2" class=MsoNormal>2pt; mso-font-kerning: 18.0pt; mso-bidi-font-family: 宋体" lang=EN-US>Re-Os Dating of Molybdenites from the Cu-Mo-W Deposits in the Balkhash
详细信息
- 责任者：Chen Xuanhua (Key Laboratory of Neotectonic Movement and Geohazard ; Ministry of Land and Resources ; Beijijng 100081 ; China) ; Qu Wenjun
- 刊名：Acta Geologica Sinica
- 出版年：2010
- 卷期：84(9)
- 关键词：铜矿 ; copper ores ; 钼矿 ; molybdenum ores ; 钨矿 ; tungsten ores ; 哈萨克斯坦 ; Kazakhstan
- 页码：p.1333-1348
- 图表：10 illus., 2 tables, 47 refs.
- 分类号：1001
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
In this paper, 11 molybdenite samples from the western Balkhash metallogenic belt were selected for Re-Os isotopic dating. The molybdenites from the porphyritic Borly Cu-Mo deposit,and East Kounrad,Zhanet and Akshatau quartz-vein greisen W-Mo deposits,gave average model Re-Os ages of 315.9 Ma,298.0 Ma,295.0 Ma and 289.3 Ma,respectively. Re-Os dating of molybdenites indicates that the Cu-Mo-W metallogenesis in the western Balkhash metallogenic belt formed during Late Carboniferous to Early Permian （315.9289.3 Ma）,while the porphyry Cu-Mo deposits formed at 315.9 Ma,and quartz-vein greisen W-Mo deposits formed at 297.9 Ma. The Re-Os model and isochron ages suggest that Late Carboniferous porphyry granitoid and pegmatite magmatism during Late Hercynian movement. Comparing to the Juggar-East Tianshan porphyry Cu metallogenic belt in the northwestern China,the time of the Cu-Mo metallogenesis in Balkhash metallogenic belt,is between that of Tuwu-Yandong and Baogutu porphyry Cu deposits in East Tianshan and West Junggar. Concluded, the large-scale porphyry Cu-Mo metallogenesis in Central Metallogenic Domain centralized in Late Carboniferous due to Hercynian tectonic-magmatic activities.