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DOI	10.1029/2020JB021022
	Nature of the Mantle Plume Under the Emeishan Large Igneous Province: Constraints From Olivine-Hosted Melt Inclusions of the Lijiang Picrites
	Zhang L.; Ren Z.-Y.; Zhang L.; Wu Y.-D.; Qian S.-P.; Xia X.-P.; Xu Y.-G.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Olivine-hosted melt inclusions have the potential to provide direct evidence about the nature of the mantle sources of magmas. In this study, we report the major and trace element and Sr–Nd–Pb–Hf isotope compositions of the Lijiang picrites from the Emeishan large igneous province, as well as major and trace element and Pb isotopic compositions of olivine-hosted melt inclusions in the picrites. Using these data, we infer the nature of the mantle sources for the Lijiang high-Ti picrites (Ti/Y = 645–654), and compare them with the Dali low-Ti picrites (Ti/Y = 351–408). Lijiang melt inclusions have highly heterogeneous Pb isotope compositions (208Pb/206Pb = 2.015–2.201, 207Pb/206Pb = 0.812–0.882, 260 Ma age-corrected) that overlap the majority of the fields from FOZO to enriched mantle 1 (EM1). The primitive mantle-normalized trace element patterns of these melt inclusions reveal an enriched composition with depletions in Ba, Nb, Ta, Zr, and Hf. We suggest that an old recycled GLOSS II-like sediment was probably the main component that imparted the EM1 signature into the sources of the Lijiang picrites. Furthermore, we reverse calculated the mantle potential temperature (Tp) beneath Lijiang and Dali using the Al-in-ol temperature. The estimated mantle Tp beneath Lijiang is lower than Dali. We infer that the Lijiang picrites might have originated from the mantle plume with lower thermal energy, corresponding to the waning stage of the axis of the Emeishan mantle plume. Our study suggest that high-Ti magmas of the Emeishan large igneous province were derived from those parts or stages of the mantle plume with lower thermal energy. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Al-in-ol thermometer; EM1; Emeishan large igneous province; melt inclusion; recycled component
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187128
作者单位	State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
推荐引用方式 GB/T 7714	Zhang L.,Ren Z.-Y.,Zhang L.,et al. Nature of the Mantle Plume Under the Emeishan Large Igneous Province: Constraints From Olivine-Hosted Melt Inclusions of the Lijiang Picrites[J],2021,126(5).
APA	Zhang L..,Ren Z.-Y..,Zhang L..,Wu Y.-D..,Qian S.-P..,...&Xu Y.-G..(2021).Nature of the Mantle Plume Under the Emeishan Large Igneous Province: Constraints From Olivine-Hosted Melt Inclusions of the Lijiang Picrites.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Zhang L.,et al."Nature of the Mantle Plume Under the Emeishan Large Igneous Province: Constraints From Olivine-Hosted Melt Inclusions of the Lijiang Picrites".Journal of Geophysical Research: Solid Earth 126.5(2021).