Molybdenite Re-Os Isotope Age of the Donggebi Mo Deposit and the Indosinian Metallogenic Event in Eastern Tianshanmas-microsoft-com:office:office" />
详细信息
- 责任者：Wu Yanshuang (Xinjiang Research Center for Mineral Resources ; Xinjiang Institute of Ecology and Geography ; Chinese Academy of Sciences ; Urumqi 830011 ; China) ; Xiang Nan
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(1)
- 页码：p.121-130
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
mary name="EnDivSummary">The Donggebi giant Mo deposit is located in the Qoltag metallogenic belt,eastern Tianshan,Xinjiang. Eight molybdentie samples from the deposit yield Re-Os isotope ages ranging from 228.7±2.7Ma to 241.7±0.9Ma,with an isochron age of 231.9±6.5Ma (95% confidence,MSWD=0.71) ,and a weighted mean age of 238. 5±3.7Ma (95% confidence,MSWD=5.8) . The lowest molybdenite Re-Os age (228.7±2.7Ma) agrees well with the age (227.6±1.3Ma) of the parental porphyritic granite at the deposit,indicating that the magmatism and Mo-mineralization occurred in Triassic. The Re contents in seven molybdenite samples range from 26. 51×10-6 to 91.34 ×10-6 ,suggesting that the ore-forming metals were mainly sourced from an immature continental crust which was likely formed in Paleozoic subduction-related accretion. Compiling of the available isotope ages obtained from the mineral systems in eastern Tianshan area shows that the Indosinian mineralization was significant in the eastern Tianshan orogenic belt. The Indosinian mineralization occurred in continental collision regime.