文献类型：期刊文献

中文题名：贵州西南部峨眉山玄武岩分布区架底和大麦地金矿床金的赋存状态

英文题名：A study on the occurrence state of gold in the Jiadi and Damaidi gold deposits in the Emeishan basalt distribution area, Southwestern Guizhou

作者：李俊海 吴攀 刘建中 张双菊 张丞 宋威方 张兵强 徐良易 赵富远 王大福

第一作者：李俊海

机构：[1]贵州大学资源与环境工程学院,贵州贵阳550025;[2]贵州省地质矿产勘查开发局一0五地质大队,贵州贵阳550018;[3]自然资源部基岩区矿产资源勘查工程技术创新中心,贵州贵阳550081;[4]喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025;[5]贵州省地质矿产勘查开发局,贵州贵阳550004;[6]贵州理工学院,贵州贵阳550003

第一机构：贵州大学资源与环境工程学院,贵州贵阳550025

年份：2021

卷号：41

期号：3

起止页码：234-244

中文期刊名：矿物学报

外文期刊名：Acta Mineralogica Sinica

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金项目(编号:41802088);贵州省科技计划项目(编号:黔科合平台人才[2018]5765);贵州省地质矿产勘查开发局地质科研项目(编号:黔地矿科合[2016]12号)。

语种：中文

中文关键词：金的赋存状态;金矿床;峨眉山玄武岩;贵州西南部

外文关键词：Occurrence state of gold;gold deposit;Emeishan basalt;Southwestern Guizhou

摘要：贵州西南部峨眉山玄武岩分布区位于滇黔桂"金三角"北段,区内成矿地质条件优越、找矿前景较好。贵州省地矿局一0五地质大队根据黔西南地区金矿找矿建立的成矿模式,理论指导找矿,近年来成功新发现了赋存于峨眉山玄武岩中的架底大型金矿床和大麦地中型金矿床,在贵州西南部峨眉山玄武岩分布区乃至全国玄武岩分布区实现了原生金矿的重大找矿突破,架底、大麦地两个金矿床地质特征基本一致。通过详实的岩相学研究,并结合扫描电镜(SEM)、电子探针(EPMA)、激光剥蚀-等离子体质谱(LA-ICP-MS)和金物相分析研究,认为金主要以"不可见金"形式赋存于含砷黄铁矿和毒砂中。架底金矿床赋存于峨眉山玄武岩组中的金矿体(Ⅱ矿体)中的金主要以包裹金形式存在于硫化物中,其平均占有率达73.8%,其次为硅酸盐矿物中的金和游离金,其平均占有率分别为15.4%、8.8%;而赋存于构造蚀变体(SBT)中的金矿体(Ⅰ矿体)中的金主要以游离金形式存在,其平均占有率达90.6%,其次以包裹金形式存在于硫化物、硅酸盐矿物和碳酸盐矿物中,可能与样品受后期风化-氧化作用有关。大麦地金矿床赋存于峨眉山玄武岩组中的金矿体(Ⅱ矿体)中的金与赋存于构造蚀变体(SBT)中的金矿体(Ⅰ矿体)中的金的存在形式基本一致,主要以包裹金形式存在于硅酸盐矿物和硫化物中,其平均占有率分别为41.2%、35.6%,其次为游离金,其平均占有率为16.4%。
The Emeishan basalt distribution area in the Southwestern Guizhou is located in the northern part of the Dian-Qian-Gui "Golden Triangle". There are superior metallogenic geological conditions in the area with good prospecting prospect. The No.105 Geological Party, Guizhou Bureau of Geology and Mineral Exploration & Development guided the prospecting of gold resources in the area by using the metallogenic model established based on the previous prospecting of gold deposits in the southwestern Guizhou. In recent years, it has successfully discovered the large sized Jiadi gold deposit and the medium-sized Damaidi gold deposit, in which gold orebodies are hosted in the Emeishan basalt. It has achieved a major breakthrough of the primary gold prospecting in the Emeishan basalt distribution area in the Southwestern Guizhou and even in basalt distribution areas in China. The geological characteristics of the Jiadi and Damaidi gold deposits are basically the same. Through detailed petrographic study, combined with various analyses by using scanning electron microscope(SEM), electron probe microanalysis(EPMA), laser ablation plasma mass spectrometry(LA-ICP-MS), and gold phase analysis, it is believed that gold mainly occurred in arsenic-bearing pyrite and arsenopyrite in the form of invisible gold. The Orebody II of the Jiadi gold deposit is hosted in the Emeishan basalt Formation. Its gold is mainly existed in sulfides in forms of inclusion gold, with an average share of 73.8%. Its minor gold occurred in silicate minerals as inclusion gold and free gold, with average shares of 15.4% and 8.8%, respectively. However, the gold in the Orebody I, hosted in the structural alteration zone(SBT), occurred mainly in the form of free gold, with an average share of 90.6%, partly occurred as the inclusion gold in sulfides, silicate and carbonate minerals. This could be related to the late weathering and oxidation of the ores. The gold of Orebody II, hosted in the Emeishan basalt Formation, and the gold of Orebody I, hosted in the structural alteration zone(SBT), of the Damaidi gold deposit occurred as basically same forms including the inclusion gold in silicate minerals and sulfides, with average shares of 41.2% and 35.6%, respectively, and the free gold, with an average share of 16.4%.