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Heterogeneous potassium isotopic composition of the upper continental crust

文献类型：期刊论文

作者Huang, Tian-Yi5; Teng, Fang-Zhen5; Rudnick, Roberta L.3,4; Chen, Xin-Yang5; Hu, Yan5; Liu, Yong-Sheng2; Wu, Fu-Yuan1
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2020-06-01
卷号278页码:122-136
关键词Potassium isotopes Granite Loess Shale Upper continental crust
ISSN号0016-7037
DOI10.1016/j.gca.2019.05.022
英文摘要Assessing the K isotopic composition of the upper continental crust is important for understanding the processes by which the crust is generated and modified, and constraining the K isotopic budget of the silicate Earth. High-precision K isotopic data are reported for 70 well-characterized individual and composite samples from the upper continental crust, including diorite, granodiorite, granite, loess, shale, graywacke, pelite, and tillite, to constrain its K isotopic composition. delta K-41 varies significantly in eight I-type and two S-type granites from Australia (-0.57 to -0.40 parts per thousand), nine A-type granites (-0.53 to -0.38 parts per thousand), and three granitoid composites including diorite, granodiorite, and granite (-0.50 to -0.37 parts per thousand) from China, mainly reflecting source heterogeneity. The 22 post-Archean Australian shales (PAAS) (delta K-41 = -0.68 to -0.12 parts per thousand) and the 12 sedimentary composites including graywacke, pelite, and tillite from China (delta K-41 = -0.57 to -0.23 parts per thousand) have heterogeneous K isotopic compositions while the 12 loess samples from around the world display more limited K isotopic variation (delta K-41 = -0.47 to -0.35 parts per thousand). delta K-41 values display a smaller dispersion in loess compared to shales, which have comparatively more intense weathering and higher chemical index of alteration (CIA). delta K-41 correlates with Fe2O3/Al2O3 and Fe2O3/K2O in shales and Al2O3/SiO2, K2O/Al2O3, and delta Li-7 in loess, suggesting that K isotopes are fractionated during chemical weathering. Overall, the upper continental crust has a heterogeneous K isotopic composition, ranging from -0.68 to -0.12 parts per thousand with an average delta K-41 of -0.44 +/- 0.05 parts per thousand (2SD, n = 88), which is indistinguishable from the mantle. (C) 2019 Elsevier Ltd. All rights reserved.
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000596123600010
出版者PERGAMON-ELSEVIER SCIENCE LTD
源URL[http://ir.iggcas.ac.cn/handle/132A11/99913]  
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Huang, Tian-Yi; Teng, Fang-Zhen
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
3.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA
4.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA
5.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
推荐引用方式
GB/T 7714		 Huang, Tian-Yi,Teng, Fang-Zhen,Rudnick, Roberta L.,et al. Heterogeneous potassium isotopic composition of the upper continental crust[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,278:122-136.
APA Huang, Tian-Yi.,Teng, Fang-Zhen.,Rudnick, Roberta L..,Chen, Xin-Yang.,Hu, Yan.,...&Wu, Fu-Yuan.(2020).Heterogeneous potassium isotopic composition of the upper continental crust.GEOCHIMICA ET COSMOCHIMICA ACTA,278,122-136.
MLA Huang, Tian-Yi,et al."Heterogeneous potassium isotopic composition of the upper continental crust".GEOCHIMICA ET COSMOCHIMICA ACTA 278(2020):122-136.

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来源：地质与地球物理研究所

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