摘要
西天山伊尔曼得金矿、恰布坎卓它金矿、阿希金矿和塔吾尔别克金矿形成于晚古生代吐拉苏火山盆地构造环境,这些金矿在同一期火山作用下成矿,成矿热液来源、成矿物质来源和陆缘岩浆带的构造背景都存在相似性和共性,但由于流体受成矿区孔隙或断裂构造的影响,如伊尔曼得金矿和恰布坎卓它金矿发育孔隙构造、阿希金矿发育断裂构造、塔吾尔别克金矿发育斑岩原生裂隙和微裂隙,成矿流体在成矿过程中,流体沿着不同构造流动,其运动方式也不同,伊尔曼得金矿和恰布坎卓它金矿的成矿流体沿孔隙以渗透方式运动,产生大量的交代作用,矿体呈穹丘状和似层状,为酸性硫酸盐型金矿;阿希金矿沿断裂构造以两个大平板间的流动方式运动,产生充填作用,矿体呈脉状,为冰长石-绢云母型金矿;塔吾尔别克金矿成矿流体沿着斑岩体的原生裂隙和微裂隙以缓慢流动和渗透方式运动,矿体呈细脉状和细脉浸染状,为斑岩型金矿。导致成矿物理化学环境、成矿机理和矿床类型上存在差异,这些矿床类型构成了金矿成矿系列,建立金矿成矿系列的成矿模式,具有重要的找矿意义。
Yiermande gold deposit, Qiabukanzhuota gold deposit, Axi gold deposit and Tawuerbieke gold deposit occurred in late Paleozoic Tulashu volcanic basin. Those gold deposits fcrmed in the same volcanic activity. They have the same general characters in hydrothermal ore-forming solution source, ore-forming elements source and tectonic setting. But, fluid was affected by pores and faults in the ore district, for example Yiermande gold deposit and Qiabukanzhuota gold deposit have well-developed pore structure, Axi gold deposit has well-developed fault structure, Tawuerbieke gold deposit has well-developed primary fissures and microfissures. When ore-forming fluid in mineralizing process flowed through different structures, its movement ways were different. Wall ro(?)k of Yiermande gold deposit and Qiabukanzhuota gold deposit are composed of first and second lithologic member of Lower Carboniferous Dahalajunshan formation. Their lithology are mainly pyroclastic rock—tuff, ignimbrite, volcanic breccia, and less sedimentary pyroclastic rock—sedimentary tuff. These rocks were altered by hydrothermal ore-forming fluid and produced different strength siliciflcation. Gold mineralization distributed mainly in strong silicified altered rocks and silicified rocks. Wall rock alteration included kaolinization, silicification, baritization, carbonation. While the ore-forming fluid moved through pores in osmosis way, strong metasomatism occurred and formed dome and layer-like orebody. The acidic sulfate type gold deposit was formed. Wall rock of Axi gold deposit are composed of volcanic lava and less pyroclastic rock of Dahalajuenshan formation in lower Carboniferous. They are mainly daeite, andesite and rhyodacite. In additionhere are a small amount of crystal-lithic tuff, volcanic breccia and volcanic agglomerate occuring. Wall rock alteration included silicification, sericitization, chloritization, carbonation, adularization and albitization. Ore-forming fluid moved through faults in flow way between two large flats. Infilling
出处
《新疆地质》
CAS
CSCD
2004年第2期170-177,共8页
Xinjiang Geology
基金
新疆国家305基金项目"新疆阿希金矿外围金矿成矿规律及找矿评价研究"(96915030602)资助
