黔西罐子窑铅锌矿床Pb同位素研究及地质意义

发布时间：2018-04-11 14:54

本文选题：Pb同位素 + 成矿年龄　；参考：《大地构造与成矿学》2017年02期

【摘要】：罐子窑铅锌矿床位于川、滇、黔铅锌成矿区东缘,矿体赋存于上泥盆统-下石炭统的白云质灰岩和白云岩中,呈似层状或陡倾斜脉状产出。在分析该矿床成矿地质条件的基础上,系统研究了矿石和围岩的Pb同位素组成特征,探讨了成矿时代与成矿物质来源。研究结果表明,该矿床矿石Pb同位素组成稳定,属于正常普通铅,利用H-H法计算获得了矿脉铅的主模式年龄150~169 Ma。研究表明该矿石Pb模式年龄应该代表矿床成矿年龄,反映Pb主成矿期在燕山期,燕山期NE向断裂(带)控制着本区铅锌矿体(点)的分布。同位素示踪结果显示本区矿石Pb同位素具有多来源特征,不同时代的碳酸盐岩围岩和基底岩石均为罐子窑铅锌矿床提供了成矿物质。综合研究认为,川、滇、黔铅锌成矿区内铅锌成矿具有多阶段、多旋回性,构造与同位素年代学均揭示,该成矿区存在较大规模的燕山期铅锌成矿作用,在今后的找矿研究工作中应当充分重视。
[Abstract]:The JIANGYao Pb-Zn deposit is located in the eastern margin of the lead-zinc metallogenic deposits in Sichuan, Yunnan and Guizhou. The orebodies occur in dolomitic limestone and dolomite of Upper Devonian and Lower Carboniferous, and appear as stratiform or steeply inclined veins.Based on the analysis of the ore-forming geological conditions of the deposit, the Pb isotopic composition characteristics of ore and surrounding rock are systematically studied, and the metallogenic age and source of ore-forming material are discussed.The results show that the Pb isotopic composition of ore in the deposit is stable and belongs to normal lead. The main model age of lead in vein is calculated by H-H method at 150 ~ 169 Ma.The study shows that the ore Pb model age should represent the ore-forming age of the deposit, which reflects that the main Pb metallogenic age is in the Yanshanian period, and the NE trending faults (belt) in Yanshanian period control the distribution of the Pb-Zn orebodies (points) in this area.The results of isotopic tracer show that the Pb isotopes of ore in this area have multi-source characteristics. The rocks and basement rocks of carbonate rocks in different ages provide the ore-forming materials for the JIANGYao lead-zinc deposit.The comprehensive study shows that the lead-zinc mineralization in Sichuan, Yunnan and Guizhou lead-zinc metallogenic areas has multi-stage, multi-cycle, structural and isotopic chronology, which reveals that there is a large scale of Yanshanian lead-zinc mineralization in this metallogenic area.In the future ore prospecting research work should be paid more attention to.
【作者单位】：中国地质大学(武汉)构造与油气资源教育部重点实验室;湖南省地质调查院;贵州省地矿局113地质大队;贵州省地质调查院;中国地质大学(武汉)地球科学学院;
【基金】：国家自然科学基金(41472190)资助贵州省国土资源厅“贵州区域构造特征、构造演化与矿产空间分布关系研究”、贵州省地矿局“贵州普安罐子窑-水城花嘎地区构造变形及其对铅锌矿控制”和中国地质调查局“上扬子地块东南缘锰矿成矿地质背景研究”(2120114016701)项目联合资助
【分类号】：P597;P618.4

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