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Water content and geochemistry of the Cenozoic basalts in SE China : implications for enrichment in the mantle source of intra-plate basalts

Abstract : The major and trace element contents, Sr-Nd-Pb isotope, H2O contents and the cpx phenocryst O isotope of Cenozoic basalts from 11 places with distinct geological backgrounds in SE China have been measured to decipher the relationship between the possible recycled components and mantle geochemical heterogeneities. Zhejiang basalts erupted in two stages, 20-27Ma and after 11Ma. Their H2O contents range from 1.3-2.6%. The estimated H2O contents of initial basaltic melts for the Shiheng basalts range from 1.3-2.4%; the Bailin diabases have “fake” basaltic melt water contents from 1.9-2.1%; and the Mingxi basalts have initial H2O contents of 0.3-0.5%, in Fujian. H2O content the basalts from Leihuling (LH), Dayang (DY) and Fujitian (FJT) areas in Hainan are 2.7 wt. %, 1.3 wt. %, and 2.6 wt. %. The Xilong basalts from Zhejiang, Mingxi basalts from Fujian and Leihuling basalts from Hainan involved recycled oceanic crust components in the mantle source, while the Gaoping and Shuangcai basalts from Zhejiang, Shiheng, Bailin, and Niutoushan basalts from Fujian as well as the Maanling, Dayang and Fujitian basalts from Hainan involved recycled oceanic sediments and crust components in their mantle source. Overall, the SE China Cenozoic basalts have involved the recycled oceanic materials in their mantle source. The recycled oceanic materials have different existential state and locations, when the geological history of SE China are considered. The subducted Pacific slab most likely effect the composition of mantle in SE China
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https://tel.archives-ouvertes.fr/tel-01835797
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Submitted on : Wednesday, July 11, 2018 - 4:40:06 PM
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  • HAL Id : tel-01835797, version 1

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Shaochen Liu. Water content and geochemistry of the Cenozoic basalts in SE China : implications for enrichment in the mantle source of intra-plate basalts. Earth Sciences. Université de Lorraine, 2017. English. ⟨NNT : 2017LORR0360⟩. ⟨tel-01835797⟩

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