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Redox heterogeneity of picritic lavas with respect to their mantle sources in the Emeishan large igneous province

文献类型：期刊论文

作者Wu, Ya-Dong1,2; Yang, Jin-Hui1,2,3; Stagno, Vincenzo4; Nekrylov, Nikolai5,6; Wang, Jin-Tuan7; Wang, Hao1,2,3
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-03-01
卷号320页码:161-178
关键词Oxygen fugacity Picrite Large igneous province Emeishan Carbon cycle
ISSN号0016-7037
DOI10.1016/j.gca.2022.01.001
英文摘要The oxygen fugacity (fO(2)) of the Earth's mantle is a key parameter that regulates fundamental geological processes such as planetary differentiation, mantle melting, and volatile cycling. Large igneous provinces (LIPs) are among the most volumi-nous mafic volcanic eruptions in the Earth's history. Constraining the fO(2) of LIP rocks is critical for understanding the redox state of the mantle and migration of volatiles from the deep Earth to the atmosphere. Here, we investigated primitive picrites from the Dali and Lijiang areas belonging to the Emeishan LIP, which contain early-crystallized olivine phenocrysts with Fo contents up to 93.5 and 91.9, respectively. The fO(2) conditions of primary and derivative melts are determined by the olivine-spinel and olivine-melt V oxybarometers, aided by temperature estimates from olivine-spinel Al and olivine-melt Sc/Y ther-mometers. The calculated fO(2) values are negatively correlated with olivine Fo contents due to fractionation of mafic minerals in a system closed to oxygen. The fO(2)s of Dali and Lijiang primary melts are-0.8 +/- 0.4 and + 0.6 +/- 0.3 (1 sigma) delta FMQ log units, respectively, more variable than those of primitive MORBs, indicating significant fO(2) fluctuations in primary magmas from the Emeishan LIP caused by changes in both redox state of the source rock and depth of melt extraction. Melt barom-eter constrains the Dali and Lijiang primary melts generated at 4.7 and 3.0 GPa, respectively. After correcting for the depth effect, the Dali and Lijiang sources are more oxidized (with higher Fe3+/sigma Fe ratios), in varying degrees, than the ambient upper mantle, likely due to incorporation of recycled surface materials. Under such oxidized conditions, mantle carbon is effi-ciently extracted during melting in the form of CO(2 )and released to the atmosphere during massive magma emplacement, which may have played an important role in causing the climatic and environmental changes and triggering the end-Guadalupian mass extinction.& nbsp;(c) 2022 Elsevier Ltd. All rights reserved.
WOS关键词HOSTED MELT INCLUSIONS ; FLOOD-BASALT PROVINCE ; LA-ICP-MS ; OXIDATION-STATE ; SW CHINA ; OXYGEN FUGACITY ; TRACE-ELEMENTS ; MORB GLASSES ; EXPERIMENTAL CALIBRATION ; OLIVINE PHENOCRYSTS
资助项目Ministry of Science and Technology of People's Republic of China[2016YFC0600109] ; China Postdoctoral Science Foundation[2020M670450]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000786623000007
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/105157]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wu, Ya-Dong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Sapienza Univ Rome, Dept Earth Sci, Rome, Italy
5.Fersman Mineral Museum RAS, Leninsky Ave 18-2, Moscow 119071, Russia
6.Inst Volcanol & Seismol FEB RAS, Petropavlovsk Kamchatski, Russia
7.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Ya-Dong,Yang, Jin-Hui,Stagno, Vincenzo,et al. Redox heterogeneity of picritic lavas with respect to their mantle sources in the Emeishan large igneous province[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,320:161-178.
APA Wu, Ya-Dong,Yang, Jin-Hui,Stagno, Vincenzo,Nekrylov, Nikolai,Wang, Jin-Tuan,&Wang, Hao.(2022).Redox heterogeneity of picritic lavas with respect to their mantle sources in the Emeishan large igneous province.GEOCHIMICA ET COSMOCHIMICA ACTA,320,161-178.
MLA Wu, Ya-Dong,et al."Redox heterogeneity of picritic lavas with respect to their mantle sources in the Emeishan large igneous province".GEOCHIMICA ET COSMOCHIMICA ACTA 320(2022):161-178.

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来源：地质与地球物理研究所

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