新疆东天山卡拉塔格斑岩型铜(金)矿成矿地质背景与找矿评价  

The Metallogenic Environment of Kalatage Prophyry Copper (Gold) Deposit and Its Prospecting Perspective,Xinjiang,China

作　　者：高珍权[1] 方维萱[1] 胡瑞忠[1] 刘继顺[2] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放研究实验室 [2]中南大学地质研究所,长沙410083

出　　处：《地质学报》2006年第1期90-100,共11页Acta Geologica Sinica

基　　金：国家重大基础研究规划项目(编号2001CB409805)资助成果

摘　　要：卡拉塔格斑岩型铜金矿为哈萨克斯坦Kounrad、Aktogai—中国土屋、卡拉塔格、包古头—蒙古OyuTolgoi亚洲大陆内部最重要的斑岩金铜矿成矿带的重要组成部分之一。该区位处幔隆与幔凹过渡带和重磁变异梯度带,主要铜金矿和异常区分布于两组深大断裂交汇处,具备形成大型—超大型斑岩铜金的大地构造环境。主要类型岩、矿石的化学成分特点、稀土元素组成特征及球粒陨石标准化分布模式、大离子半径元素特征等研究表明,火山、潜火山岩可能来源于上地幔,为岛弧环境下的产物。通过与土屋、Kounrad和OyuTolgoi典型矿床进行对比,它们的成矿地质环境、含矿岩体的主微量元素含量特征、矿床的主要特征等具有较多的相似性。结合区域化探异常和最新找矿成果,认为该区具备形成大型斑岩型铜金矿的条件,具有良好的找矿前景。Kalatage Copper-gold porphyry deposit is one of the important part of Kounrad and Aktogar, Kazakhstan tuwu, Kalatage, Dabate, China- Oyu Tolgoi, Mongolia copper - gold porphyry belt, which is the most important copper porphyry deposit belt in Asia. Geotectonic setting is in transition belt of mantle bulge and concave, and in gravity and magneticfield grade belts. Main copper-gold deposits and anomaly areas locate in two deep faults intersection. All above suggest that Kalatage has met the geotectonic setting of large or supperlarge porphyry deposit. The features of compositions of main and trace elements （include REE）, and chondrite- normalized REE pattern of main type of rocks and ores in Kalatage suggest that volcanic and subvolcanic rocks of this area probably originated from upper mantle, and formed in the setting of island arc backgroung. In comparative studies among Tuwu, Kounrad, Oyu Tolgoi, Cu（Au） deposit and the study area, they have some similarities in metallogenic geological setting, main geological characteristics. All results above suggest that study area has met the geological conditions of Cu-Au porphyry deposits with large - scale, and has a good prospecting potential.

关 键 词：斑岩型铜矿 火山机构 找矿前景 卡拉塔格 东天山 

分 类 号：P618.51[天文地球—矿床学]