Geochronology of the Dasongpo Tin Deposit, Yunnan Province: Evidence from Zircon LA-ICP-MS U-Pb Ages and Cassiterite LA-MC-ICP-MS U-Pb Age
详细信息
- 责任者：Ma Nan (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Deng Jun
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(4)
- 关键词：锡矿 ; tin ores ; 铀—铅计时 ; U-Pb dating ; 云南 ; Yunnan Province
- 页码：p.1223-1235
- 图表：illus., 3 tables, 85 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
mary" name="EnDivSummary">The Dasongpo tin deposit is located in Tengchong-Lianghe Sn-W metallogenic belt in the Sanjiang Tethys metallogenic domain, which is related to Guyong batholith. In the Dasongpo tin deposit, the Xiaolonghe biotite-granite and monzogranite yielded zircon U-Pb ages of 71.5±2.1Ma～75.3±4.2Ma, and 70.3±3.2Ma respectively, likely represents crystallization age of magma. Few researches have reported on the cassiterite LA-MC-ICP-MS U-Pb dating in China and overseas. In order to constrain the timing of metallogenic age better, we carried out cassiterite U-Pb dating for the greisen-type ore with age of 75.5±2.6Ma. The ages of the Xiaolonghe tin-bearing granitoid are similar with those of the Guyong batholith, indicating the tin-bearing granitoid as a part of the Guyong batholith. Metallogenic age is similar with that of tin-bearing granitoid, indicating their formation at the same time from the subduction of the Neo-Tethys Ocean.