西秦岭金矿床成矿年代和成矿期次划分  

Classification of metallogenic epochs and metallogenic periods of the gold deposits in Western Qinling Mountains

作　　者：成志雁[1] 刘开君[1] 余平辉[1] 樊小龙[1] 曾亮[1] 马锦龙[1] 

机构地区：[1]兰州大学地质科学与矿产资源学院,甘肃省西部重点实验室

出　　处：《黄金》2015年第10期13-19,共7页Gold

基　　金：国家自然科学基金项目(41173014)

摘　　要：通过对西秦岭金矿床成矿年代学数据的收集和分析,可将本区的金矿床年代数据划分为245～225 Ma、220～190 Ma、170 Ma±、135～110 Ma、75～45 Ma 5组。结合区域内构造演化和岩浆活动将金矿床划分了4个成矿期：印支期末—燕山初期（245～225 Ma）,金矿化的初始富集阶段之一;燕山早期和燕山中期（220～190 Ma,170 Ma±）,西秦岭金成矿的主要形成时期;燕山晚期（135～110 Ma）,再次（叠加）成矿阶段;喜马拉雅期热液活动对金矿床的影响。对区域地质背景和地球化学深入研究的基础上,采用新技术与新方法获得的年代学数据与前人数据对比,从而排除不确定性,精确地划分金矿成矿期次,能为金矿床成因、区域成矿规律总结和远景成矿预测提供重要的理论依据。According to the collection and analysis of the chronology data of gold deposits in Western Qinling Mountains ,the gold deposits in Western Qinling Mountains have been classified into five metallogenic periods ：245 Ma to 225 Ma,220 Ma to 190 Ma,170 Ma ± ,135 Ma to 110 Ma,75 Ma to 45Ma. According to the regional plate-tectonic evolution and magmatism, the gold deposits in Western Qinling ochs ： ①Late Indosinian-Early Yanshanian （245 Ma to 225 Mountains can be classified into four mineralization ep- Ma）, the preliminary enrichment stage of gold mineraliza- tion; ②Early Yanshanian and Middle Yanshanian（220 Ma to 190 Ma, 170 Ma± ）, the major ore-forming stage of gold deposits in Western Qinling Mountains ; ③Late Yanshanian （ 135 Ma to 110 Ma）, one more （telescoping） mineraliza- tion ; ④The influence of hydrothermal activities in Himalaya stage on the gold deposits. Based on thorough study on re- gional geological settings and geochemistry, geochronological data obtained by the application of new technology and methods are compared with the previous ones, eliminating uncertainty, accurately classifying gold mineralization periods and providing theoretical and application significance for genesis of gold deposits, regional mineralization regularitysummary and prospecting.

关 键 词：西秦岭 金矿床 成矿时代 成矿期次 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]