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Geochemistry and petrogenesis of Late Permian basalts from the Sichuan Basin, SW China: Implications for the geodynamics of the Emeishan mantle plume

文献类型：期刊论文

作者Meng, Fanchao1,2,3; Tian, Yulu1,2,3; Kerr, Andrew C.4; Wang, Wei5; Wu, Zhiping1,2,3; Xu, Qiang6; Du, Qing1,2,3; Zhou, Yaoqi1,2,3; Liu, Jiaqi7
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2023
卷号241页码:19
ISSN号1367-9120
关键词Emeishan mantle plume Outer zone Sichuan Basin basalts petrogenesis of high-Ti basalts Plume-lithosphere interaction
DOI10.1016/j.jseaes.2022.105477
英文摘要Plume-lithosphere interactions are significant in the formation of Large Igneous Provinces (LIPs). The Permian Emeishan Large Igneous Province (ELIP) is considered to be the result of a mantle plume. The Emeishan flood basalts comprise a major part of the ELIP and they define three zones: the inner, intermediate and outer zones. Both high-Ti and low-Ti basalts are present in the inner zone, whereas only high-Ti basalts are found in the intermediate zone and outer zone. However, there are only sparse outcrops in the outer zone, and so geochemical data on basalts from the outer zone are rare and the role of plume-lithosphere interaction in the petrogenesis of volcanic rocks in the outer zone remains poorly understood. In the Sichuan basin, the Basalt Formation is found between the Permian Maokou Formation limestone and the Longtan Formation marl in some drill cores as well as in outcrops in the basin. This relationship demonstrates that the basaltic layer in the basin is part of the Emeishan flood basalts. These basalts have TiO2 contents of 3.7-4.2 wt% and Ti/Y ratios of 604-720, being high-Ti subalkaline basalts. They display chondrite-normalized rare earth elements (REE) patterns enriched in light rare earth elements (LREE) relative to heavy rare earth elements (HREE) and have elevated large ion lithophile elements (LILE) and high field strength elements (HFSE). Lead isotope ratios are high ((206)pb/(204)pb(t) = 18.102-18.392, (207)pb/(204)pb(t) = 15.578-15.606, (208)pb/(204)pb(t) = 38.410-38.850), and epsilon(Nd)(t) values are -0.38 similar to 1.17. Detailed petrology and geochemistry suggest that the high-Ti basalts from the Sichuan Basin did not experience significant contamination of crustal and lithospheric mantle material during the ascent of magma. We infer that these basalts resulted from low-degree melting of the plume mantle source and underwent fractional crystallization of clinopyroxene. The distribution and petrogenesis of the Sichuan Basin basalts in the outer zone are different from those of the basalts in the inner zone and there are clearly different plume-lithosphere interactions in different parts of the ELIP. In the inner zone, the temperature of the lithosphere mantle was markedly elevated due to underplating of the mantle plume, causing a substantial quantity of lithosphere mantle melting and the initial formation of low-Ti basalts. This was followed by melting of the mantle plume and the formation of high-Ti basalts. In the outer zone, lower temperatures further from the plume centre were insufficient to generate extensive melting of the lithospheric mantle. Consequently, only the mantle plume melted in the outer zone, resulting in the formation of high-Ti basalts with minimal lithospheric input.
WOS关键词LARGE IGNEOUS PROVINCE ; ZIRCON U-PB ; CONTINENTAL FLOOD BASALTS ; ND ISOTOPE GEOCHEMISTRY ; VOLCANIC-ROCKS ; TRACE-ELEMENT ; YUNNAN PROVINCE ; SR ISOTOPE ; HIGH-TI ; SOUTHWESTERN CHINA
资助项目Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao)[2021QNLM020001-1] ; National Natural Science Foundation of China Project[42272225] ; National Natural Science Foundation of China Project[42072169] ; Shandong Provincial Natural Science Foundation, China[ZR2021MD083]
WOS研究方向Geology
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000891297200002
资助机构Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; Shandong Provincial Natural Science Foundation, China ; Shandong Provincial Natural Science Foundation, China ; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; Shandong Provincial Natural Science Foundation, China ; Shandong Provincial Natural Science Foundation, China ; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; Shandong Provincial Natural Science Foundation, China ; Shandong Provincial Natural Science Foundation, China ; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) ; National Natural Science Foundation of China Project ; National Natural Science Foundation of China Project ; Shandong Provincial Natural Science Foundation, China ; Shandong Provincial Natural Science Foundation, China
源URL[http://ir.iggcas.ac.cn/handle/132A11/106996]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Meng, Fanchao; Kerr, Andrew C.
作者单位1.China Univ Petr East China, Sch Geosci, Qingdao 266580, Peoples R China
2.Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao 266061, Peoples R China
3.China Univ Petr East China, Shandong Prov Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
4.Cardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3AT, Wales
5.PetroChina, Explorat & Dev Res Inst Southwest Oil & Gas Field, Chengdu 610041, Peoples R China
6.Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Meng, Fanchao,Tian, Yulu,Kerr, Andrew C.,et al. Geochemistry and petrogenesis of Late Permian basalts from the Sichuan Basin, SW China: Implications for the geodynamics of the Emeishan mantle plume[J]. JOURNAL OF ASIAN EARTH SCIENCES,2023,241:19.
APA Meng, Fanchao.,Tian, Yulu.,Kerr, Andrew C..,Wang, Wei.,Wu, Zhiping.,...&Liu, Jiaqi.(2023).Geochemistry and petrogenesis of Late Permian basalts from the Sichuan Basin, SW China: Implications for the geodynamics of the Emeishan mantle plume.JOURNAL OF ASIAN EARTH SCIENCES,241,19.
MLA Meng, Fanchao,et al."Geochemistry and petrogenesis of Late Permian basalts from the Sichuan Basin, SW China: Implications for the geodynamics of the Emeishan mantle plume".JOURNAL OF ASIAN EARTH SCIENCES 241(2023):19.

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