新疆尼勒克县阿拉斯坦铜矿床地质特征及成因分析

Geology Characteristic and Genesis of Alasitan Cu Deposit in Nikele,Xinjiang

阿拉斯坦铜矿位于塔里木板块伊犁微板块的阿吾拉勒—伊什基里克晚古生代裂谷带,矿床位于裂谷带东端。矿区内主要出露的地层下石炭统大哈拉军山组第三亚组及下侏罗统八道湾组,岩性主要为安山岩,凝灰岩,凝灰质砂岩,凝灰质砾岩,黑色页岩,碳质页岩等。岩浆岩主要为华力西中期的闪长玢岩岩脉,无大范围侵入岩出露。区域内断裂发育,以北西向断裂最为发育,为成矿提供了较好的导矿容矿构造。本文通过介绍区域地质背景,矿区地质特征,初步分析了阿拉斯坦铜矿的成因,认为该矿床属于中—低温火山喷发热液碎裂岩型。

Alasitan copper mine is located in Awulale-Yishijilike Neopaleozoic rift zone of Yilimicroplate,Tarimplate,this deposit lies to the east of rifts.The main exposure stra in diggings is Dahalajunshanformation,Lower Carboniferous and Badaowan formation,Lower Jurassic,andesite,tuff,tuffaceous sandstone,tuffaceousconglomerate,blackshale,carbonaceous shale is the mainly lithology.Themagmatite consisted mostly of variscan diorite-porphyritedike,the scale of intrusive rock is small.this region develops lots of fracture,most faults is NW direction faults,it provide high-class ore-bearing zone and orefluid channel way.In this paper,based on the regional geologic background,the geologic characteristic of mining area,the genesis of the Alasitancopper deposit is analyzed and conclude that it is middle-lower temperature volcano hydrothermal fluid cataclastic type deposit.