| 东昆仑早古生代花岗岩锆石U-Pb年龄及其地质意义 |
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| 关键词:granites zircon U-Pb age Early Paleozoic Wulonggou area East Kunlun orogenic belt |
| 基金项目:中国地质调查局国土资源大调查项目(编号: 1212010711510; 1212011120182);科技部国际科技合作重点项目(编号: 2006DFB211330) |
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| Zircon U-Pb Dating of Early Paleozoic Granites from the East Kunlun Mountains and Its Geological Significance |
| Zircon U-Pb dating was conducted for four granite bodies in Wulonggou area by LA-MC-ICPMS. The mylonitized monzogranite (sample B20-14) from the middle of Huanglonggou yielded an average zircon U-Pb age of (417.7±2.0) Ma, the mylonitized monzogranite (sample B21-2) from the upper part of Huanglonggou yielded an average zircon U-Pb age of (419.7±2.3) Ma, the middle-coarse grained monzogranite (sample B20-8) from Shenshuitan yielded an average zircon U-Pb age of (419.9±2.0) Ma, and the middle-coarse grained monzogranite (sample B25-9) from the middle of Hongqigou yielded an average zircon U-Pb age of (419.0±2.0) Ma. These ages should represent the formation epoch of the four granite bodies in Wulonggou area i.e., Late Silurian, and thus record magmatic activities of the Early Paleozoic period. It is held that granites of the late Silurian period in Wulonggou area might have been concerned with the collisional orogeny after the closure of the Early Paleozoic Ocean. The discovery of 1861 Ma and 1666 Ma zircons of the Palaeoproterozoic epoch in the granite shows that the metamorphic basement materials of the East Kulun orogenic belt should be of Palaeoproterozoic period. |
| LU Lu,ZHANG Yan-lin,WU Zhen-han,HU Dao-gong.2013.Zircon U-Pb Dating of Early Paleozoic Granites from the East Kunlun Mountains and Its Geological Significance[J].Acta Geoscientica Sinica,34(4):447-454. |
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