| 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 Zhaoa; Jing-Jing Zhu
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| 2015
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Source Publication | Journal of Asian Earth Sciences
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Volume | 99Issue:1Pages: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 meta-luminous 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 10,000x Ga/Al ratios (2.7-3.1). The temperatures of the parental magmas for the Bozhushan granites are estimated to be 790-842 degrees C based on the zircon saturation thermometer. Isotopically, the Bozhushan granites are characterized by elevated initial Sr-87/Sr-86 ratios (0.7126-0.7257) and low epsilon Nd values (-11.2 to -12.4), and high delta O-18 values (7.91-9.58 parts per thousand) and low epsilon(Hf) 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 Neo-proterozoic 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. |
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Subject Area | 矿床地球化学
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Indexed By | SCI
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Language | 英语
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Document Type | 期刊论文
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Identifier | http://ir.gyig.ac.cn/handle/352002/5967
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Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室
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Corresponding Author | Rui-Zhong Hu |
Recommended Citation GB/T 7714 |
Xiao-Cui Chen,Rui-Zhong Hu,Xian-Wu Bi,et al. 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(1):57-71.
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APA |
Xiao-Cui Chen.,Rui-Zhong Hu.,Xian-Wu Bi.,Hong Zhong.,Jiang-Bo Lan.,...&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(1),57-71.
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MLA |
Xiao-Cui Chen,et al."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 99.1(2015):57-71.
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