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Petrogenesis of the Mesozoic Shuikoushan peraluminous I-type granodioritic intrusion in Hunan Province, South China: Middle–lower crustal reworking in an extensional tectonic setting
Jie-Hua Yang;  Jian-Tang Peng;  Yong-Fei Zheng;  Rui-Zhong Hu;  Xian-Wu Bi;  Jun-Hong Zhao;  Jin-Chuan Huang;  Bang-Lu Zhang
2016
Source PublicationJournal of Asian Earth Sciences
Volume123Pages:224-242
Abstract

The Mesozoic Shuikoushan granitoid intrusion in the Jiangnan orogen between the Yangtze and the Cathaysia blocks in southern Hunan Province, South China, provides an opportunity to probe deepcrustal composition and structure, and to investigate the geodynamic evolution of South China. The intrusion is composed of granodiorite with I-type geochemical affinities and contains zircon with an U–Pb concordant age of 158.3 ± 1.2 Ma. Rocks from the intrusion have variable SiO2 from 58.4 wt.% to 65.2 wt.%, Al2O3 from 15.0 wt.% to 17.2 wt.%, TiO2 from 0.57 wt.% to 0.76 wt.%, and P2O5 from 0.27 wt.% to 0.52 wt.%. They have A/CNK from 0.97 to 1.23 (1.04 on average) and are dominantly peraluminous. They are characterized by enrichment in LREE ([La/Sm]N = 3.47–5.19) and LIL (e.g., K, Rb) and depletion in HFSE (e.g., U, Th) in primitive mantle normalized trace element diagrams. These geochemical features indicate that the rocks are I-type granodiorites and have undergone extensive fractional crystallization of hornblende, biotite, titanite, and apatite. All samples show negative eHf(t) (10.6 to 8.1) and eNd(t) (5.92 to 6.13) values, with relatively high initial 87Sr/86Sr (ISr) (0.7101–0.7102) and d18O ratios (8.4–9.7‰). These values significantly differ from mantle values, suggesting that they are generated by the amphibole-dehydration melting of a mafic source in the middle-to-lower crust beneath the Jiangnan orogen. The emplacement of the Shuikoushan granitoid intrusion is contemporaneous with the late Jurassic to early Cretaceous extension within the Shi-Hang rift zone, indicating that it may have been formed under an extensional regime in response to both the Pacific superplume activity and westward subduction of the Pacific Plate. The extensional processes along with asthenosphere upwelling and basaltic underplating may have triggered the widespread late Jurassic granitoid intrusion in southern Hunan Province and possibly in South China.

KeywordPeraluminous I-type Granitoid shuikoushan Intrusion middle–lower Crustal Reworking extensional Setting south China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8712
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
3.School of Geosciences and Info-physics, Central South University, Changsha 410083, China
4.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
Recommended Citation
GB/T 7714
Jie-Hua Yang;Jian-Tang Peng;Yong-Fei Zheng;Rui-Zhong Hu;Xian-Wu Bi;Jun-Hong Zhao;Jin-Chuan Huang;Bang-Lu Zhang. Petrogenesis of the Mesozoic Shuikoushan peraluminous I-type granodioritic intrusion in Hunan Province, South China: Middle–lower crustal reworking in an extensional tectonic setting[J]. Journal of Asian Earth Sciences,2016,123:224-242.
APA Jie-Hua Yang;Jian-Tang Peng;Yong-Fei Zheng;Rui-Zhong Hu;Xian-Wu Bi;Jun-Hong Zhao;Jin-Chuan Huang;Bang-Lu Zhang.(2016).Petrogenesis of the Mesozoic Shuikoushan peraluminous I-type granodioritic intrusion in Hunan Province, South China: Middle–lower crustal reworking in an extensional tectonic setting.Journal of Asian Earth Sciences,123,224-242.
MLA Jie-Hua Yang;Jian-Tang Peng;Yong-Fei Zheng;Rui-Zhong Hu;Xian-Wu Bi;Jun-Hong Zhao;Jin-Chuan Huang;Bang-Lu Zhang."Petrogenesis of the Mesozoic Shuikoushan peraluminous I-type granodioritic intrusion in Hunan Province, South China: Middle–lower crustal reworking in an extensional tectonic setting".Journal of Asian Earth Sciences 123(2016):224-242.
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