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Cryptic metasomatism revealed by Li isotopes of mantle xenoliths beneath the Thrace Basin, NW Turkey
Jing, Jie-Jun1,2,3; Su, Ben-Xun1,2; Xiao, Yan3; Martin, Laure4; Zhang, Hong-Fu2,3; Uysal, Ibrahim5; Chen, Chen1,2; Lin, Wei2,3; Chu, Yang2,3; Seitz, Hans-Michael6; Zhang, Peng-Fei7
2018-10-15
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号166页码:270-278
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.
关键词Li isotopes Mantle xenolith Mantle metasomatism Tethyan ocean Turkey
DOI10.1016/j.jseaes.2018.08.025
资助者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
关键词[WOS]NORTH CHINA CRATON ; CONTINENTAL LITHOSPHERIC MANTLE ; SPINEL PERIDOTITE XENOLITHS ; ALKALINE VOLCANIC-ROCKS ; LITHIUM ISOTOPES ; GEOCHEMICAL EVIDENCE ; HIGH-TEMPERATURE ; TRACE-ELEMENT ; RIDGE BASALTS ; LAKE SAPANCA
语种英语
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]
资助者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
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000450379800022
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89465
专题矿产资源研究院重点实验室
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
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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.
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