摘要
中亚成矿域巴尔喀什成矿带阿克斗卡矿田主要由阿克斗卡、艾达里和库兹尔基亚等矿床组成,是发育在火山岛弧环境的典型斑岩型Cu-Mo-Au矿床群,其中阿克斗卡为超大型斑岩铜矿。斑岩型铜成矿作用发生在晚古生代哈萨克马蹄形构造形成过程中,成矿构造背景为乌拉尔-天山断裂系统的大型左行走滑作用和大陆地壳侧向增生过程,具有典型的斑岩铜矿围岩蚀变和矿石矿物分带特征;成矿作用受东西向、北东东向和北西西向断裂控制,主要与早期碱性阶段的硅化蚀变有关,酸性蚀变阶段发生了再矿化与富集成矿作用;据含矿花岗闪长岩中锆石SHRIMP定年本文给出主要成矿时代为327.5±1.9 Ma(早石炭世晚期),成矿模式为"花岗闪长岩"型,属于浅成斑岩铜矿成矿系统。
The Aktogai ore field consists of a group of porphyry Cu-Mo-Au deposits,such as Aktogai,Aidarly,and Kyzylkia deposits,in the Balkhash Metallogenic Belt of the Central Asian Metallogenic Domain.They are formed in the Balkhash volcanic arc of the north-central margin of Kazakhstan Orocline due to the large left-leteral strike-slip movement of the Ural-Tianshan Fault System and lateral crust-growth in the Late Paleozoic.Among them,the Aktogai deposit is a superlarge porphyry Cu-Mo-Au deposit.All of them are porphyry deposits with typical zoning of wallrock alterations and mineral assemblages.The metallogenesis is mainly related to the silicification of the early-stage alkaline alteration and the redeposition in the acid alteration stage.The occurrence of ore-bodies is controlled by the E-W,ENE,and WNW trending faults.The SHRIMP zircon dating of granodiorite has given the Aktogai deposit a metallogenic age of 327.5 ± 1.9 Ma in the late period of the Early Carboniferous.The deposit model of the porphy deposits in the Aktogai ore field is concluded as'granodiorite'type in the hypabyssal porphyry copper system.
出处
《地质力学学报》
CSCD
2010年第4期325-339,共15页
Journal of Geomechanics
基金
国家科技支撑计划重点项目(编号:2007BAB25B02)资助
关键词
阿克斗卡
斑岩型铜矿床
成因模式
开发前景
Aktogai
porphyry copper deposit
geological characteristics
metallogenic model
developing future