Petrogenesis and tectonic setting of the Middle Permian A-type granites in Altay, northwestern China: Evidences from geochronological, geochemical, and Hf isotopic studies
文献类型:期刊论文
作者 | Yunlong Liu; Hui Zhang; Yong Tang; Xin Zhang; Zhenghang Lv; Jingyu Zhao |
刊名 | Geological Journal |
出版日期 | 2018 |
卷号 | 53期号:2页码:527-546 |
英文摘要 | The Jiangjunshan and Dakalasu alkali-feldspar granites are located in the central part of the Chinese Altay orogen. In this paper, we present detailed geochemical, zircon U-Pb, and Hf isotopic data of these granites. The Jiangjunshan and Dakalasu alkali-feldspar granites show a high content of SiO2 (72.05-73.27 and 69.55-71.04wt%, respectively), total alkalis (Na2O+K2O=8.41-8.71 and 7.24-8.66wt%, respectively), and high-field strength elements (Zr+Nb+Ce+Y=400.3-482.9 and 156.7-339.3ppm, respectively), as well as high Ga/Al ratios (10,000xGa/Al=3.46-4.19 and 2.62-3.28, respectively) and depletion in Ba, Nb, Sr, and Ti, showing geochemical characteristics similar to those of A-type granites. Zircon U-Pb dating of the Jiangjunshan and Dakalasu alkali-feldspar granites yielded weighted mean dating Pb-206/U-238 ages of 268.3 +/- 1.9 and 270.4 +/- 1.9Ma, respectively, indicating that these granites intruded during the Permian. The Jiangjunshan and Dakalasu alkali-feldspar granites show highly variable zircon epsilon(Hf)(t) values ranging from -7.0 to +5.6, implying that these granites originated from a mixing of mantle-derived magma with crustal materials. Our data on the Jiangjunshan and Dakalasu alkali-feldspar granites, coupled with previous studies of Permian magmatism and metamorphism, suggest that the tectonic regime was in a postcollisional extensional environment in the Chinese Altay orogen during the Permian. Therefore, the change in stress from compression to extension and asthenospheric upwelling triggered by slab break-off plays a significant role in the generation of Jiangjunshan and Dakalasu alkali-feldspar granites. |
语种 | 英语 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/8684] |
专题 | 地球化学研究所_地球内部物质高温高压实验室 |
作者单位 | 1.University of Chinese Academy of Sciences, Beijing, China 2.Key Laboratory of High‐temperature and High‐pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China |
推荐引用方式 GB/T 7714 | Yunlong Liu;Hui Zhang;Yong Tang;Xin Zhang;Zhenghang Lv;Jingyu Zhao. Petrogenesis and tectonic setting of the Middle Permian A-type granites in Altay, northwestern China: Evidences from geochronological, geochemical, and Hf isotopic studies[J]. Geological Journal,2018,53(2):527-546. |
APA | Yunlong Liu;Hui Zhang;Yong Tang;Xin Zhang;Zhenghang Lv;Jingyu Zhao.(2018).Petrogenesis and tectonic setting of the Middle Permian A-type granites in Altay, northwestern China: Evidences from geochronological, geochemical, and Hf isotopic studies.Geological Journal,53(2),527-546. |
MLA | Yunlong Liu;Hui Zhang;Yong Tang;Xin Zhang;Zhenghang Lv;Jingyu Zhao."Petrogenesis and tectonic setting of the Middle Permian A-type granites in Altay, northwestern China: Evidences from geochronological, geochemical, and Hf isotopic studies".Geological Journal 53.2(2018):527-546. |
入库方式: OAI收割
来源:地球化学研究所
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