现代地质2024，Vol.38Issue(4)：977-990,14.DOI:10.19657/j.geoscience.1000-8527.2024.094
贵州普克金矿区黄铁矿和方解石地球化学特征及地质意义
Geochemical Characteristics and Geological Significance of Pyrite and Calcite in the Puke Gold Prospect Area,Guizhou Province
摘要
Abstract
The Puke gold prospecting area is located 3 km southwest of the famous Nibao gold deposit,sharing the same regional geological background,similar stratigraphic characteristics,tectonic style,and ideal geolo-gical conditions for gold mineralization.Based on field observations of the calcite veins(limonitization)deve-loped on the surface and in drill holes,we conducted mineralogical analysis of calcite and pyrite,rare earth ele-ment(REE)analysis of calcite,electron probe micro-analysis(EPMA),and LA-ICP-MS analysis of pyrite to constrain the origin of the ore-forming fluids and materials in the Puke gold prospecting area.The results show that most of the calcite veins in the Puke gold prospect area have similar characteristics to those in the Nibao gold deposit;however,the latter does not contain ore-bearing calcite veins.Most calcite veins in the Puke gold prospect area exhibit REE patterns similar to those of the Nibao gold deposit,and a few calcite samples show positive Eu anomalies,similar to the calcite from the mineralization period of Carlin-type gold deposits in South-eastern Guizhou.However,the Au content of pyrite in these calcite veins is several orders of magnitude higher than that of the average crustal abundance and sedimentary pyrite,with Au existing in pyrite in the form of Au+.This suggests that these pyrite veins are of hydrothermal origin.The gold-bearing calcite exhibits an en-richment pattern of medium REE and positive Eu anomalies.This suggests that the gold-forming fluids are reducing,possibly controlled by acidic ore-forming fluids as in the case of the Nibao gold deposit.There are fewer calcite veins exposed on the surface in the Puke gold prospect area,possibly because the favorable ore-forming strata of the Puke gold are deeper.There is less ore-forming hydrothermal fluid transported to the pre-sent-day surface strata,implying that ideal gold mineralization developed at deeper levels.关键词
地球化学/热液方解石/黄铁矿/中稀土元素富集/普克金矿区Key words
geochemistry/hydrothermal calcite/pyrite/medium REE enrichment/the Puke gold prospect area分类
天文与地球科学引用本文复制引用
刘旭,戢兴忠,陈强,李源洪..贵州普克金矿区黄铁矿和方解石地球化学特征及地质意义[J].现代地质,2024,38(4):977-990,14.基金项目
全国矿产资源国情调查与潜力动态评价(DD20230040)项目 （DD20230040）
贵州省地质矿产开发局地质科研项目"贵州省兴义市普克金矿基于构造和蚀变研究的深部找矿预测"(黔地矿科合[2016]16号). （黔地矿科合[2016]16号）
