气候变化领域集成服务门户(CCPortal): Diffusion-induced lithium isotopic heterogeneity in olivines from peridotites of an oceanized mantle lithosphere at the Yunzhug ophiolite (central Tibet)

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DOI	10.1038/s41598-024-54616-6
	Diffusion-induced lithium isotopic heterogeneity in olivines from peridotites of an oceanized mantle lithosphere at the Yunzhug ophiolite (central Tibet)
	Shi, Ren-Deng; Cui, Guang-hao; Huang, Qi-Shuai; Huang, Xiao-Xiao; Zou, Haibo; Gong, Xiaohan; Yang, Jing-Sui
发表日期	2024
ISSN	2045-2322
起始页码	14
结束页码	1
卷号	14 期号:1
英文摘要	This paper reports lithium concentrations and isotopic compositions of olivines in the oceanized subcontinental lithospheric mantle (SCLM) peridotites of the Tibetan Yunzhug ophiolite. The results show systematic Li isotope changes with distance from the rim of olivine grains. delta 7Li values of olivine in dunites decrease from + 10.46 to + 1.33 parts per thousand with increasing distance to olivine rim from 26.15 to 124.71 mu m. A negative correlation of delta 7Li and Li content in olivine from dunite and harzburgite indicates recent diffusive ingress of Li into the peridotites. The extremely heavy Li isotopic composition requires the seawater or seawater alteration endmember in the mixing model, and reveals Li diffusion from seawater into olivine. As in dunites, olivines in a harzburgite sample show similar variations in delta 7Li as a function of distance from the grain rim (e.g., 6.01 to 1.73 in sample 14YZ13). We suggest that the behavior of Li in the oceanized SCLM peridotites may be controlled by Li diffusion from seawater, as Li activity in the liquid state is higher than the solid state in transporting Li through the olivines in the peridotites. This study supports that seawater Li diffusion is one of the important factors for the heterogeneity of mantle Li isotopes in ophiolites.
英文关键词	Li isotopes; Heterogeneity; Seawater diffusion; SCLM peridotite; Tibetan Yunzhug ophiolite
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001164346500010
来源期刊	SCIENTIFIC REPORTS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/296542
作者单位	Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; North China University of Water Resources & Electric Power; Auburn University System; Auburn University; China University of Geosciences; Nanjing University
推荐引用方式 GB/T 7714	Shi, Ren-Deng,Cui, Guang-hao,Huang, Qi-Shuai,et al. Diffusion-induced lithium isotopic heterogeneity in olivines from peridotites of an oceanized mantle lithosphere at the Yunzhug ophiolite (central Tibet)[J]. 中国科学院青藏高原研究所,2024,14(1).
APA	Shi, Ren-Deng.,Cui, Guang-hao.,Huang, Qi-Shuai.,Huang, Xiao-Xiao.,Zou, Haibo.,...&Yang, Jing-Sui.(2024).Diffusion-induced lithium isotopic heterogeneity in olivines from peridotites of an oceanized mantle lithosphere at the Yunzhug ophiolite (central Tibet).SCIENTIFIC REPORTS,14(1).
MLA	Shi, Ren-Deng,et al."Diffusion-induced lithium isotopic heterogeneity in olivines from peridotites of an oceanized mantle lithosphere at the Yunzhug ophiolite (central Tibet)".SCIENTIFIC REPORTS 14.1(2024).