摘要
为探讨鲁西铜石地区归来庄金矿和卓家庄金矿的成矿物质来源及成矿机制,利用显微镜和电子探针对矿石中典型碲化物矿物进行了分析研究。结果显示,碲化物矿物主要为自然碲和碲银矿,其次是针碲金银矿、AgAu_2Te_6、含银自然金和碲铅矿,初步认为AgAu_2Te_6为新矿物。针碲金银矿、AgAu_2Te_6、部分碲银矿、含银自然金可能是在非平衡状态下快速沉淀而成,与含矿流体的间歇性沸腾作用有关。碲化物的沉淀顺序反映了其各自熔化温度的差异,说明熔点高的碲化物将优先沉淀。矿床成矿热液具有多来源性,可能存在含Au、Ag流体和Te流体,二者在一定的条件下发生不混溶;流体沸腾作用可能是导致碲化物和金等成矿物质快速沉淀的主要机制。
The typical telluride minerals from the Guilaizhuang and Zhuojiazhuang gold deposits in the Tongshi area of western Shandong province were analyzed by electron probe microanalyzer(EPMA) in this study. The main telluride minerals in this area are native tellurium and hessite, and then sylvanite, AgAu2Te6, silver-bearing native gold and altaite. AgAu2Te6 might be a new mineral that has not been reported. Sylvanite, AgAu2Te6, hessite and silver-bearing native gold might have been precipitated rapidly due to the boiling of ore-forming fluids. The precipitation sequence of tellurides is consistent with their melting temperature, indicating that telluride with high melting point will be crystallized early. The ore-forming fluids in this area have been formed by two fluids: Au-Ag-rich fluid and Te-rich fluid. These two fluids were immiscible under certain conditions. Fluid boiling may act as the dominant mechanism leading to the rapid precipitation of telluride and gold.
作者
孙雨沁
于学峰
单伟
李增胜
熊玉新
李大鹏
舒磊
迟乃杰
程伟
李敏
SUN Yu-qin;YU Xue-feng;SHAN Wei;LI Zeng-sheng;XIONG Yu-xin;LI Da-peng;SHU Lei;CHI Nai-jie;CHENG Wei;LI Min(Shandong Institute of Geological Sciences, Key Laboratory of Gold Mineralization Processes and Resource Utilization. Subordinated to lhe Ministry of Land and Resources, Key Laboratory of Metallogenic Geological Process and Resources Utilization in Shandong Province, Jinan 250013 , China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2019年第2期361-373,共13页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金项目(41372086
41672084)
山东省2017重点研发计划(2017CXGC1601)
关键词
碲化物
金矿床
电子探针
铜石地区
成矿机制
telluride
gold deposit
EPM A
Tongshi area
metallogenic mechanism
