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Geochronology and geochemistry of the TTG and potassic granite of the Taihua complex, Mts. Huashan: Implications for crustal evolution of the southern North China Craton
Wang, Guo-Dong1,2; Wang, Hao Y. C.2; Chen, Hong-Xu2; Zhang, Bo3; Zhang, Qing4; Wu, Chun-Ming2
2017
发表期刊PRECAMBRIAN RESEARCH
卷号288页码:72-90
文章类型Article
摘要Tonalite-trondhjemite-granodiorite (TTG) suite and potassic granite volumetrically expose in the Neoarchean to Paleoproterozoic Taihua complex, Mts. Huashan region, southernmost segment of the Trans-North China Orogen (TNCO). Zircon U-Pb dating on the trondhjemite, granitic gneiss, K-feldspar granite and coarse-grained granite samples show three episodes of magmatism (2.55-2.49 Ga, 2.33-2.25 Ga and 1.87-1.80 Ga) with distinct geochemical features in this area during the Paleoproterozoic. The trondhjemite samples have high SiO2 (67.46-71.73 wt%), Na2O (4.83-5.95 wt%), low Mg# (31-40) and HREE contents, with moderate (La/Yb)(N) values (16.8 to 35.3) and Sr/Y ratios (15.8 to 34). The potassic granite samples show high SiO2 (65.2-75.43 wt%), K2O (3.9-8.6), low Na2O (1.74-4.17 wt%), Mg# (2-46) and HREE contents, with moderate to high (La/Yb)(N) values (10.3 to 226) and Sr/Y ratios (12.8 to 208). All these granitoid samples are characterized by high SiO2 and low Mg#, Cr, Ni with moderate to high (La/Yb)(N) values and Sr/Y ratios. The absence of evidence of any pre-existing high Sr/Y and La/Yb sources in this region led to that the granitoids probably generated from partial melting of hydrous mafic rocks with garnet and amphibole in the residue. Therefore, partial melting of thickened lower curst is the most likely origin. Combined with previous studies, the first episodic magmatism (2.55-2.49 Ga) represented by TTG and granitic gneisses with positive whole rock epsilon(Nd)(t) and zircon epsilon(Hf)(t) values is interpreted as melts from partial melting of juvenile thickened lower crust. The second episodic magmatism (2.33-2.25 Ga) represented by TTG, granitic gneisses and K-feldspar granite with positive to negative whole rock epsilon(Nd)(t) and zircon epsilon(Hf)(t) values is suggested as the product of partial melting of both juvenile and pre-existing crustal material. The third episodic magmatism (1.87-1.80 Ga) is represented by these potassic granites, which is synchronism with the metamorphism recorded in this region and probably resulted from partial melting of pre-existing crustal materials in a syn-orogenic or post-orogenic setting during the collision between the Eastern and Western Blocks of the North China Craton. Multistage continental accretion (at 2.84-2.72 Ga, 2.57-2.43 Ga and 2.36-2.25 Ga) and reworking (at 2.36-2.25 Ga, 2.19-2.07 Ga and 1.87-1.80 Ga) occurred in the southern segment of the TNCO from Neoarchean to Paleoproterozoic. Transformation from an Andean-type continental margin arc setting on the western margin of the Eastern Block to continent-arc-continent collision in the southern TNCO during Late Neoarchean to Late Paleoproterozoic is suggested in this paper. (C) 2016 Elsevier B.V. All rights reserved.
关键词Ttg Potassic Granite Geochronology Geochemistry Taihua Complex North China Craton
DOI10.1016/j.precamres.2016.11.006
收录类别SCI
语种英语
WOS记录号WOS:000392555900004
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/136280
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, POB 4588, Beijing 100049, Peoples R China
3.China Corp Coal Geol Engn, Beijing 100040, Peoples R China
4.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China
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Wang, Guo-Dong,Wang, Hao Y. C.,Chen, Hong-Xu,et al. Geochronology and geochemistry of the TTG and potassic granite of the Taihua complex, Mts. Huashan: Implications for crustal evolution of the southern North China Craton[J]. PRECAMBRIAN RESEARCH,2017,288:72-90.
APA Wang, Guo-Dong,Wang, Hao Y. C.,Chen, Hong-Xu,Zhang, Bo,Zhang, Qing,&Wu, Chun-Ming.(2017).Geochronology and geochemistry of the TTG and potassic granite of the Taihua complex, Mts. Huashan: Implications for crustal evolution of the southern North China Craton.PRECAMBRIAN RESEARCH,288,72-90.
MLA Wang, Guo-Dong,et al."Geochronology and geochemistry of the TTG and potassic granite of the Taihua complex, Mts. Huashan: Implications for crustal evolution of the southern North China Craton".PRECAMBRIAN RESEARCH 288(2017):72-90.
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