投稿时间：2014-01-13
修订日期：2014-04-19
网络发布日期：2014-06-28
中文摘要:西准噶尔包古图地区是新疆北部重要的金铜产地,已发现中型金矿床1处,金矿点20余处,大型斑岩铜（金、钼）矿床1处。金矿床按矿化类型可分为石英脉-蚀变岩型、蚀变岩型、辉锑矿-石英脉型、富硫化物型以及产于斑岩型铜矿中的伴生金。石英脉-蚀变岩型是最主要的矿石类型,构成包古图地区最主要的经济矿体。蚀变岩型是包古图地区近年来发现的新矿化类型,矿体由就位于NW向断裂中的蚀变凝灰质细砂岩和蚀变凝灰岩组成。辉锑矿-石英脉型矿石中含自然砷、自然锑、Paakkonenite、方锑金矿和硫锑金银矿等罕见矿物,这些矿物都与金矿化直接相关。富硫化物型矿石中,自然铋和辉铋矿与金矿化紧密相关。这些金矿化在空间上与中酸性岩体和岩体附近的岩脉关系紧密,成因上金矿化与岩体密切相关,而与岩脉关系不大。成矿元素在岩体中含量最高,其次为岩体附近的火山碎屑沉积岩,同一区域内岩脉的成矿元素含量最低,离岩体越远,成矿元素含量越低。Au与As、Sb、Bi之间具有不同程度的正相关性,As、Sb、Bi异常是该区找金的重要化探标志。中酸性岩体是最重要的找矿标志,岩体附近的断裂系统是金矿最有利的就位空间。
Abstract:A middle-size gold deposit, over 20 gold ore spots and a large-size porphyry copper (gold and molybdenum) deposit were found in Baogutu area, North Xinjiang. Quartz vein-altered rock type, altered rock type, stibnite-quartz vein type, sulfide-rich type and accessory gold in porphyry deposit could be identified based on the mine- ralization characteristics. The quartz vein-altered rock type is the main ore type, which constitutes the main economic orebodies in Baogutu area. The newly found altered rock types are composed of altered tuffaceous sandstone and altered tuff that were emplaced in the NW-striking faults near the granodiorite stock. Stibnite-quartz vein type is characterized by gold mineralization-related native arsenic, native antimony, Paakkonenite and aurostibite. Native bismuth was found in sulfide-rich type ore, which is closely associated with gold mineralization. These gold deposits are spatially associated with intermediate to acid stocks and dikes, but are genetically only related to stocks. Ore-forming elements are mostly concentrated in intermediate-acid stock, subordinately in pyroclastic sedimentary strata adjacent to the stock, and are lowest in content in intermediate-acid dikes in the same sampling area. There is an obvious negative correlation between the content of ore-forming elements and the distance from the intrusive body. Au is in positive correlation with As, Sb, Bi to different extents; As, Sb, Bi anomalies, especially As anomalies, are important for gold exploration in Baogutu area. The intermediate-acid stocks seem to be the most probable source of ore-forming elements, and the fracture system around the stocks is the best ore-controlling structure.
文章编号：
中图分类号：P618.51
文献标志码：
基金项目:本研究得到国家自然科学基金和国家国际科技合作项目（编号：41203032；41372062；2010DFB23390）的资助
引用文本：
郑波,朱永峰,安芳.2014.新疆包古图地区金矿床矿化类型和与围岩关系研究[J].矿床地质,33(3):558~574ZHENG Bo,ZHU YongFeng,AN Fang.2014.Study of gold mineralization types in relation to host rocks in gold deposits of Baogutu area, Xinjiang[J].Mineral Deposits33(3):558~574
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