贵州省水银洞金矿床茅口组方解石地球化学特征及指示意义  

Geochemical characteristics and indicated significance of Maokou Formation calcite in Shuiyindong gold deposit,Guizhou Province

作　　者：李德东[1] 王玉往[1] 张会琼[1] 解洪晶[1] 陈昱 龙灵利[1] 耿健 王琦睿 LI DeDong;WANG YuWang;ZHANG HuiQiong;XIE HongJing;CHEN Yu;LONG LingLi;GENG Jian;WANG QiRui(Beijing Institute of Geology for Mineral Resources Co.,Ltd.,Beijing 100012,China)

机构地区：[1]北京矿产地质研究院有限责任公司,北京100012

出　　处：《矿床地质》2025年第2期349-364,共16页Mineral Deposits

基　　金：紫金集团矿山综合找矿预测专项-重要矿床类型成矿规律与找矿预测研究项目(编号:KCDZKCY-2022-048)资助。

摘　　要：水银洞矿床位于滇黔桂“金三角”的北部,是该地区层控卡林型金矿重要代表矿床之一。文章对水银洞金矿床茅口组灰岩中方解石进行原位微区LA-ICP-MS分析测试,数据显示稀土含量总体较低(ΣREE=(3.41~18.01)×10-6),标准化模式曲线具有轻稀土元素富集、重稀土元素亏损的右倾模式(LREE/HREE=0.46~10.32,平均值1.93,LaN/YbN=3.31~1666.65,平均值147.37),具有弱Ce负异常(δCe=0.34~1.03,平均值0.60)和弱正Eu异常(δEu=0.62~4.41,平均值1.13)。通过与前人发表的方解石稀土元素对比分析后,认为水银洞热液流体是脉动式侵位,构建了水银洞热液流体脉动侵位模式图。最后,推测茅口组灰岩中的方解石可能代表了下一个热液循环的开始,深部还应有较大的成矿潜力。The Shuiyindong gold deposit is located in the north of the“Golden Triangle”of Yunnan,Guizhou and Guangxi,and is one of the important representative deposit of layered Carlin-type gold deposits in this area.This article presents an in-situ micro-area LA-ICP-MS analysis of calcite within the Maokou Formation limestone of the Shuiyindong gold deposit.The data reveals a generally low concentration of the total rare earth elements(ΣREE=(3.41~18.01)×10-6),with the normalized pattern curve exhibiting a right-leaning trend characterized by an enrichment of light rare earth elements(LREE)and a depletion of heavy rare earth elements(LREE/HREE=0.46 to 10.32,with an average of 1.93;LaN/YbN=3.31 to 1666.65,with an average of 147.37).Additionally,there is a weak negative anomaly of cerium(δCe=0.34 to 1.03,with an average of 0.60)and a mild positive anomaly of europium(δEu=0.62 to 4.41,with an average of 1.13).Through comparative analysis with previously published data on calcite’s rare earth elements,it is inferred that the hydrothermal fluid in the Shuiyindong deposit is characterized by a pulsating intrusion model,which has been illustrated in a schematic representation.Ultimately,it is posited that the calcite within the Maokou Formation limestone may signify the onset of the next hydrothermal cycle,suggesting substantial mineralization potential at greater depths.

关 键 词：方解石 稀土元素 茅口组灰岩 水银洞矿床 贵州省 

分 类 号：P578.61[天文地球—矿物学] P618.51[天文地球—地质学]