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Tungsten isotopic constraints on homogenization of the Archean silicate Earth: Implications for the transition of tectonic regimes

文献类型：期刊论文

作者Mei, Qing-Feng1,2; Yang, Jin-Hui1,2; Wang, Ya-Fei3; Wang, Hao2; Peng, Peng1,2
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2020-06-01
卷号278页码:51-64
关键词Tungsten isotope Mantle differentiation Hadean Anshan Complex Barberton Greenstone Belt
ISSN号0016-7037
DOI10.1016/j.gca.2019.07.050
英文摘要The short-lived Hf-182-W-182 system has been used to constrain the early Earth's accretion and differentiation. This paper reports high precision W isotopic compositions and trace element concentrations for Archean (4.0-3.0 Ga) intermediate to felsic rocks from the Slave, North China, and Kaapvaal cratons to discuss early Earth differentiation and mantle mixing processes. The 4.0-3.8 Ga diorite and trondhjemite samples from the Acasta Gneiss Complex (AGC) in the Slave Craton and Anshan Complex in the North China Craton have positive mu W-182 values ranging from 8.3 +/- 3.6 to 14.5 +/- 4.0, whereas the 3.36-2.95 Ga TTG rocks from the North China Craton have a uniform modern mantle-like mu W-182 value of 0.7 +/- 3.9 (2 SD, n = 11); with one exception, the 3.32 Ga old sample F28-2, which has a positive mu W-182 anomaly (7.3 +/- 3.9 and 13.0 +/- 3.2 for two individual analyses). The Earth's oldest potassic granites, occurring as conglomerates in the Moodies Group, an intrusive trondhjemite, and an amphibolite with ages of similar to 3.55 Ga in the Kaapvaal Craton exhibit W isotopic compositions indistinguishable from what is proposed for the modern mantle. The positive W-182 anomalies in the 4.0-3.8 Ga rocks could possibly be the result of either early mantle differentiation that occurred within the lifetime of Hf-182 or a partial lack of late accreted material. The signature of W-182 excess in the 3.32 Ga sample (F28-2) is inherited from earlier crust, presumably similar to the 3.8 Ga TTGs, either by melting or crustal contamination. The transition in mu W-182 values from positive to near-zero would indicates that a significant event occurred at similar to 3.6 Ga which caused efficient mixing of early differentiated mantle and late accreted material, possibly indicating the transition of tectonic regimes from plume to plate tectonics on the Earth. (C) 2019 Elsevier Ltd. All rights reserved.
WOS关键词HIGHLY SIDEROPHILE ELEMENT ; EARLY MANTLE DIFFERENTIATION ; BARBERTON GREENSTONE-BELT ; ANCIENT GNEISS COMPLEX ; ACASTA-GNEISS ; NORTHWESTERN CANADA ; ND-142 EVIDENCE ; W-182 EVIDENCE ; CORE FORMATION ; HADEAN CRUST
资助项目National Natural Science Foundation of China[41521062] ; National Natural Science Foundation of China[41490631]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000596123600005
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/99895]  
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Yang, Jin-Hui
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Inst Earth Sci, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Mei, Qing-Feng,Yang, Jin-Hui,Wang, Ya-Fei,et al. Tungsten isotopic constraints on homogenization of the Archean silicate Earth: Implications for the transition of tectonic regimes[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,278:51-64.
APA Mei, Qing-Feng,Yang, Jin-Hui,Wang, Ya-Fei,Wang, Hao,&Peng, Peng.(2020).Tungsten isotopic constraints on homogenization of the Archean silicate Earth: Implications for the transition of tectonic regimes.GEOCHIMICA ET COSMOCHIMICA ACTA,278,51-64.
MLA Mei, Qing-Feng,et al."Tungsten isotopic constraints on homogenization of the Archean silicate Earth: Implications for the transition of tectonic regimes".GEOCHIMICA ET COSMOCHIMICA ACTA 278(2020):51-64.

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来源：地质与地球物理研究所

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