西北地质2026，Vol.59Issue(1)：44-59,16.DOI:10.12401/j.nwg.2025047
西秦岭早子沟金矿床金赋存状态、成矿物质来源及矿床成因探讨
Discussion on Gold Occurrence State,Metallogenic Material Source and Genesis of the Zaozigou Gold Deposit in West Qinling Orogenic Belt
摘要
Abstract
The Zaozigou gold deposit is located in the Triassic intracontinental rift basin at the western part of the West Qinling orogenic belt,between the Zacalebu-Zaozigou fault and the Sangqu-Diluotang fault.The Za-ozigou gold deposit has been divided into two periods and four stages,the electron probe analysis is focused on the sulfide in the pyrite-arsenopyrite-quartz(II)stage during the hydrothermal mineralization stage in this pa-per.There are mainly four groups of structures in the mine,such as NE,NW,near EW and near SN trending,among which NE and NW trending are the main ones.There were two types of sulfide assemblage in stage II,one is porous hemidiomorphic pyrite(II1),the other is flat idiomorphic pyrite(II2).In situ sulfur and LA-ICP-MS trace element experiments were carried out for the two subclasses in stage II.The results showed that the pyrite is arsenic-containing pyrite with poor iron and sulfur.The δ34SV-CDT of pyrite in II1 stage is-9.92‰～-14.00‰,the δ34SV-CDT of pyrite in II2 stage is-15.58‰～-23.46‰,and the δ34SV-CDT value of pyrite in II2 stage is larger.The ore-forming materials may be mainly sedimentary and magmatic sources at first,with a small amount of metamorphic sources added later.The trace data of pyrite show that the occurrence form of Au shows a gradual transition trend from Au+to Au0,the changes of Co,Ni and As elements in iron and copper elements show a downward trend,and the changes of Cu,Pb,Zn and Ag elements in metallogenic elements show an upward trend.The Co-Ni binary discriminant map indicates that the proportion of hydrothermal deposits increased in the later ore-forming period,and the Co-Ni-As map shows that the two subpyrites are located in the combination area of Carlin type,epithermal type and magmatic hydrothermal type,indicating that the Zaozigou gold deposit has multi-stage genesis.Based on the geological and geochemical characteristics of the deposit,it is considered that the Zaozigou gold deposit belongs to the post-magmatic hydrothermal type.关键词
LA-ICP-MS/电子探针/黄铁矿/早子沟金矿/微量元素Key words
LA-ICP-MS/EPMA/pyrite/Zaozigou gold deposit/trace element分类
天文与地球科学引用本文复制引用
薛仲凯,范堡程,李航,严康,葛战林,栾晓刚,黄豪擎..西秦岭早子沟金矿床金赋存状态、成矿物质来源及矿床成因探讨[J].西北地质,2026,59(1):44-59,16.基金项目
中国地质调查局项目(DD20220975、ZD20220318、DD20230379),陕西省自然科学基础研究计划资助项目(2023-JC-QN-0284)联合资助. （DD20220975、ZD20220318、DD20230379）
