Cryptic metasomatism revealed by Li isotopes of mantle xenoliths beneath the Thrace Basin, NW Turkey

doi:10.1016/j.jseaes.2018.08.025

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Cryptic metasomatism revealed by Li isotopes of mantle xenoliths beneath the Thrace Basin, NW Turkey
	Jing, Jie-Jun 1,2,3; Su, Ben-Xun 1,2; Xiao, Yan 3; Martin, Laure 4; Zhang, Hong-Fu 2,3; Uysal, Ibrahim 5; Chen, Chen 1,2; Lin, Wei 2,3; Chu, Yang 2,3; Seitz, Hans-Michael 6
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2018-10-15
卷号	166 页码:270-278
关键词	Li isotopes Mantle xenolith Mantle metasomatism Tethyan ocean Turkey
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2018.08.025
英文摘要	To identify metasomatic overprints in the mantle xenoliths from the Tethys orogenic belt in NW Turkey, we report here in situ Li concentrations and isotopic compositions of olivine, clinopyroxene and orthopyroxene along with major element compositions of minerals, and whole-rock trace element compositions of the mantle xenoliths composed of refractory harzburgites with subordinate lherzolites and one olivine-websterite. Their non-depleted whole-rock light rare earth element (LREE) patterns, enrichment in large ion lithophile elements and depletion of high field strength elements, imply subduction-related metasomatism, while the Y-depletion may indicate the derivation of the metasomatic melts/fluids from a garnet-bearing source. Minerals from all the xenoliths display homogeneous major element compositions, however they show large intra- and inter-mineral Li elemental and isotopic variations. The Li contents of olivines range from 1.45 to 2.81 ppm with large variations in delta Li-7 values (+ 1.2 to + 17.5 parts per thousand). The orthopyroxenes have variable Li contents (0.07-16.6 ppm) and delta Li-7 values (-71.6 to + 10.8960), with higher Li contents and lower delta(7) Li values in their cores. The clinopyroxenes show variable Li contents (2.16-22.0 ppm) and delta(7) Li values (-54.6 to + 1.9 parts per thousand), with commonly higher Li contents and lower delta Li-7 values in their cores. The Li-isotopic zonation observed in most pyroxene grains is most likely a recent overprint of subduction-related fluids. By contrast, olivines with fairly homogeneous low Li contents compared to pyroxenes appear to be less affected by the metasomatic melts/fluids. The correlation between delta Li-7 values and the forsterite contents of olivines, along with the preferential uptake of Li in pyroxenes, and the presence of light Li isotopic compositions in the cores of pyroxenes, indicate the influence of silicate melt-rock interaction. We interpret these results as evidence for a metasomatic overprint predating the zonation in the Tethys orogenic belt of NW Turkey. Thus, both the recent fluid metasomatism and earlier silicate melt metasomatism are strongly related with the successive subduction of the Tethyan oceanic plate.
资助项目	National Natural Science Foundation of China[41522203] ; National Natural Science Foundation of China[91755205] ; State Key Laboratory of Lithospheric Evolution[201701] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2016067]
WOS关键词	NORTH CHINA CRATON ; CONTINENTAL LITHOSPHERIC MANTLE ; SPINEL PERIDOTITE XENOLITHS ; ALKALINE VOLCANIC-ROCKS ; LITHIUM ISOTOPES ; GEOCHEMICAL EVIDENCE ; HIGH-TEMPERATURE ; TRACE-ELEMENT ; RIDGE BASALTS ; LAKE SAPANCA
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000450379800022
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89465]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Jing, Jie-Jun; Su, Ben-Xun
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China 4.Univ Western Australia, Ctr Microscopy Characterisat & Anal, Crawley, WA 6009, Australia 5.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey 6.Goethe Univ Frankfurt, Altenhoferallee 1, Frankfurt, Germany 7.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Jing, Jie-Jun,Su, Ben-Xun,Xiao, Yan,et al. Cryptic metasomatism revealed by Li isotopes of mantle xenoliths beneath the Thrace Basin, NW Turkey[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,166:270-278.
APA	Jing, Jie-Jun.,Su, Ben-Xun.,Xiao, Yan.,Martin, Laure.,Zhang, Hong-Fu.,...&Zhang, Peng-Fei.(2018).Cryptic metasomatism revealed by Li isotopes of mantle xenoliths beneath the Thrace Basin, NW Turkey.JOURNAL OF ASIAN EARTH SCIENCES,166,270-278.
MLA	Jing, Jie-Jun,et al."Cryptic metasomatism revealed by Li isotopes of mantle xenoliths beneath the Thrace Basin, NW Turkey".JOURNAL OF ASIAN EARTH SCIENCES 166(2018):270-278.