippon, Mélody Lebrun, Jean‐frédéric Münch, Philippe Cornée, Jean‐jacques Legendre, Lucie Lemoyne, Alexandre Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Université de Montpellier (UM) Université des Antilles (UA) 2022-08-08 https://hal.science/hal-03857700 https://hal.science/hal-03857700/document https://hal.science/hal-03857700/file/Geochem%20Geophys%20Geosyst%20-%202022%20-%20Bosch%20-%20Evolution%20of%20the%20Northern%20Part%20of%20the%20Lesser%20Antilles%20Arc%20Geochemical%20Constraints.pdf https://doi.org/10.1029/2022GC010482 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GC010482 hal-03857700 https://hal.science/hal-03857700 https://hal.science/hal-03857700/document https://hal.science/hal-03857700/file/Geochem%20Geophys%20Geosyst%20-%202022%20-%20Bosch%20-%20Evolution%20of%20the%20Northern%20Part%20of%20the%20Lesser%20Antilles%20Arc%20Geochemical%20Constraints.pdf doi:10.1029/2022GC010482 http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-03857700 Geochemistry, Geophysics, Geosystems, 2022, 23 (2), pp.e2022GC010482. ⟨10.1029/2022GC010482⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftunimontpellier https://doi.org/10.1029/2022GC010482 2023-05-02T22:35:19Z International audience This study presents an extensive geochemical data set of 23 samples from St. Barthélemy Island, which belongs to the extinct branch of the Lesser Antilles arc and is currently exposed in the northern part of the subduction forearc. Samples were selected to represent all lithologies and main periods of magmatism, that is, Middle-Late Eocene, Early Oligocene and Late Oligocene. They show enrichment in light rare earth element/medium rare earth element, large ion lithophile elements (Rb and Ba) and isotopic characteristics, suggesting mixing between the mantle and a subduction component (oceanic crust + sediments). Trace element ratios suggest that primary magmas were generated in a normal mid-oceanic ridge basalt-type mantle-wedge that underwent 8%–18% partial melting in the spinel-stability field. The sediment contribution was low (0.1%–1%) irrespective of the age of the samples. This is similar to what is observed for the northern Lesser Antilles active branch. St. Barthélemy Island shares strong similarities with St. Martin Island, located on the same extinct arc branch, which suggests a similar geodynamic evolution. Oligocene samples displayed an increase in incompatible elements in the magma source, suggesting an increase in sediment melts, which could be correlated with a drastic change in the tectonic regime at that time, characterized by stretching perpendicular to the trench and subsequent basin opening. On Δ7/4Pb versus 206Pb/204Pb, the samples showed a similar trend for both active and extinct islands of the northern Lesser Antilles, suggesting negligible changes in the nature of the magma sources. Article in Journal/Newspaper Martin Island Université de Montpellier: HAL Martin Island ENVELOPE(56.967,56.967,-66.733,-66.733) Geochemistry, Geophysics, Geosystems 23 10 |
institution |
Open Polar |
collection |
Université de Montpellier: HAL |
op_collection_id |
ftunimontpellier |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Bosch, Delphine Zami, Fabienne Philippon, Mélody Lebrun, Jean‐frédéric Münch, Philippe Cornée, Jean‐jacques Legendre, Lucie Lemoyne, Alexandre Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience This study presents an extensive geochemical data set of 23 samples from St. Barthélemy Island, which belongs to the extinct branch of the Lesser Antilles arc and is currently exposed in the northern part of the subduction forearc. Samples were selected to represent all lithologies and main periods of magmatism, that is, Middle-Late Eocene, Early Oligocene and Late Oligocene. They show enrichment in light rare earth element/medium rare earth element, large ion lithophile elements (Rb and Ba) and isotopic characteristics, suggesting mixing between the mantle and a subduction component (oceanic crust + sediments). Trace element ratios suggest that primary magmas were generated in a normal mid-oceanic ridge basalt-type mantle-wedge that underwent 8%–18% partial melting in the spinel-stability field. The sediment contribution was low (0.1%–1%) irrespective of the age of the samples. This is similar to what is observed for the northern Lesser Antilles active branch. St. Barthélemy Island shares strong similarities with St. Martin Island, located on the same extinct arc branch, which suggests a similar geodynamic evolution. Oligocene samples displayed an increase in incompatible elements in the magma source, suggesting an increase in sediment melts, which could be correlated with a drastic change in the tectonic regime at that time, characterized by stretching perpendicular to the trench and subsequent basin opening. On Δ7/4Pb versus 206Pb/204Pb, the samples showed a similar trend for both active and extinct islands of the northern Lesser Antilles, suggesting negligible changes in the nature of the magma sources. |
author2 |
Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Université de Montpellier (UM) Université des Antilles (UA) |
format |
Article in Journal/Newspaper |
author |
Bosch, Delphine Zami, Fabienne Philippon, Mélody Lebrun, Jean‐frédéric Münch, Philippe Cornée, Jean‐jacques Legendre, Lucie Lemoyne, Alexandre |
author_facet |
Bosch, Delphine Zami, Fabienne Philippon, Mélody Lebrun, Jean‐frédéric Münch, Philippe Cornée, Jean‐jacques Legendre, Lucie Lemoyne, Alexandre |
author_sort |
Bosch, Delphine |
title |
Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas |
title_short |
Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas |
title_full |
Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas |
title_fullStr |
Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas |
title_full_unstemmed |
Evolution of the Northern Part of the Lesser Antilles Arc—Geochemical Constraints From St. Barthélemy Island Lavas |
title_sort |
evolution of the northern part of the lesser antilles arc—geochemical constraints from st. barthélemy island lavas |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03857700 https://hal.science/hal-03857700/document https://hal.science/hal-03857700/file/Geochem%20Geophys%20Geosyst%20-%202022%20-%20Bosch%20-%20Evolution%20of%20the%20Northern%20Part%20of%20the%20Lesser%20Antilles%20Arc%20Geochemical%20Constraints.pdf https://doi.org/10.1029/2022GC010482 |
long_lat |
ENVELOPE(56.967,56.967,-66.733,-66.733) |
geographic |
Martin Island |
geographic_facet |
Martin Island |
genre |
Martin Island |
genre_facet |
Martin Island |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-03857700 Geochemistry, Geophysics, Geosystems, 2022, 23 (2), pp.e2022GC010482. ⟨10.1029/2022GC010482⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GC010482 hal-03857700 https://hal.science/hal-03857700 https://hal.science/hal-03857700/document https://hal.science/hal-03857700/file/Geochem%20Geophys%20Geosyst%20-%202022%20-%20Bosch%20-%20Evolution%20of%20the%20Northern%20Part%20of%20the%20Lesser%20Antilles%20Arc%20Geochemical%20Constraints.pdf doi:10.1029/2022GC010482 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2022GC010482 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
23 |
container_issue |
10 |
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1768391377985470464 |