Re-Os Dating of Molybdenite from Tianbaoshan Polymetallic Orefield in Yanbian and Its Geological Significance
详细信息
- 责任者：Zhang Yong (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Sun Jinggui
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(2)
- 关键词：钼矿 ; molybdenum ores ; 多金属矿 ; polymetallic ores ; 铼—锇计时 ; Re-Os dating ; 吉林 ; Jilin Province
- 页码：p.427-435
- 图表：illus., 3 tables, 54 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The Tianbaoshan orefield,a large hydrothermal polymetallic(lead,zinc,copper,molybdenum)orefield in Yanbian,is composed of Xinxing lead-zinc deposit,Lishan lead-zinc-copper deposit and Dongfeng lead-zinc-copper-molybdenum deposit.On the basis of geological features,the authors carried out Re-Os dating,and the results show that the Re content of the molybdenite varies from 0.353×10-6 to 9.306×10-6,the model ages range from 174.7 to 200.3 Ma with the weighted mean age being(194.6±3.9)Ma and the isochron age bring(196.6± 2.5)Ma(MSWD=0.94,n=9).These data indicate that molybdenum mineralization took place in early Jurassic,and the geodynamic setting was closely related to the extension from the continental collision between the North China Plate and the Siberia Plate.The ore-forming materials might have been derived mainly from the crust.Combined with the high precision chronologic data of regional intrusions,the authors have arrived at the conclusion that Mo mineralization of the middle and east part of Jilin Province can be divided into 2 epochs:Early Jurassic(196.6~186 Ma)and Middle Jurassic(176.9~166.9 Ma),with the Middle Jurassic epoch having stronger mineralization.