摘要
赛坝沟地区位于柴达木盆地北缘构造带东段,成矿条件优越,沿区域NNW向韧性剪切带及其次级断裂发育一系列的金矿床。在野外地质调查和矿相学研究的基础上,对区内嘎顺、拓新沟和乌达热乎金矿床主成矿阶段黄铁矿开展了微区原位S同位素和微量元素分析。结果表明,赛坝沟地区金矿床S同位素表现出相对集中的塔式分布特征,各矿床均值为-1.55‰~3.93‰,显示地幔硫、花岗岩类硫特征,与柴北缘造山型金矿S同位素组成基本一致;黄铁矿整体富含As、Co、Ni和Se元素,Au、Ag、Cu、Pb、Zn和Bi等元素相对含量较高,Au与As表现出明显的相关性,Au主要以固溶体的形式赋存在黄铁矿晶格间,Cu多以独立的元素替代Fe元素进入到黄铁矿中,矿床形成与岩浆/热液活动相关,成矿流体处于相对还原的环境。通过对赛坝沟地区金矿床控矿构造、蚀变类型、矿物组合、围岩特征以及微量元素地球化学和S同位素综合分析,将该地区金矿床划归为造山型金矿。
The Saibagou region is situated in the eastern segment of the tectonic belt along the northern margin of the Qaidam Basin.Within this area,a series of gold deposits have developed along the NNW-oriented ductile shear belt and its subsidiary faults.This study conducted in situ sulfur isotope and trace element analyses of pyrite from the primary ore-forming stages of the Gashun,Tuoxingou,and Wudarehu gold deposits,building upon comprehensive field geological investigations and mineralogical studies.The findings reveal that the sulfur isotopes of the gold deposits in the Saibagou area exhibit a relatively concentrated tower-type distribution,with an average range of-1.55‰to 3.93‰.This distribution suggests characteristics indicative of both mantlederived and granite-derived sulfur,aligning closely with the sulfur isotope composition typical of orogenic gold deposits located along the northern margin of the Qaidam Basin.The overall composition is enriched with arsenic(As),cobalt(Co),nickel(Ni),and selenium(Se),while the relative concent rations of gold(Au),silver(Ag),copper(Cu),lead(Pb),zinc(Zn),and bismuth(Bi)are notably high.A significant correlation is observed between Au and As.Gold predominantly occurs within the pyrite lattice as a solid solution,whereas copper primarily associates with pyrite as independent elements rather than substituting for iron(Fe).The oreforming fluid is characterized by a relatively reductive environment.Through a comprehensive analysis encompassing ore-controlling structures,alteration types,mineral associations,host rock characteristics,trace element geochemistry,and sulfur isotope data,the gold deposit in the Saibagou area is classified as an orogenic gold deposit.
作者
唐名鹰
丁正江
孙丽莎
战洪雷
王欣
朱伟
华磊
辛真
刘彩杰
孟云
张超
TANG Mingying;DING Zhengjiang;SUN Lisha;ZHAN Honglei;WANG Xin;ZHU Wei;HUA Lei;XIN Zhen;LIU Caijie;MENG Yun;ZHANG Chao(Shandong Engineering Research Center of Application and Development of Big Data for Deep Gold Exploration,Ministry of Natural Resources Technology Innovation Center for Deep Gold Resources Exploration and Mining,No.6 Geological Team of Shandong Provincial Bureau of Geology and Mineral Resources,Weihai 264200,Shandong,China;No.8 Geological Team of Shandong Provincial Bureau of Geology and Mineral Resources,Key Laboratory of Nonferrous Metal Ore Exploration and Resource Evaluation of Shandong Provincial Bureau of Geology and Mineral Resources,Rizhao 276826,Shandong,China)
出处
《黄金科学技术》
北大核心
2026年第1期40-56,共17页
Gold Science and Technology
基金
深部金矿探测大数据应用开发山东省工程研究中心开放课题“柴北缘赛坝沟金矿床成矿热液特征及演化”(编号:SDK202205)
国家重点研发计划“滨海地区金矿勘查评价技术与增储示范”(编号:2023YFC2906900)
山东省重点研发计划(重大科技创新工程)“金属深部协同探测技术装备”(编号:2023CXGC011001)
泰山学者工程(编号:tstp20240847)联合资助。
关键词
微量元素
S同位素
造山型金矿
矿床成因
赛坝沟地区
柴达木盆地北缘
trace elements
sulfur isotope
orogenic gold deposit
deposit genesis
Saibagou area
North margin of Qaidam Basin
