| 巴颜喀拉山东段花岗岩锆石SHRIMP定年及其地球化学特征 |
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| 关键词:eastern part of Bayan Har Mountains granites intracontinental orogenics Zircon SHRIMP age |
| 基金项目:国家地质大调查计划“青海省达日县、久治县幅1∶25万区域地质调查”项目(编号:20031300009) |
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| Zircon SHRIMP Dating and Geochemical Characteristics of Granites in the Eastern Part of the Bayan Har Mountains |
| In the eastern part of the Bayan Har Mountains, granites with the SHRIMP U-Pb age of 218197 Ma directly intruded folded Triassic strata and are unconformably covered by Jurassic Nianbao Formation. These granites, composed of granodiorite, adamellite and syenogranite, have porphyritoid or porphyritic texture and abundant aluminum and potassium. In addition, they are characterized by lots of biotites, some aluminum-rich minerals such as garnets and tourmalines, and some gray fine dioritic inclusions. With A/CNK 1.001.22, they should belong to CPG-type granite in Barbarin's classification. They were formed at the late stage of Bayan Har intracontinental orogenic activity. |
| SHA Shu-qing,WANG Zong-xiu,GUO Tong-zhen,XIAO Wei-feng,YANG Xin-de.2007.Zircon SHRIMP Dating and Geochemical Characteristics of Granites in the Eastern Part of the Bayan Har Mountains[J].Acta Geoscientica Sinica,28(3):261-269. |
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