Neoarchean-Paleoproterozoic Multi-Stage Geological Events and Their Tectonic Implications in the Fuping Complex, North China Craton

被引：0
|
作者：
Du L. [1 ]
Yang C. [1 ]
Song H. [1 ]
Wang J. [1 ]
Duan Q. [1 ]
Huang Z. [1 ]
Cheng H. [2 ]
Geng Y. [1 ]
Ren L. [1 ]
机构：
[1] Institute of Geology, Chinese Academy of Geological Sciences, Beijing
[2] Institute of Regional Geological Survey of Hebei Province, Langfang
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2020年 / 45卷 / 09期
关键词：
A-type granite; Cratonization; Early Neoarchean to late Paleoproterozoic; Fuping Complex; Geochemistry; P-T path; TTG gneisses;
D O I：
10.3799/dqkx.2020.240
中图分类号：
学科分类号：
摘要：
In this paper, we summarize the evolutionary history on Fuping Complex from the early Neoarchean to late Paleoproterozoic by comprehensive analyses of data collected on its geochemistry, zircon U-Pb dating, isotopic geochemistry and metamorphism. It is found that the protolith of ca. 2.7 Ga gneisses are tonalite with the geochemical features of TTG, and zircons in these gneisses show positive εHf(t) values of 5.44 to 7.50, with single stage model age (TDM) of 2 745-2 824 Ma, which indicates the intensive crustal growth in early Neoarchean in the Fuping Complex. The late Neoarchean gneisses yield the age of 2 543-2 484 Ma and are mainly composed of tonalite-trondjemite-granodiorite (TTG) besides some monzogranite. TTG gneisses have εNd(t) values ranging from -1.64 to +0.96, with single stage model age (TDM) of 2.76-3.04 Ga, and zircon εHf(t) of -1.9-+7.91, with single stage model age (THf1) and two stage model age (THf2) of 2 546-2 888 Ma and 2 548-3 119 Ma, respectively. Thus, these TTG are derived from partial melting of the early Neoarchean rocks with some addition of Mesoarchean crust. Gabbro coeval with TTG gneisses displays the features of island arc magma and ca. 2.5 Ga metamorphism in Neoarchean supracrustal rocks, suggesting that the Fuping Complex underwent subduction and arc-continent or continent-continent collision in late Neoarchean. 2.1-2.0 Ga granitoids widely occur in the Fuping Complex with the feartures of A-type granite and the simultaneous volcanic-sedimentary rocks formed intra-continental rift environment in middle Paleoproterozoic. Mafic granulite enclaves in the Fuping Complex yield metamorphic age of 1.89-1.85 Ga and show clockwise P-T paths, which represents closure of intra-continent rifts and cratonization of the North China Craton in late Paleoproterozoic. © 2020, Editorial Department of Earth Science. All right reserved.
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页码：3179 / 3195
页数：16
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