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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Highly heterogeneous Pb isotope composition in the Archean continental lower crust: Insights from the high-grade metamorphic suite of the Taihua Group, Southern North China Craton

文献类型：期刊论文

作者Wang, Jing-Li1,2; Zhang, Hong-Fu1,3; Zhang, Juan1; Santosh, M.4,5; Bao, Zhi-An1
刊名PRECAMBRIAN RESEARCH
出版日期2020-11-01
卷号350页码:19
关键词Pb isotopes Archean lower crust Tectonic evolution Taihua Group Southern North China Craton
ISSN号0301-9268
DOI10.1016/j.precamres.2020.105927
英文摘要The petrological and geochemical compositions of Archean crust hold important information about the interaction between continental crust and lithospheric mantle. Here we apply in-situ microanalysis of Pb isotopes of the feldspars, which were collected from the high-grade terranes of the Taihua Group in Lushan area along the Southern North China Craton (S-NCC), by femtosecond laser ablation (fLA)-MC-ICPMS technique. The results show large variation in Pb isotopic compositions in plagioclase grains in different rock types. The feldspars in the 206 , granitoid gneisses show lower and variable radiogenic Pb isotopic ratios (Pb-206/Pb-204 = 13.8-16.8, Pb-207/Pb-204 = 14.6-15.1 and Pb-208/Pb-204 = 33.9-36.6) than that in the amphibolites (Pb-206/Pb-204 = 14.1-17.7, Pb-207/Pb-204 = 14.6-15.6, Pb-208/Pb-204 = 33.6-38.1) and lenticular garnet granulites Pb-206/Pb-204 = 14.4-17.7, Pb-207/Pb-204 = 14.7-15.7, Pb-208/Pb-204 = 33.7-37.7). Moreover, based on the singlestage Pb evolution model (common Pb in plagioclase), the age of the granitoid gneisses extracted from the mantle was estimated at 2.74 +/- 0.33 Ga, corresponding to the age of important period of crustal growth (similar to 2.7 Ga), and suggesting that the low-Pb granitoid gneisses are representative of the direct samples of the Archean crust. In addition, we also newly reported what was the Pb isotope characteristics of garnet granulites and pyroxene granulites in the Lower Taihua Group once located at the lower crustal level. The ubiquitous Pb isotope disequilibrium among different feldspar grains, especially in the overgrowth rims possessing more radiogenic Pb isotopes, suggests input of exotic melt/fluid with high mu (U-238/Pb-204) during the process of retrograde metamorphism. The large present-day Pb isotopic heterogeneity is probably due to various geological conditions experienced by different rocks.
WOS关键词ZIRCON U-PB ; TRONDHJEMITE-GRANODIORITE TTG ; PALEOPROTEROZOIC TECTONIC EVOLUTION ; ICP-MS ; PALAEOPROTEROZOIC AMALGAMATION ; COMPLEX IMPLICATIONS ; GRANULITE XENOLITHS ; HENAN PROVINCE ; CENTRAL ZONE ; LUSHAN AREA
资助项目National Natural Science Foundation of China[41803035] ; National Natural Science Foundation of China[91414301] ; National Natural Science Foundation of China[41473003] ; National Natural Science Foundation of China[91214203] ; Program for Changjiang Scholars and Innovative Research Team in University[IRT1281]
WOS研究方向Geology
语种英语
WOS记录号WOS:000589423600039
出版者ELSEVIER
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 ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University ; Program for Changjiang Scholars and Innovative Research Team in University
源URL[http://ir.iggcas.ac.cn/handle/132A11/99887]  
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Wang, Jing-Li; Zhang, Hong-Fu
作者单位1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
2.Shaanxi Earthquake Agcy, Xian 710068, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
4.Univ Adelaide, Dept Earth Sci, Adelaide, SA 5005, Australia
5.China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Jing-Li,Zhang, Hong-Fu,Zhang, Juan,et al. Highly heterogeneous Pb isotope composition in the Archean continental lower crust: Insights from the high-grade metamorphic suite of the Taihua Group, Southern North China Craton[J]. PRECAMBRIAN RESEARCH,2020,350:19.
APA Wang, Jing-Li,Zhang, Hong-Fu,Zhang, Juan,Santosh, M.,&Bao, Zhi-An.(2020).Highly heterogeneous Pb isotope composition in the Archean continental lower crust: Insights from the high-grade metamorphic suite of the Taihua Group, Southern North China Craton.PRECAMBRIAN RESEARCH,350,19.
MLA Wang, Jing-Li,et al."Highly heterogeneous Pb isotope composition in the Archean continental lower crust: Insights from the high-grade metamorphic suite of the Taihua Group, Southern North China Craton".PRECAMBRIAN RESEARCH 350(2020):19.

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来源：地质与地球物理研究所

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