新疆恰尔墩巴斯希铁-铜-金矿矿床地质研究  

Geology and geochemistry of Qia'erdunbasixi Fe-Cu-Au deposit in Sawur, northern Xinjiang

作　　者：王瑞[1] 朱永峰[1] 

机构地区：[1]北京大学地球与空间科学学院,造山带与地壳演化教育部重点实验室,北京100871

出　　处：《矿床地质》2010年第2期229-242,共14页Mineral Deposits

基　　金：国家自然科学基金创新群体项目(40821002);"十一五"国家科技支撑计划重点项目(2006BAB07B08)的联合资助

摘　　要：新疆恰尔墩巴斯希铁-铜-金矿床中磁铁矿化和铜矿化与中基性侵入岩体密切相关。磁铁矿化在辉长岩体与中基性火山岩的内外接触带发育,由内带的磁铁矿+透辉石组合变化到外带的磁铁矿+石英+钙铁榴石+方解石组合。辉长岩和闪长岩的轻、重稀土元素分异明显〔(La/Yb)N为3.19～7.81〕,富集大离子亲石元素,亏损Nb、Ta,具岛弧岩浆岩特征。辉长岩氧逸度较高,明显富钾。铜矿化主要集中于闪长岩体的外接触带,大部分铜矿化充填在热液角砾岩中。可划分出4个铜矿化阶段:①钠长石-石英阶段;②黄铜矿-黄铁矿-自然金-绢云母-石英阶段;③黄铜矿-黄铁矿-绿帘石-葡萄石阶段;④闪锌矿-方铅矿-石英-方解石阶段。自然金主要出现在糜棱岩化之后的黄铁矿-石英脉中。The Qia＇erdunbasixi Fe-Cu-Au deposit is located in Sawur on the northern margin of west Junggar in northern Xinjiang. Magnetite and copper are developed mostly along the contact zone between gabbro and diorite. Magnetite mineralization occurs along the inner and outer contact zones of gabbro, assuming typical zoning from magnetite ＋ diopside to magnetite ＋ quartz ＋ andradite ＋ calcite. Wall rock with high Fe seems to be one of the sources for magnetite mineralization. The differentiation between light REE and heavy REE of gabbro and diorite is very obvious 〔（La/Yb）N=3.19～7.81〕. Both of gabbro and diorite are enriched with LILE and depleted in Nb and Ta, showing characteristics of island arc magma. Copper mineralization is concentrated along the outer contact zone of diorite. Four stages of copper mineralization could be identified, i.e., ① albite-quartz;② chalcopyrite-pyrite-gold-seriate-quartz; ③ chalcopyrite-pyrite-epidote-prehnite;④ sphalerite-galena-quartz-calcite. Gold mineralization occurs in pyrite-quartz veins closely related to altered granodiorite-porphyry, which, however, have been locally mylonitized.

关 键 词：地质学 铁-铜-金矿床 热液角砾 矽卡岩化 萨吾尔 新疆 

分 类 号：P618.31[天文地球—矿床学] P618.41[天文地球—地质学]