Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabases
The Santos Basin, a passive continental margin basin recognized for its vast deep-sea hydrocarbon potential, poses unique geological issues due to the large amount of igneous rocks revealed by drilling data. In order to understand the magmatic evolution during the post-rift phase, we studied petrolo...
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Frontiers Media S.A.
2025-01-01
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1497913/full |
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| author | Wenyuan He Hongping Wang Jinglin Su Wangquan Wang Junfeng Zhao Guoping Zuo Tongkui Wang Liu Yang Kangxu Ren Chaofeng Wang Jian Zhao Yuan Guo Yonggang Zhang Jing Sun |
| author_facet | Wenyuan He Hongping Wang Jinglin Su Wangquan Wang Junfeng Zhao Guoping Zuo Tongkui Wang Liu Yang Kangxu Ren Chaofeng Wang Jian Zhao Yuan Guo Yonggang Zhang Jing Sun |
| author_sort | Wenyuan He |
| collection | DOAJ |
| description | The Santos Basin, a passive continental margin basin recognized for its vast deep-sea hydrocarbon potential, poses unique geological issues due to the large amount of igneous rocks revealed by drilling data. In order to understand the magmatic evolution during the post-rift phase, we studied petrology, major elements, trace elements, and Sr-Nd isotopic composition of bulk rock, and Ar-Ar dating on whole rock and minerals on basalts and diabases from Santos Basin. Ar-Ar dating results suggest that basalts and diabases emplaced on ∼126–121 Ma. The geochemistry and Sr-Nd isotopic compositions indicates the derivation of these rocks from the spinel and garnet lherzolite facies, denoted by increased La/Sm ratios that suggest a 1%–5% degree of partial melting. These findings correspond with the characteristics of continental rift basalts. The geochemical analysis hints that the older basalts and diabases were likely derived from the asthenospheric mantle, whereas the younger ones display a geochemical mix indicative of contributions from both the deeper asthenosphere and the subcontinental lithospheric mantle (SCLM), or possibly from crustal contamination. A proposed hypothetical model indicating that the deepening of the basin into the asthenosphere, in conjunction with the thinning and stretching of the lithosphere, could have been instrumental in the magmatic events recorded in the region. |
| format | Article |
| id | doaj-art-d61079a1536d43bb946823ee2ac4cde2 |
| institution | Kabale University |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj-art-d61079a1536d43bb946823ee2ac4cde22025-01-06T06:58:52ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-01-011210.3389/feart.2024.14979131497913Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabasesWenyuan He0Hongping Wang1Jinglin Su2Wangquan Wang3Junfeng Zhao4Guoping Zuo5Tongkui Wang6Liu Yang7Kangxu Ren8Chaofeng Wang9Jian Zhao10Yuan Guo11Yonggang Zhang12Jing Sun13China National Oil and Gas Exploration and Development Corporation, Beijing, ChinaPetroChina Hangzhou Research Institute of Geology, Hangzhou, ChinaCollege of Geosciences, China University of Petroleum, Beijing, ChinaChina National Oil and Gas Exploration and Development Corporation, Beijing, ChinaCNPC Brasil Petroleo e Gas Ltda, Rio deJaneiro, BrazilPetroChina Hangzhou Research Institute of Geology, Hangzhou, ChinaCNPC Brasil Petroleo e Gas Ltda, Rio deJaneiro, BrazilPetroChina Hangzhou Research Institute of Geology, Hangzhou, ChinaCNPC Brasil Petroleo e Gas Ltda, Rio deJaneiro, BrazilPetroChina Hangzhou Research Institute of Geology, Hangzhou, ChinaCNPC Brasil Petroleo e Gas Ltda, Rio deJaneiro, BrazilCNPC Brasil Petroleo e Gas Ltda, Rio deJaneiro, BrazilPetroChina Hangzhou Research Institute of Geology, Hangzhou, ChinaCollege of Geosciences, China University of Petroleum, Beijing, ChinaThe Santos Basin, a passive continental margin basin recognized for its vast deep-sea hydrocarbon potential, poses unique geological issues due to the large amount of igneous rocks revealed by drilling data. In order to understand the magmatic evolution during the post-rift phase, we studied petrology, major elements, trace elements, and Sr-Nd isotopic composition of bulk rock, and Ar-Ar dating on whole rock and minerals on basalts and diabases from Santos Basin. Ar-Ar dating results suggest that basalts and diabases emplaced on ∼126–121 Ma. The geochemistry and Sr-Nd isotopic compositions indicates the derivation of these rocks from the spinel and garnet lherzolite facies, denoted by increased La/Sm ratios that suggest a 1%–5% degree of partial melting. These findings correspond with the characteristics of continental rift basalts. The geochemical analysis hints that the older basalts and diabases were likely derived from the asthenospheric mantle, whereas the younger ones display a geochemical mix indicative of contributions from both the deeper asthenosphere and the subcontinental lithospheric mantle (SCLM), or possibly from crustal contamination. A proposed hypothetical model indicating that the deepening of the basin into the asthenosphere, in conjunction with the thinning and stretching of the lithosphere, could have been instrumental in the magmatic events recorded in the region.https://www.frontiersin.org/articles/10.3389/feart.2024.1497913/fullsantos basinpre-saltcontinental rift basaltsSr-Nd isotopesAr-Ar dating |
| spellingShingle | Wenyuan He Hongping Wang Jinglin Su Wangquan Wang Junfeng Zhao Guoping Zuo Tongkui Wang Liu Yang Kangxu Ren Chaofeng Wang Jian Zhao Yuan Guo Yonggang Zhang Jing Sun Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabases Frontiers in Earth Science santos basin pre-salt continental rift basalts Sr-Nd isotopes Ar-Ar dating |
| title | Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabases |
| title_full | Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabases |
| title_fullStr | Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabases |
| title_full_unstemmed | Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabases |
| title_short | Magma evolution during the post-rift phase of the Santos Basin, Brazil: petrogenesis and geochemistry of ∼126–121 ma basalts and diabases |
| title_sort | magma evolution during the post rift phase of the santos basin brazil petrogenesis and geochemistry of ∼126 121 ma basalts and diabases |
| topic | santos basin pre-salt continental rift basalts Sr-Nd isotopes Ar-Ar dating |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1497913/full |
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