南秦岭三个典型金矿床的Ar-Ar年代及其地质意义  

^(39)Ar-^(40)Ar Dating of the Three Typical Gold Deposits and Its Geological Significance in the Southern Qinling Region

作　　者：邵世才[1] 汪东波[1] 

机构地区：[1]北京矿产地质研究所,100012

出　　处：《地质学报》2001年第1期106-110,共5页Acta Geologica Sinica

基　　金：国家重点基础研究项目(编号G19990432);国家攻关项目(编号96-914-01-04);有色地勘总局项目(编号98-D-1)的成果。

摘　　要：南秦岭地区的主要金矿床可分为三类,浸染型、石英脉型和韧性剪切带型。通过凤县八卦庙、成县小沟里和康县尚家沟三个典型金矿床详细的地质和氩-氩年代学研究,获得的三个坪年龄分别为131.91±0.89Ma、197.45±1.13Ma和161.59±0.56Ma,三个等时线年龄均与相应的坪年龄相近,且等时线的相关系数均大于0.999,说明成矿作用发生在印支晚期—燕山早期,与秦岭地区在该时期的陆—陆碰撞和陆内造山演化阶段相耦合,碰撞造山—岩浆侵入—矿床定位是一个统一的有机的连续过程;说明造山带关键构造变革时期也是大规模成矿作用期,区域构造演化与大规模成矿是同一大陆动力学过程的不同表现。Three types of gold deposits ( disseminated type, gold-bearing quartz vein type and ductile shear zone type) have been identified in the southern Qinling region, which constitute an integrated metallogenic series. The 39Ar/40Ar dating affirms their mineralizing ages ranging from 131. 91±0. 89Ma to 197. 45±1. 13Ma. It demonstrates that the gold deposits were formed from late Indosinian to early Yanshannian when land-land collision and orogeny happened in the Qinling region. The regional tectono-magmatism and large-scale mineralization of gold represent two aspects of the same continental dynamics; and the collision, emplacement of intru-sives and positioning of gold deposits constitue a united successive process.

关 键 词：金矿床 氩-氩年代学 秦岭造山带 矿床地质 等时线年龄 成矿作用 相关系数 

分 类 号：P618.51[天文地球—矿床学]