地质与勘探2011，Vol.47Issue(1)：54-70,17.
冈底斯北缘沙让斑岩钼矿蚀变矿化特征及与典型斑岩钼矿床的对比
Characteristics of Alteration and Mineralization in the Sharang Pophyry Molybdenum Deposit in the Northern Margin of Gangdese and Comparison with Typical Porphyry Molybdenum Deposits in the World
摘要
Abstract
The large-scale Sharang porphyry molybdenum deposit, as the firstly discovered single molybdenum porphyry-type deposit in the Cangdese metallogenic belt, formed in the main-stage of India-Asia continental collision with distinct characteristics of alteration and mineralization. The alteration types include potassic-silicate alteration ( K-feldspathization and biotitization), chlorite-epidote alteration, silicification, phyllic alteration (quartz-seri-cite-pyrite alteration) and argillic alteration (mainly Kaolinitization and illite - hydromuscovitization, always overlapping the silicic zone and phyllic zone). The main characteristics of mineralization, most founded in the ore district, are molybdenite-bearing vein, stockwork quartz+molybdenite±sulfide (other gangue minerals) vein, and ribbon-textured quartz+molybdenite±pyrite vein. Less disseminated mineralization, pure molybdenite veinlets and spotted mineralized matrix in the magmatic-hydrothermal breccias are observed in the Sharang area. As the phyllic zone and argillic zone are both main alteration types in the field study of Sharang, low erosion level of this porphyry deposit suggests great potential for the exploration. Additionally, several world-wide, typical porphyry molybdenum deposits are selected for the comparison and discussion of their characteristics of alteration and mineralization in this paper. It is concluded that both of potassic-silicate alteration and phyllic alteration have the major tight connection with mineralization in the most porphyry molybdenum deposits, and some alteration zones consist of fluorine-bearing minerals, such as the topaz zone in Henderson and fluorite-bearing zone in Donggou. The comparisons also indicate that the geometries of orebodies in most porphyry molybdenum deposits have been found as layers of coating ore -shell (or called inverted-cup) in the top of ore-forming intrusion. Among the orebodies, the main patterns of mineralization are stockwork and ribbon -textured quartz+molybdenite veins, and both vein-type and breccia-related mineralization are set to the second place. At the end, this work makes some suggestions for further exploration in the Gangdese metallogenic belt, and discusses the possible connection between Sharang and other porphyry molybdenum deposits in the eastern section of the India-Asia continental collision belt.关键词
冈底斯北缘/沙让斑岩钼矿/蚀变/矿化/典型斑岩钼矿床对比Key words
Northern Cangdese, Sharang porphyry molybdenum deposit, alteration, mineralization, comparison with typical porphyry molybdenum deposits分类
天文与地球科学引用本文复制引用
赵俊兴,秦克章,李光明,李金祥..冈底斯北缘沙让斑岩钼矿蚀变矿化特征及与典型斑岩钼矿床的对比[J].地质与勘探,2011,47(1):54-70,17.基金项目
本文得到全国危机矿山替代资源找矿综合研究项目(编号:20089932)、国家自然科学基金(编号:40772066)和国家"十一五"科技支撑计划项目(编号:2006BA01A04)联合资助成果. （编号:20089932）
