陕西省金堆城钼矿床碲、铋矿物的赋存状态及其地质意义
孙衍东，尹京武*，张振华，赵 飞，张 飘，王梦亚，高宇威，严芳玲陕西省金堆城钼矿床碲、铋矿物的赋存状态及其地质意义
孙衍东1，尹京武1*，张振华1，赵 飞1，张 飘1，王梦亚1，高宇威1，严芳玲2
（1.中国地质大学（北京）科学研究院，北京 100083；2.金堆城钼业股份有限公司，陕西 洛南 726104）
摘 要 本文利用电子探针微束分析技术，对陕西省华县金堆城斑岩型钼矿床中产出的矿物组成及赋存状态进行了较为系统的研究，经研究发现，矿床中有较多碲、铋矿物的存在。主要包括：碲银矿、针硫铋铅矿、含硫铋铅银矿及含铋、银-方铅矿。碲银矿主要呈半自形粒状，与针硫铋铅、含硫铋铅银矿及含铋、银-方铅矿共生并被黄铁矿所包裹；针硫铋铅矿呈自形粒状被黄铁矿包裹并与黄铜矿、碲银矿等矿物共生；含硫铋铅银矿有两种不同的产出状态：第一，以自形粒状形态与黄铜矿、闪锌矿及碲银矿共生形成复杂共生体，第二，以较小的颗粒被黄铁矿包裹；含铋、银-方铅矿呈自形-半自形粒状与黄铜矿、闪锌矿、碲银矿及含硫铋铅银矿密切共生。其中，碲银矿的出现暗示了成矿流体是幔源成因；含铋、银-方铅矿从核部到边部Ag、Bi的含量有逐渐上升，而Pb的含量有逐渐下降的趋势，反映出了其晶格中发生了Ag+、Bi3+替代Pb2+的作用。
关键词 金堆城；碲; 铋矿物；电子探针
中图分类号：P618；P618.6；P575.1 文献标识码：A doi:10.3969/j.issn.1000-6281.2016.06.006
Occurrence and geological significance of telluride or bismuth minerals in the Jinduicheng porphyry Mo deposit, Shanxi Province
SUN Yan-dong1，YIN Jing-wu1*，ZHANG Zheng-hua1，ZHAO Fei1，ZHANG Piao1，WANG Meng-ya1，
GAO Yu-wei1，YAN Fang-ling2
- Institute of Earth Science，China University of Geosciences，Beijing 100083；2. Jinduicheng molybdenum co., LTD.，
Luonan Shaanxi 726104，China）
Abstract A systematic study is carried out by means of the Electron Probe Micro Analysis (EPMA) on mineral composition and occurrence state of Jinduicheng porphyry Mo deposit, Shanxi Province. The results show that there are some tellurium or bismuth minerals in the deposit which mainly include: hessite, aikinite, schirmerite and Bi- and Ag-bearing galena. Hessite wrapped by pyrite mainly forms subhedral grains intergrowth with aikinite, schirmerite and Bi- and Ag- bearing galena; Aikinite covered by pyrite usually forms euhedral intergrowth with chalcopyrite and hessite; Schirmerite have two states: Firstly, in euhedral granular with chalcopyrite, sphalerite and hessite constitutes complex symbiont; Secondly, in small particle is surrounded by pyrite; Bi- and Ag- bearing galena mainly forms euhedral-subhedral grains intergrowth with chalcopyrite, sphalerite, hessite and schirmerite. The emergence of hessite implies that the ore-forming fluid is mantle origin; In the Bi- and Ag-bearing galena, from the core to the margin, the content of Ag and Bi has a rising trend, while the content of Pb gradually declines. The phenomenon reveals the substitution of Ag+, Bi3+ replace Pb2+in Bi- and Ag-bearing galena.
Keywords Jinduicheng；telluride or bismuth minerals；electron probe micro analysis (EPMA)
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