西北地质2026，Vol.59Issue(1)：97-109,13.DOI:10.12401/j.nwg.2025051
南秦岭镇旬盆地微细浸染型金矿床中金的赋存状态研究
Gold Occurrence of the Micro-Disseminated Gold Deposits in Zhen'an-Xunyang Basin,South Qinling Orogenic Belt
摘要
Abstract
The Zhen'an-Xunyang basin,an Early Paleozoic rifted basin situated in the central part of the South Qinling tectonic belt,has seen the discovery of several disseminated gold deposits,like Xiaohe,Huijiagou,and Wangzhuang in recent years.Understanding the occurrence state of gold in these deposits is crucial for uncover-ing the regional gold mineralization enrichment mechanism.This study focuses on two fine-disseminated gold deposits,Wangzhuang and Laojunmiao,by carrying out the systematic microscopic identification and EPMA analysis.These gold deposits exhibit low-grade and metallic sulfide-hosted mineralization.Three types of pyrite closely associated with gold mineralization are identified in the region:arsenic-free pyrite(Py1,Py2),arsenic-bearing pyrite(arsenopyrite)(Py3,Apy),and arsenic-poor pyrite(Py4),with gold enrichment mainly observed after Py2.The Co/Ni ratios of the ore-forming pyrite during the mineralization period typically fall between 1 to 10,indicating a hydrothermal origin linked to the influx of arsenic-bearing hydrothermal fluids.Furthermore,based on the Au-As relationship,it is tentatively suggested that gold elements in the fine-disseminated gold de-posits in the area are primarily present in lattice gold form within pyrite and arsenopyrite.关键词
金的赋存状态/黄铁矿/微细浸染型金矿/南秦岭Key words
gold occurrence/pyrite/micro-disseminated gold deposits/South Qinling分类
天文与地球科学引用本文复制引用
孟五一,魏立勇,高永宝,张振,田映天,李先晨,吴欢欢,郝迪,贾彬..南秦岭镇旬盆地微细浸染型金矿床中金的赋存状态研究[J].西北地质,2026,59(1):97-109,13.基金项目
深地国家科技重大专项(2025ZD1009603-1),自然资源综合调查指挥中心科创基金(KC20240008、KC20240007),陕西省自然科学基础研究计划项目(2023-JC-QN-0363、2024JC-YBQN-0349),中国地质调查局项目(DD20230206504)联合资助. （2025ZD1009603-1）
