CAJ | 학술논문

白山钼矿床位于东天山觉罗塔格构造带的东部,赋矿围岩为下石炭统干墩组的黑云母长英质角岩,矿化石英网脉发育.文章测得含矿石英脉中的石英流体包裹体δ~(18)OSMOW值为9.1‰～10.0‰,平均9.425‰,与石英相平衡的水δ~(18)OH2O值为3.357‰～4.257‰,平均为3.682‰;δDSMOW值为-105‰～- 69%,平均-89.25‰.氢氧同位素组成显示白山钼矿床的成矿流体是岩浆水与发生了水-岩作用的大气降水的混合热液,含矿流体以岩浆水为主,演化大气降水的加入是成矿物质沉淀的重要因素.测得辉钼矿的Re-Os等时线年龄为(227.7±4.3)Ma(MSWD=0.32),指示白山钼矿床形成于中三叠世.矿床地质特征和地球化学特征指示白山钼矿床是斑岩型矿床,推测成矿物质主要来自于矿体下部的矿化花岗(斑)岩体.此外,作者还探讨了白山钼矿床的成矿背景,认为矿床形成于挤压的构造环境,是受到同时代古特提斯洋闭合的陆内远程效应影响而产生的成岩成矿作用.
백산목광상위우동천산각라탑격구조대적동부,부광위암위하석탄통간돈조적흑운모장영질각암,광화석영망맥발육.문장측득함광석영맥중적석영류체포과체δ~(18)OSMOW치위9.1‰～10.0‰,평균9.425‰,여석영상평형적수δ~(18)OH2O치위3.357‰～4.257‰,평균위3.682‰;δDSMOW치위-105‰～- 69%,평균-89.25‰.경양동위소조성현시백산목광상적성광류체시암장수여발생료수-암작용적대기강수적혼합열액,함광류체이암장수위주,연화대기강수적가입시성광물질침정적중요인소.측득휘목광적Re-Os등시선년령위(227.7±4.3)Ma(MSWD=0.32),지시백산목광상형성우중삼첩세.광상지질특정화지구화학특정지시백산목광상시반암형광상,추측성광물질주요래자우광체하부적광화화강(반)암체.차외,작자환탐토료백산목광상적성광배경,인위광상형성우제압적구조배경,시수도동시대고특제사양폐합적륙내원정효응영향이산생적성암성광작용.
The Baishan molybdenum deposit is located in the eastern Juduotag tectonic belt of the East Tianshan Mountains. The wall rocks are biotite-felsic hornstone with well-developed mineralized quartz veins, belonging to Lower Carboniferous Gandun Formation (C_1g). The H, O compositions of the hydrothermal fluids in the quartz veins are as follows: δ~(18)O_(SMOW) values are 9.1‰～10.0‰ with an average of 9.425‰,δ~(18)O_(H_2O) balanced with quartz are 3.357‰～4. 257‰ with an average of 3. 682‰, and δD_(SMOW) are - 105‰～-69%, with an average of - 89.25‰. Characteristics of H, O isotopes indicate that the ore-forming hydrothermal fluid was dorninated by magmatic water with the participation of some evolutionary meteoric water that had experienced the water-rock in-teraction. The magmatic water supplied the main metaUogenic materials, and the evolutionary meteoric water served as an important factor for the precipitation of the metallogenic materials. The Re-Os isochronal age of molybdenites is (227.7± 4.3) Ma(MSWD=0.32), suggesting that the mineralization of the ore deposit took place in Middle Triassic. These geological and geochemical charac-eristics imply that the Baishan Mo deposit is a porphyry deposit, and its metallogenic materials mainly came from deep granitic rock. This paper deals with metallogenic background, and the authors hold that the Baishan molybdenum deposit was formed in a compres-sion environment after the post-collisional stage, and its mineralization was controlled by the distant effect of the Paleo-Tethys Ocean in Triassic. This paper has supplied a solid foundation for further researches on mineralization of granitoids which intruded into the same tectonic backgrotmd in Jueluotag block as well as in East Tianshan area.