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Zircon U–Pb ages and Hf–O isotopes, and whole-rock Sr–Nd isotopes of the Bozhushan granite, Yunnan province, SW China: Constraints on petrogenesis and tectonic setting
Xiao-Cui Chen;  Rui-Zhong Hu;  Xian-Wu Bi;  Hong Zhong;  Jiang-Bo Lan;  Cheng-Hai Zhao;  Jing-Jing Zhu
2015
Source PublicationJournal of Asian Earth Sciences
Volume99Pages:57-71
Abstract

The Bainiuchang silver-polymetallic ore deposit is a super-large deposit in the western part of the South China tungsten–tin province (or the Nanling tungsten–tin province). The deposit is spatially and temporally associated with the Bozhushan granite pluton. Our new data indicate that the Bozhushan granitoids formed at 86–87 Ma. The granitoids are geochemically consistent with A-type granite. The Bozhushan pluton consists predominantly of biotite granite that is characterized by weakly peraluminous to metaluminous compositions and high alkali contents (Na2O+K2O = 7.51–9.06 wt.%). The granitic rocks are enriched in large-ion lithophile elements (LILE) Rb, Th, U, and K, but relatively depleted in Ba and Sr. In addition, they have high Zr + Nb + Ce + Y contents (310–478 ppm) and high 10,000 Ga/Al ratios (2.7–3.1). The temperatures of the parental magmas for the Bozhushan granites are estimated to be 790–842 C based on the zircon saturation thermometer. Isotopically, the Bozhushan granites are characterized by elevated initial 87Sr/86Sr ratios (0.7126–0.7257) and low eNd values (11.2 to 12.4), and high d18O values (7.91–9.58‰) and low eHf values (9.5 to 6.1) for zircon crystals, which indicate a dominant continental crustal source. The two-stage Hf model ages vary from 1.53 to 1.86 Ga. The isotopic compositions support the interpretation that the granitic rocks formed by melting of the Meso- and Neoproterozoic metasedimentary basements of the Cathaysia block. These results, together with geological records in the other parts of the western Cathaysia block, suggest that the formation of the Bozhushan A-type granites is related to lithospheric extension and asthenospheric upwelling that are associated with the change of plate motion in Late-Cretaceous. 201

KeywordA-type Granite zircon U–pb Dating zircon Hf–o Isotope sr–nd Isotope lithospheric Extension western Cathaysia Block
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8708
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposits Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550005, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Xiao-Cui Chen;Rui-Zhong Hu;Xian-Wu Bi;Hong Zhong;Jiang-Bo Lan;Cheng-Hai Zhao;Jing-Jing Zhu. Zircon U–Pb ages and Hf–O isotopes, and whole-rock Sr–Nd isotopes of the Bozhushan granite, Yunnan province, SW China: Constraints on petrogenesis and tectonic setting[J]. Journal of Asian Earth Sciences,2015,99:57-71.
APA Xiao-Cui Chen;Rui-Zhong Hu;Xian-Wu Bi;Hong Zhong;Jiang-Bo Lan;Cheng-Hai Zhao;Jing-Jing Zhu.(2015).Zircon U–Pb ages and Hf–O isotopes, and whole-rock Sr–Nd isotopes of the Bozhushan granite, Yunnan province, SW China: Constraints on petrogenesis and tectonic setting.Journal of Asian Earth Sciences,99,57-71.
MLA Xiao-Cui Chen;Rui-Zhong Hu;Xian-Wu Bi;Hong Zhong;Jiang-Bo Lan;Cheng-Hai Zhao;Jing-Jing Zhu."Zircon U–Pb ages and Hf–O isotopes, and whole-rock Sr–Nd isotopes of the Bozhushan granite, Yunnan province, SW China: Constraints on petrogenesis and tectonic setting".Journal of Asian Earth Sciences 99(2015):57-71.
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