中国地质Issue(2)：570-584,15.
西藏拉抗俄斑岩铜钼矿床辉钼矿Re-Os同位素测年及其地质意义
Re-Os dating of molybdenite from the Lakange porphyry Cu-Mo deposit in Tibet and its Geological Significance
摘要
Abstract
The Lakange porphyry Cu-Mo deposit in the Gangdise metallogenic belt of central and southern East Lhasa block within the Tethys tectonic domain is one of the key deposits in the Tibet Plateau geological survey project evaluation in recent years. Re-Os isotopic dating technique was applied for determination of mineralization events, and eight molybdenite samples were analyzed for Re-Os isotopic compositions, with the model ages obtained ranging from (13.20±0.20) Ma to (13.64±0.21) Ma, and the isochron age being(13.12 ± 0.44)Ma which represents the metallogenic age of the Lakange porphyry Cu-Mo deposit, indicating Miocene. The Re content of the molybdenite is 343.6 × 10-6-835.7 × 10-6, with an average of 557.8 × 10-6, suggesting that the metallogenic material originated from a source with mantle components. The Lakange porphyry Cu-Mo deposit was formed in a stretching background of India-Asia continental collision orogenic collision, the age (17-12 Ma) is identical with ages of numerous porphyry-skarn mineralization systems in the eastern of Gangdise metallogenic belt, and is 2-3 Ma younger than ages of the porphyry-skarn copper polymetallic deposits in the same ore concentration area, such as Jiama, Qulong and Bangpu, with the formation controlled by the same metallogenic geodynamics setting.关键词
地球化学/Re-Os同位素测年/成矿时代/拉抗俄/冈底斯/西藏Key words
geochemistry/Re-Os isotopic dating/metallogenic age/Lakange porphyry Cu-Mo deposit/Gangdise metallogenic belt/Tibet分类
天文与地球科学引用本文复制引用
冷秋锋,唐菊兴,郑文宝,张金树,唐攀,严刚,董宇..西藏拉抗俄斑岩铜钼矿床辉钼矿Re-Os同位素测年及其地质意义[J].中国地质,2015,(2):570-584,15.基金项目
中国地质调查局地质大调查项目（12120114050501,12120113093700）、国家自然科学基金项目（41302060）及国家973项目(2011CB403103)共同资助。 （2011CB403103）
