湖北省随县王家台金多金属矿石英Rb-Sr同位素定年及成因探讨  

Rb-Sr Isotopic Dating and Genesis of Wangjiatai Gold Polymetallic Ore in Suixian County,Hubei Province

作　　者：朱金 周豹 秦志军 刘文文 汪国虎 张维峰[3] 徐大良[3] Zhu Jin;Zhou Bao;Qin Zhijun;Liu Wenwen;Wang Guohu;Zhang Weifeng;Xu Daliang(Hubei Geological Survey,Wuhan,Hubei 430034;Hubei Geological Exploration Engineering Technology Research Center,Wuhan,Hubei 430034;Wuhan Center,China Geological Survey,Wuhan,Hubei 430205)

机构地区：[1]湖北省地质调查院,湖北武汉430034 [2]湖北省地质勘查工程技术研究中心,湖北武汉430034 [3]中国地质调查局武汉地质调查中心,湖北武汉430205

出　　处：《资源环境与工程》2021年第3期308-312,共5页Resources Environment & Engineering

基　　金：中国地质调查局项目“湖北随州天河口-厉山地区1∶5万矿产地质调查”(DD20160030-08);湖北省地勘基金项目“湖北省随县王家台矿区金多金属矿预查”([2018]20)资助。

摘　　要：王家台金多金属矿区大地构造位置处于华南板块之南秦岭—大别造山带之武当—随州陆内裂谷,前人对其成矿时代的讨论研究较少。通过对矿区主成矿期形成的金多金属矿石进行石英流体包裹体Rb-Sr测年,获得等时线年龄为(142±3)Ma,87Sr/86Sr初始比值为0.71154±0.00015,表明该矿床形成于早白垩世早期,成矿物质来源为壳幔混合源区。结合相关研究认为,该矿床为与燕山期岩浆热液、构造活动相关的石英脉型、蚀变岩型金多金属矿。The geotectonic position of the Wangjiatai gold polymetallic ore is in the Wudang-Suizhou continental rift of the South Qinling-Dabie orogenic belt of the South China plate.There are few discussions about the metallogenic age of this area.The Rb-Sr dating is carried out on the fluid inclusions in quartz from the main mineralization stage,yielding an isochron age of(142±3)Ma,The initial ratio of 87Sr/86Sr is 0.71154±0.00015,suggesting that the Wangjiatai gold polymetallic ore was formed in the Early Cretaceous.The source of ore-forming material was derived from a mixture of crust and mantle components.According to the comprehensive study,it is preliminarily believed that the deposit is quartz vein type and the altered rock type gold polymetallic ore related to the Yanshanian tectonic-magmatism.

关 键 词：金多金属矿 石英 Rb-Sr测年 燕山期 壳幔混合 王家台 

分 类 号：P618.51[天文地球—矿床学] P597[天文地球—地质学]