豫西九丈沟金矿床方解石激光原位U-Pb年代学特征及地质意义  

Laser in situ U-Pb chronology of calcite in Jiuzhanggou gold deposit and its geological significance

作　　者：秦军强 董文超 曲伟勋 周宇乐 叶帅斌 刘炳瑞 QIN Junqiang;DONG Wenchao;QU Weixun;ZHOU Yule;YE Shuaibin;LIU Bingrui(Songxian Shanjin Mining Co.,Ltd.,Songxian 471400,Henan,China;Henan University of Urban Construction,Pingdingshan 462500,Henan,China;Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区：[1]嵩县山金矿业有限公司,河南嵩县471400 [2]河南城建学院,河南平顶山462500 [3]河南理工大学,河南焦作454000

出　　处：《矿产勘查》2024年第12期2198-2206,共9页Mineral Exploration

基　　金：中国地质调查局项目“河南省熊耳山—外方山金多金属矿整装勘查区关键基础地质研究”(12120114035401);河南省“两权”价款项目“河南省篙县东湾—槐树坪金矿床地球化学特征及成矿预测研究”联合资助。

摘　　要：方解石脉作为热液活动过程中广泛发育且较为重要的直接产物之一,对于限定矿床成矿年龄具有重要的指示意义。目前方解石激光原位U-Pb同位素测年技术起步较晚,仅被应用于流体运动、成岩演化、构造活动历史等方面的研究,在金属矿床年代学研究中的应用实例鲜有报道。前期部分学者对于九丈沟金矿开展了一定的理论研究,但集中于矿床成矿物质来源、构造控矿特征等方面,对于矿床的成矿年龄一直未有报道,制约了对矿床成因的深入认识。基于此,本文通过对九丈沟金矿床热液期方解石脉样品进行激光原位U-Pb同位素年代学研究,研究结果显示样品的同位素年龄集中在44 Ma,是新生代热液活动下的产物,指示九丈沟矿床具有多期次热液活动叠加的特点,该矿床在燕山期热液活动事件之后还受到了新生代构造运动伴随的热液活动事件影响,其强度与燕山期相比较弱,虽有可能在局部富集成矿,但规模有限,不作为矿区主要的找矿方向。Calcite veins,as one of the most important direct products developed extensively during hydrothermal activity,are of great significance in determining the metallogenic age of the deposit.Due to the late start of this method,it has only been used in the study of fluid movement,diagenetic evolution,tectonic activity history,etc.,and its application in the study of the chronology of metal deposits is rarely reported.In addition,the Jiuzhanggou gold deposit has been studied,but the metallogenic age is determined.Based on this,the calcite laser in situ U-Pb isotope chronology of calcite vein samples from the hydrothermal stage of Jiuzhanggou gold deposit is studied in this paper.The results show that the sample is 44 Ma,which is the product of Cenozoic hydrothermal activity,indicating that the deposit was also affected by the Cenozoic tectonic movement following the main mineralization event of Yanshan Stage.Its strength is relatively weak compared with Yanshanian,although it may be locally enriched and ore-forming,the scale is limited,and it is not the main prospecting direction in the area.

关 键 词：方解石 激光原位U-Pb 九丈沟金矿 河南嵩县 

分 类 号：P619.2[天文地球—矿床学]