摘要
江西众埠街矿床位于钦杭成矿带东段,是近年来取得重大找矿突破的大型铅锌多金属矿床。为研究众埠街矿床成矿作用,对成矿阶段的石英、方解石开展流体包裹体和氢-氧同位素研究,采用闪锌矿Rb-Sr定年方法测定众埠街大型铅锌多金属矿床的成矿时代,通过闪锌矿Sr同位素初始比(87 Sr/86 Sr)i判断成矿物质来源。测得闪锌矿Rb-Sr等时线年龄为359±7 Ma,表明铅锌成矿期为早石炭世。闪锌矿Sr同位素初始(87 Sr/86 Sr)i值介于0.6937~0.7163之间,平均值为0.709,表明成矿物质来源于壳幔混合。流体包裹体显微测温结果显示,均一温度范围为154~310℃,盐度范围为0.70%~5.70%NaCl eqv。石英氢-氧同位素结果显示,δD V-SMOW值变化范围为-75.4‰~-58.1‰,δ18 O H_(2)O值为1.0‰~8.1‰。综合研究表明,成矿流体主要为岩浆水,混合少量的大气降水。众埠街铅锌矿为岩浆热液型矿床,与沉积型锰矿床没有成因联系。
Zhongbujie is a large Pb-Zn polymetallic deposit that has achieved major prospecting breakthroughs in recent years,located in the eastern section of the Qinhang metallogenic belt.In order to study the mineralization of the Zhongbujie deposit,this paper carried out fluid inclusions and H-O isotope studies of quartz and calcite in the metallogenic stage.The Rb-Sr isochronous dating method of sphalerites was used to determine the metallogenic age of the Zhongbujie deposit and the study of(87 Sr/86 Sr)i of sphalerite is used to determine the source of the ore-forming material.The obtained sphalerite isochron age is 359±7 Ma,indicating that the lead-zinc metallogenic period is the Early Carboniferous.The(87 Sr/86 Sr)i of sphalerite ranges from 0.6937 to 0.7163,with an average value of 0.709,indicating that the ore-forming material of the ore bodies was derived from crust-mantle hybrid.The microscopic temperature results of fluid inclusions show that the homogeneous temperature ranges from 154℃to 310℃,and the salinity ranges from 0.70%to 5.70%NaCl eqv.The results of quartz H-O isotope show that theδD V-SMOW value ranges from-75.4‰to-58.1‰,and theδ18 O H_(2)O value ranges from 1.0‰to 8.1‰.Comprehensive analysis shows that the ore-forming fluid is mainly magmatic water mixed with a small amount of atmospheric precipitation.The Zhongbujie lead-zinc deposit is a magmatic hydrothermal deposit and has no genetic connection with the sedimentary manganese deposits.
作者
蔡报元
黄志斌
张彦伟
余光模
吴星星
王维洋
马天
CAI Baoyuan;HUANG Zhibin;ZHANG Yanwei;YU Guangmo;WU Xingxing;WANG Weiyang;MA Tian(Basic Geological Survey Institute,Geological Survey and Exploration of Jiangxi Province,Nanchang 330030,Jiangxi,China;Jiangxi Institute of Geological Prospecting and Mineral Resource for Nonferrous Metal,Nanchang 330030,Jiangxi,China;Jiangxi Natural Resources Development Center,Nanchang 330025,Jiangxi,China)
出处
《地质通报》
CAS
CSCD
北大核心
2023年第9期1453-1466,共14页
Geological Bulletin of China
基金
江西省地质局项目《江西省乐平众埠街成矿热液运移机制及富集过程》(编号:KF202006)
江西省地质勘查项目《江西省乐平市众埠街锰铅锌矿普查》(编号:20180003)。
