LA-ICP-MS Zircon U-Pb Dating and Petrogenesis of Shenxianshui Granite in Gejiu, Yunnan Province , China
详细信息
- 责任者：Zhang Ying (State Key Laboratory of Ore Deposit Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Huang Zhilong
- 刊名：Acta Mineralogica Sinica
- 出版年：2011
- 卷期：31(3)
- 关键词：A型花岗岩 ; A-type granite ; 铀—铅计时 ; U-Pb dating ; 岩石地球化学 ; lithogeochemistry ; 云南 ; Yunnan Province
- 页码：p.515-524
- 图表：5 illus., 2 tables, 43 refs.
- 分类号：0801
- issnNo：ISSN1000-4734
- isbnNo：CN52-1045/P
摘要
The Gejiu in Yunnan Province, south China, is the largest felsic intrusion-related Sn-polymetallic ore field in the world. The Shenxianshui in western Gejiu district occurs as a stock, and consists of Si, alkali-rich, and Ca, Mg-poor alkali feldspar granite. Chondrite-normalized REE distribution pattern shows pronounced negative Eu anomaly and LREE enrichment. Bulk geochemistry characteristics indicate that the Shenxianshui is highly differentiated A-type granite. Zircon LA-ICP-MS Concordia age of （81.7 ±0.6） Ma indicates that the Shenxianshui granite occurred at Late Jurassic. Regional geology and bulk rock geochemistry indicate that the Shenxianshui alkali feldspar granite formed at an extensional tectonic setting during Late Yanshanian.