高歌,朱杰勇,李科.滇西北衙金多金属矿床地质特征及成因探讨[J].地质找矿论丛,2019,34(2):179-186
滇西北衙金多金属矿床地质特征及成因探讨
Geological characteristics and genesis of Beiya gold polymetallic deposit in northwestern Yunnan province
投稿时间:2017-11-22  
DOI:10.6053/j.issn.1001-1412.2019.02.003
中文关键词:  金多金属矿  地质特征  富碱斑岩  矿床成因  滇西北衙
英文关键词:gold polymetallic ore  geological features  alkali-rich porphyry  deposit genesis  Beiya in western Yunnan province
基金项目:
作者单位
高歌 昆明理工大学国土资源工程学院, 昆明 650093 
朱杰勇 云南省新材料制备与加工重点实验室, 昆明 650093 
李科 昆明理工大学国土资源工程学院, 昆明 650093 
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中文摘要:
      文章基于北衙金多金属矿床野外地质调查基础上,结合同位素测年、矿物薄片鉴定等室内测试分析,着重对该矿床的地质特征、成矿年代、矿床成因进行了讨论。结果表明:①矿床主要赋存于三叠系中统北衙组碳酸盐岩与喜马拉雅期富碱斑岩的内外接触带上。②矿床的形成可划分为2个成矿期次和5个成矿阶段:Ⅰ期为内生成矿期,Ⅱ期为表生氧化成矿期。③区内SN向、EW向断裂控制着矿体的分布,成矿控制显著。④通过辉钼矿Re-Os同位素测年、锆石测年等方法精确测定了成岩成矿年龄,反映了成矿年龄和富碱斑岩形成的一致性。⑤区内蚀变可分为3带:"黄绿带"、"浅红带"、"灰白带",其中"黄绿带"为主要的金多金属矿化带。⑥北衙金多金属矿床属于与喜马拉雅期富碱斑岩有关的矽卡岩-斑岩型金多金属矿床。
英文摘要:
      Based on the field geological survey, combined with isotope dating and thin section identification, the geological characteristics, metallogenic age and genesis of the deposit were studied. The results show that:① the deposit occurs mainly in the inner and outer contact zones of the carbonate rock of Beiya Formation of Middle Series of Triassic System and the Himalayan period Alkali-rich porphyry; ② metallogenetically the deposits can be divided into two periods and five stages and period I is endogenic mineralization and period I oxidation; ③ the distribution of ore bodies is clearly controlled by SN and EW faults; ④ the age of Re-Os dating on molybdenite and U-Pb dating on zircon is coincided with that of the alkali-rich porphyry; ⑤alteration can be divided into "yellow green zone", "light red zone", "gray zone", of which the "yellow green zone" is the main gold polymetallicl mineralization zone; ⑥the deposit belongs to the skarn-porphyry gold polymetallic deposit related to the alkali-rich porphyry.
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