| 赵俊兴.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 |
| 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 MolybdenumDeposit in the Northern Margin of Gangdese and Comparison with TypicalPorphyry Molybdenum Deposits in the World |
| 投稿时间：2010-10-12 修订日期：2010-11-26 |
| DOI： |
| 中文关键词: 冈底斯北缘 沙让斑岩钼矿 蚀变 矿化 典型斑岩钼矿床对比 |
| 英文关键词: Northern Gangdese,Sharang porphyry molybdenum deposit,alteration,mineralization,comparison with typical porphyry molybdenum de鄄
posits |
| 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“十一五冶
科技支撑计划项目(编号:2006BA01A04)联合资助成果。 |
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| 中文摘要: |
| [摘要]西藏沙让大型斑岩型钼矿床系冈底斯多金属成矿带首例斑岩型钼矿床,产于印亚大陆碰
撞带的主碰撞期。本文分析了其蚀变和矿化特征,指出沙让钼矿床蚀变类型包括钾硅酸盐化(包括钾长
石化和黑云母化)、绿帘石-绿泥石化、硅化、绢英岩化(石英-绢云母-黄铁矿化)和粘土化(高岭土化和
伊利石-水白云母化)。矿化类型主要以脉状矿化、网脉状矿化和纹层状石英-辉钼矿脉为主,少量为浸
染状矿化、星点状矿化(分布在角砾岩的基质中)和微细辉钼矿脉状矿化。该矿地表以粘土化和绢英岩
化为主,剥蚀程度甚低,深部找矿潜力巨大。作者还选取世界部分典型斑岩型钼矿床进行蚀变和矿化特
征的系统对比,指出斑岩型钼矿床有其自身独特的蚀变分带和矿化特征,其中钾化和绢英岩化是与矿化
最为紧密的蚀变,而斑岩型钼矿具备特征的富氟的矿物蚀变带(如黄玉带或含萤石的蚀变带)。而矿体
的产出一般呈矿化壳的形式在成矿岩体上部呈披覆状水平产出,常见有多层矿体。多种矿化特征中以
网脉状矿化和纹层状石英-辉钼矿脉最为特征,常见有脉状蚀变和角砾岩化矿化。最后讨论了本项研究
对于冈底斯多金属成矿带的勘查工作和研究的意义,以及与印亚大陆碰撞带东侧斑岩钼矿产出联系的
可能性。 |
| 英文摘要: |
| Abstract:The large-scale Sharang porphyry molybdenum deposit, as the firstly discovered single molybdenum porphyry-type deposit in the Gangdese
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鄄
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依sulfide
(other gangue minerals) vein, and ribbon-textured quartz+molybdenite依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 al鄄
teration 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 por鄄
phyry 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 molybde鄄
num deposits in the eastern section of the India-Asia continental collision belt. |
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