Early Permian post-collisional magmatic events, East Junggar: Constraints from zircon SHRIMP U-Pb age, geochemistry and Hf isotope of rhyolite in the Yundukala area.
文献类型：期刊论文
| 作者 | Li Di1; He DengFa1; Fan Chun1; Xiang Kui2; Jin LuYing3 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013 |
| 卷号 | 29期号:1页码:317-337 |
| 关键词 | Geochemistry Zircon Shrimp U-pb Dating Hf Isotope Rhyolite Yundukala East Junggar |
| 文献子类 | Article |
| 英文摘要 | The magma source, petrogenesis, tectonic setting and its geochronology of the Middle-Late Paleozoic felsic volcanic rocks, which widely exposed in the Zhaheba area, East Junggar, remain not restriction well so far. A better understanding of these issues above will help us to reveal the magmatic processes and the continental growth of Central Asia. The field investigation showed significant structural characteristic with NE-SW trending compression and the Batamayineishan Formation is represented by typical basic and intermediate-felsic volcanic rocks and pyroclastic rocks. This paper reports zircon SHRIMP U-Pb age, whole-rock geochemistry and zircon Hf isotope analysis results from the Yundukala rhyolite, East Junggar. Three zircon SHRIMP U-Pb ages indicate that the rhyolite in the Yundukala area were formed at 276.0 similar to 279.8Ma. The rhyolites are rich in silica (SiO2 = 60.61% similar to 78.07%), alkali (K2O + Na2O = 6.46% similar to 9.28%) and have high Fe2O3T (0.70% similar to 3.30%) contents and Ga/Al ratios, low CaO (0.18% similar to 2.79%) and MgO (0.13% similar to 1.31%) contents, and it is a typical high-medium-K calc-alkaline A-type rhyolite with character of enrichment of LREE and HSFE (Zr, Hf) and depletion of Ba, Sr, Eu, Nb and Ta. They have high values of epsilon(Hf) (t) (10.3 similar to 14.6) and young crustal model ages (348 similar to 557Ma), suggesting that they were generated by partial melting of juvenile lower crust. Integrating regional geological data of the eastern Junggar and previous research on the nearest ophiolite belt, it is concluded that the Yundukala region was in an extensional setting in the Early Permian and the rhyofites may be the products of felsic magma during its ascend and emplacement processes when upwelling asthenosphere triggered partial melting of juvenile lower crust in an arc-arc or arc-continent post-collisional extensional setting, indicating that the vertical growth play an important role in the continental crust of Central Asia in the Early Permian. |
| WOS关键词 | A-TYPE GRANITES ; CARBONIFEROUS VOLCANIC-ROCKS ; PHANEROZOIC CRUSTAL GROWTH ; PALEOZOIC COPPER-DEPOSITS ; ASIAN OROGENIC BELT ; XINJIANG NW CHINA ; CONTINENTAL GROWTH ; NORTHERN XINJIANG ; TECTONIC EVOLUTION ; NORTHWEST CHINA |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000315130500025 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62661]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 作者单位 | 1.China Univ Geosci, Minist Educ, Key Lab Marine Reservoir Evolut & Hydrocarbon Acc, Beijing 100083, Peoples R China 2.SINOPEC, Shengli Oil Field Co, Xinjiang Explorat & Dev Ctr, Dongying 257017, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li Di,He DengFa,Fan Chun,et al. Early Permian post-collisional magmatic events, East Junggar: Constraints from zircon SHRIMP U-Pb age, geochemistry and Hf isotope of rhyolite in the Yundukala area.[J]. ACTA PETROLOGICA SINICA,2013,29(1):317-337. |
| APA | Li Di,He DengFa,Fan Chun,Xiang Kui,&Jin LuYing.(2013).Early Permian post-collisional magmatic events, East Junggar: Constraints from zircon SHRIMP U-Pb age, geochemistry and Hf isotope of rhyolite in the Yundukala area..ACTA PETROLOGICA SINICA,29(1),317-337. |
| MLA | Li Di,et al."Early Permian post-collisional magmatic events, East Junggar: Constraints from zircon SHRIMP U-Pb age, geochemistry and Hf isotope of rhyolite in the Yundukala area.".ACTA PETROLOGICA SINICA 29.1(2013):317-337. |
入库方式： OAI收割
来源：地质与地球物理研究所
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