SHRIMP Zircon U-Pb Dating and Petrogeochemistry of Ordovician Granite Bodies in the Southern Segment of Gaoligong Mountains, Western Yunnan Province

详细信息   

• 责任者：Liu Qisheng (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Ye Peisheng
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31(2)
• 关键词：花岗岩 ; granite ; 地球化学 ; geochemistry ; 铀—铅计时 ; U-Pb dating ; 高黎贡山 ; Gaoligong Mountains
• 页码：p.250-257
• 图表：3 illus., 3 tables, 19 refs.
• 分类号：0801
• 出版序号：20130124
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

SHRIMP U-Pb dating of zircons from two representative samples of the batholith shows that the crystallization age is (473.5±2.9)　Ma and (461.5±7.3) Ma, respectively. Petrochemical and geochemical analyses show that the magma of the granite was derived mainly from the melting of the upper crest. The authors come to the conclusion that the emplacement and crystallization of the granite batholith had a close relationship with the collisional orogeny and crustal thickening and were also closely related to the crustal partial melting in the late period of the Pan-African orogeny.