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Lead isotopic compositions of late Archean lower continental crust

文献类型：期刊论文

作者Liu, Danqing1,2; Guo, Jinghui1,2; Jiang, Neng1,2; Hu, Jun1,2; Mitchell, Ross N.2; Fan, Wenbo3; Mao, Qian2; Zhao, Lang1,2
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-11-15
卷号337页码:95-105
ISSN号0016-7037
关键词Pb paradox Granulite terrain Granulite xenolith Lower crust
DOI10.1016/j.gca.2022.09.024
英文摘要Lead isotopes of Earth's accessible silicate rocks are generally too radiogenic for the planet to have formed from meteoritic material-a problem known as the first Pb paradox. The search for an unradiogenic reservoir to balance Earth's bulk composition has thus focused, with varying degrees of success, on inaccessible rocks in the core, mantle, and lower crust. Whether the lower continental crust balances the radiogenic depleted mantle and upper crust is debated and largely depends on how unradiogenic the lower crust, in particular the Archean lower crust, is. In this work, granulite terrain, granulite xenoliths, and lower crustal-derived granitoids from the same region of the northern North China craton (NCC) are combined to constrain the Pb isotopic compositions of the late Archean lower crust. The Hannuoba pyroxene-rich mafic granulite xenoliths are interpreted as restites left after partial melting of the late Archean lower crust to produce the Mesozoic granitoids. Both the xenoliths and granitoids have similar Pb isotopic compositions that are much more radiogenic than the granulite facies gneisses from the Huai'an terrain. The results rule out the notion that the lower crust is inherently poor in U and Th relative to Pb and suggest that the Pb isotopic compositions of the granulite facies gneisses are not representative of the Archean lower crust. This rule may be generally applicable to other regions because the Huai'an terrain is chemically and isotopically comparable with several other Archean unradiogenic granulite ter-rains (e.g., the Lewisian). We argue that the late Archean lower crust may not be so extremely unradio-genic in Pb isotopic compositions as commonly thought and the lower crust appears insufficiently unradiogenic to balance the accessible Earth. We also provide evidence that intracrustal differentiation via lower crustal melting could be an important mechanism causing the elevated Th/U and 208Pb/206Pb in the upper crust. (C) 2022 Elsevier Ltd. All rights reserved.
WOS关键词PB ZIRCON GEOCHRONOLOGY ; NORTH CHINA CRATON ; GRANULITE XENOLITHS ; HANNUOBA BASALTS ; LEWISIAN COMPLEX ; EASTERN CHINA ; UNRADIOGENIC LEAD ; DAMARA OROGEN ; CONSTRAINTS ; EVOLUTION
资助项目National Natural Science Foundation of China[41890832] ; National Natural Science Foundation of China[41973034] ; National Natural Science Foundation of China[41890833]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000875755300002
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/132A11/107763]  
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Jiang, Neng
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Northwest Univ, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Danqing,Guo, Jinghui,Jiang, Neng,et al. Lead isotopic compositions of late Archean lower continental crust[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,337:95-105.
APA Liu, Danqing.,Guo, Jinghui.,Jiang, Neng.,Hu, Jun.,Mitchell, Ross N..,...&Zhao, Lang.(2022).Lead isotopic compositions of late Archean lower continental crust.GEOCHIMICA ET COSMOCHIMICA ACTA,337,95-105.
MLA Liu, Danqing,et al."Lead isotopic compositions of late Archean lower continental crust".GEOCHIMICA ET COSMOCHIMICA ACTA 337(2022):95-105.

入库方式： OAI收割

来源：地质与地球物理研究所

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