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Generation of post-collisional normal calc-alkaline and adakitic granites in the Tongbai orogen, central China

文献类型：期刊论文

作者Zhang, Wen-Xiang1; Zhu, Liu-Qin1,2; Wang, Hao3; Wu, Yuan-Bao1
刊名LITHOS
出版日期2018
卷号296页码:513-531
关键词Tongbai Orogen Post-collisional Setting Adakitic Granites Normal Granites Zircon U-pb Ages Sr-nd-hf-o Isotopes
ISSN号0024-4937
DOI10.1016/j.lithos.2017.11.033
文献子类Article
英文摘要Post-collisional granites are generally generated by partial melting of continental crust during orogenic extension. The occurrence of normal calc-alkaline granites following adaldtic granites in a collisional orogen is frequently supposed as a sign of tectonic regime transition from compression to extension, which has been debated yet. In this paper, we present a comprehensive study of zircon U-Pb ages, Hf-O isotopes, as well as whole-rock major and trace elements and Sr-Nd isotopes, for Tongbai and Jigongshan post-collisional granitic plutons in the Tongbai orogen. Zircon U-Pb dating yields intrusion ages of ca. 140 and 135 Ma for the Tongbai and Jigongshan plutons, respectively, suggesting they are post-collisional granites. These granites are high-K calc-alkaline series, metaluminous to weakly peraluminous with A/CNK ratios of 0.85-1.08. The Tongbai gneissic granites are normal calc-alkaline granite, having variable SiO2 (61.93-76.74 wt%) and Sr/Y (2.9-38.9) and (La/Yb)(N) (1.7-30.1) ratios with variably negative Eu anomalies (0.41-0.92). They have relatively high initial Sr isotope ratios of 0.707571 to 0.710317, and low epsilon(Nd)(t) (-15.74 to -11.09) and epsilon(Hf)(t) (-17.6 to -16.9) values. Their Nd and Hf model ages range from 22 to 1.8 Ga and 23 to 2.2 Ga. On the contrary, the Jigongshan granites show higher SiO2 (66.56-72.11 wt%) and Sr/Y (30.1-182.0) and (La/Yb)(N) (27.4-91.4) ratios with insignificant Eu anomalies (0.73-1.00), belonging to adakitic granite. They have 1(sr) = 0.707843-0.708366, epsilon(Nd)(t) = -19.83 to -17.59, and epsilon(Hf)(t) = -26.0 to -23.5. Their Nd and Hf model ages vary from ca. 2.5 to 2.4 Ga and ca. 2.8 to 2.6 Ga. The Tongbai and Jigongshan granites are characterized by mantle-like zircon delta O-18 values (5.17-5.46 parts per thousand). These geochemical features suggest that the Tongbai and Jigongshan granites were derived from partial melting of Paleoproterozoic and Archean continental crust, respectively. Fractional crystallization affected the geochemical compositions of the Tongbai gneissic granites, while the compositions of the Jigongshan granites were mainly controlled by partial melting. The adakitic signatures of the Jigongshan granites were either inherited from their source or ascribed to more garnet in their residues. The voluminous post-collisional granites might form by the collapse of the thickened Tongbai orogenic root. The normal Tongbai gneissic granites occurred slightly earlier than the Jigongshan adakitic granites in the Tongbai orogen, suggesting that it is not a mandate to sign the tectonic transition from adakitic to normal calc-alkaline granites in post-collisional settings. Therefore, this study provides another example supporting the burst of voluminous post-collisional granites with different compositions as a consequence of the collapse of the thickened orogenic roots of collisional orogens. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词ZIRCON U-PB ; EAST-CENTRAL CHINA ; THICKENED CONTINENTAL-CRUST ; HF ISOTOPE COMPOSITION ; EARLY CRETACEOUS GRANITOIDS ; PRESSURE METAMORPHIC ROCKS ; PLASMA-MASS SPECTROMETRY ; NORTHERN DABIE COMPLEX ; TECTONIC EVOLUTION ; GEOCHEMICAL CONSTRAINTS
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000423890600033
出版者ELSEVIER SCIENCE BV
资助机构Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 2015CB856106) ; 41573047 ; 41573047 ; 41273035) ; 41273035) ; Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 2015CB856106) ; 41573047 ; 41573047 ; 41273035) ; 41273035) ; Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 2015CB856106) ; 41573047 ; 41573047 ; 41273035) ; 41273035) ; Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; Ministry of Science and Technology of the People's Republic of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 2015CB856106) ; 41573047 ; 41573047 ; 41273035) ; 41273035)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82631]  
专题中国科学院地质与地球物理研究所
通讯作者Wu, Yuan-Bao
作者单位1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
2.First Geol Brigade Hubei Geol Bur, Huangshi 435100, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Wen-Xiang,Zhu, Liu-Qin,Wang, Hao,et al. Generation of post-collisional normal calc-alkaline and adakitic granites in the Tongbai orogen, central China[J]. LITHOS,2018,296:513-531.
APA Zhang, Wen-Xiang,Zhu, Liu-Qin,Wang, Hao,&Wu, Yuan-Bao.(2018).Generation of post-collisional normal calc-alkaline and adakitic granites in the Tongbai orogen, central China.LITHOS,296,513-531.
MLA Zhang, Wen-Xiang,et al."Generation of post-collisional normal calc-alkaline and adakitic granites in the Tongbai orogen, central China".LITHOS 296(2018):513-531.

入库方式： OAI收割

来源：地质与地球物理研究所

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