CAJ | 학술논문

金牙金矿的载金矿物主要为毒砂，次为含砷黄铁矿。毒砂矿物结构均一，为主成矿阶段热液成因，相较于成因复杂的环带状含砷黄铁矿更适合于同位素测年和示踪。通过对该矿床毒砂的单矿物Re-Os同位素测年和S同位素分析，获得Re-Os等时线年龄为（206±22）Ma，反映金矿形成于晚三叠世末期，大致相当于印支期挤压造山向燕山期拉伸的构造转换期。毒砂δ34 S值为-9‰～-3.9‰，平均值为-5.3‰，具有沉积硫的特征，推断硫来自地层，成矿流体为盆地建造水。由此认为金牙金矿是一个与盆地流体和沉积物有关的后生热液矿床。
금아금광적재금광물주요위독사，차위함신황철광。독사광물결구균일，위주성광계단열액성인，상교우성인복잡적배대상함신황철광경괄합우동위소측년화시종。통과대해광상독사적단광물Re-Os동위소측년화S동위소분석，획득Re-Os등시선년령위（206±22）Ma，반영금광형성우만삼첩세말기，대치상당우인지기제압조산향연산기랍신적구조전환기。독사δ34 S치위-9‰～-3.9‰，평균치위-5.3‰，구유침적류적특정，추단류래자지층，성광류체위분지건조수。유차인위금아금광시일개여분지류체화침적물유관적후생열액광상。
Jinya gold deposit,located in Fengshan county,is an important Carlin-type gold deposits in Guan-gxi.Arsenopyrite is one of major gold-bearing minerals in the deposit.The simple texture and hydrothermal ge-netic type that arsenopyrite would be more suitable for isotopic dating and tracing compared with the zoned py-rite.Re-Os isotopic dating and the S isotopic composition of arsenopyrite were undertaken,in order to better constrain the mineralization age and trace metallogenic material and ore-forming fluid.Re-Os isotopic analysis of arsenopyrite yielded isochronal ages of 206 ±22 Ma,indicating the metallogenic epoch of Jinya gold deposit is terminal later Triassic,consistent with the tectonic setting of the structural transition from collisional compression to extension tectonics.The δ34 S value of arsenopyrites ranges from-9‰ to-3.9‰,with the average value of-5.3‰.The sulfur isotopic composition with the sedimentary feature indicates that the sulfur originates from the strata,and ore-forming fluid comes from basin formation water.It can be inferred that Jinya gold deposit is an epigenetic hydrothermal deposit related with basin liquid and sedimentary.