文献类型：期刊文献

中文题名：右江盆地烂泥沟和林旺金矿床晚期热液成矿效应研究

英文题名：Late-stage hydrothermal mineralization in the Lannigou and Linwang gold deposits,Youjiang Basin

作者：何雁飞 杨再风 陈军 支太云 赵平 潘启权 谭泽东 杜丽娟 杨瑞东 万大学 刘坤

第一作者：何雁飞

机构：[1]贵州大学资源与环境工程学院,贵州贵阳550025;[2]贵州大学喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025;[3]中国黄金集团贵州有限公司,贵州贵阳550002;[4]贵州省地质矿产勘查开发局一○五地质大队,贵州贵阳550018;[5]贵州理工学院资源与环境工程学院,贵州贵阳550003

第一机构：贵州大学资源与环境工程学院,贵州贵阳550025

年份：2026

卷号：33

期号：2

起止页码：127-147

中文期刊名：地学前缘

外文期刊名：Earth Science Frontiers

收录：;北大核心:【北大核心2023】；

基金：贵州省科技支撑计划(一般项目)项目(黔科合支撑[2023]一般112);国家自然科学基金项目(42262105);贵州省地质勘查资金项目(2024-2号);贵州省科技计划项目(黔科合基础[2016]1404)。

语种：中文

中文关键词：成矿阶段;原位微量元素;硫同位素;卡林型金矿;右江盆地

外文关键词：ore stage;in-situ trace element;sulfur isotope;Carlin-type gold deposits;Youjiang basin

摘要：位于扬子地块西南缘的右江盆地是华南大面积低温成矿域的重要组成部分,盆地内发育大量的金、锑、汞和砷等热液型矿床,其中金具有典型卡林型金成矿特点。对于右江盆地内大多数卡林型金矿床而言,在成矿晚期呈现出强烈的金锑汞矿化,代表了卡林型热液成矿系统的晚期成矿效应,目前对于这些金矿床中金锑汞矿化过程及成矿机制研究尚不清楚,限制了对区域成矿规律的全面认识。林旺与烂泥沟金矿床是盆地相区典型的受断裂控制的卡林型金矿床,且二者具有相同的围岩构造蚀变特征,在成矿晚期普遍存在金锑汞矿化。岩相学研究显示,成矿早期浸染状矿体矿物组合为细粒黄铁矿(Py1)(铁)白云石石英伊利石;成矿晚期主要以脉状矿化为特点,其矿物组合为粗粒黄铁矿(Py2)辉锑矿辰砂石英方解石沥青。对黄铁矿进行激光剥蚀电感耦合等离子体质谱(laser ablation inductively coupled plasma mass spectrometry,LA-ICP-MS)微量元素点分析显示,成矿晚期粗粒黄铁矿的形成过程可能经历了多阶段演化,并通过溶解再沉淀机制继承了早期黄铁矿的特征。不同的是,在晚期沥青脉中,粗粒黄铁矿(Py2b)LA-ICP-MS微量元素点、面分析均显示Au-As呈明显的负相关关系,且黄铁矿核部含金性优于边部,说明晚期含有机烃流体没有直接参与成矿。黄铁矿、辉锑矿和辰砂fs-LA-(MC)-ICP-MS硫同位素研究表明成矿晚期与早期具有相同的S源,来自三叠系赋矿地层。综合分析认为,成矿晚期脉状矿化和早期微细浸染状矿化可能是同一成矿流体多期次演化(挤压伸展转换背景)的产物,并叠加在早期金矿化之上,可能导致金的再次活化富集。
The Youjiang basin,located at the southwest margin of the Yangtze craton,is an important component of the large-scale low-temperature metallogenic domain in South China.It hosts numerous hydrothermal deposits(Au,As,Sb,Hg),which are classified as typical Carlin-type gold deposits.In many of these deposits,late-stage Au-Sb-Hg mineralization is widely developed,representing a significant overprinting event within the Carlin-type hydrothermal system.However,the processes controlling this late-stage mineralization remain poorly understood,hindering a comprehensive understanding of the regional metallogeny.The Linwang and Lannigou gold deposits are typical fault-controlled gold deposits in this region.They share similar characteristics in terms of host rocks,structures,and alteration types,as well as late-stage Au-Sb-Hg mineralization.Petrographic studies reveal that the early-ore stage is characterized by disseminated mineralization consisting of fine-grained pyrite(Py1),Fe-dolomite,quartz,and illite.The late-ore stage is marked by vein-type mineralization comprising coarse-grained pyrite(Py2),stibnite,quartz,calcite,and bitumen.LA-ICP-MS trace element analyses of pyrite(Py1 and Py2)indicate that the late-stage,coarse-grained Py2 is gold-bearing and may have inherited its characteristics from early-stage pyrite through a multi-stage dissolution-reprecipitation process.Element mapping reveals a negative correlation between Au and As in Py2,with gold concentrations higher in the core than in the rim,suggesting that hydrocarbon-bearing fluids did not significantly contribute to gold mineralization during the late stage.fs-LA-MC-ICP-MS sulfur isotope analyses of sulfides(pyrite,stibnite,and cinnabar)demonstrate that both mineralization stages share a common sulfur source,likely derived from Triassic sedimentary rocks.We conclude that the late-stage vein-type mineralization overprinted the early disseminated mineralization,with both stages likely being part of a unified ore-forming system.This process may have caused the remobilization and further enrichment of gold through fluid-rock interaction.