祁漫塔格找矿远景区地质组成及勘查潜力

祁漫塔格位于东昆仑山东端。近年来,找矿成果显著,相继发现了白干湖大型钨锡矿床,以及具有大型远景的卡尔却卡铜多金属矿床、维宝铅锌矿床和长清铁矿床等,原发现的迪木那里克铁矿也新增资源量,构成大型磁铁矿矿床。这些矿床的发现展示了祁漫塔格巨大的找矿潜力,已成为中国最重要的金属矿产勘查开发接替基地之一。祁漫塔格地质上处于东昆仑、阿尔金构造带和柴达木地块等几个重要构造单元交汇的构造结上,经历了复杂的地质构造演化过程。对它的理解实际是对东、西昆仑及阿尔金构造带构造演化和相互之间关系的认识,也必然涉及柴达木地块与塔里木地台之间的演化关系。就目前资料,祁漫塔格可划分为4个主要成矿期:中元古代沉积变质型磁铁矿和SEDEX型维宝铅锌矿;中奥陶世与镁铁-超镁铁层状侵入岩有关的岩浆钛磁铁矿;志留纪末矽卡岩-石英脉型钨锡矿、铁矿;中晚三叠世斑岩-矽卡岩型铜多金属矿。它们分别代表了区域不同构造演化阶段不同地质单元的产物。现今祁漫塔格的构造格架是多期构造演化拼贴的结果。成矿分布上呈"八字型"构架,以鸭子泉白干湖断裂为界,东、西翼构成了不同的成矿组合。因此,应以两翼为重点,加快勘查的进程。

The Geological Composition and Metallogenetic Prospect in the Qimantage Prospective Region, East Kunlun

In the Qimantage region,located in the eastern end of East Kunlun,there is a marked achievement on mineral resources research in recent years,including the finds of Baiganhu large tungsten-tin deposit,Kaerquka copper multimetallic deposit,Weibao lead-zinc deposit and Changqin iron deposit in succession all with large perspective on a scale.In addition,formerly Dimunalike iron deposit has been become a large sedimento-metamorphic magnetite deposit due to newly added resource volume.These newly-found mineral deposits display a huge potential of the Qimantage region in prospect,and the region has been become a most important replaceable basement of prospecting and exploitation for metal mineral resources in China.Geologically,the Qimantage region is in a structural knot among several tectonic units i.e.East Kunlun,Altun zones and Qaidam massif,and it underwent a complicated process in tectonic evolution.To understanding of structural evolution in the Qimantage region is actually to recognize the relationship of tectonic evolution among East and West Kunlun and Altun zones,and then,certainly including relationship of tectonic evolution between Qaidam massif and Tarim landmass.On the basis of the present data,four mainly metallogenic epochs in the Qimantage region may be divided： 1）Mesoproterozoic sedimento-metamorphic magnetite deposit and Weibao SEDEX type lead-zinc deposit;2）middle Ordovician magmatic titanomagnetite deposits associated with layered mafic-ultramafic intrusions;3）late Silurian skarn-quartz vein tungsten-tin deposits and 4）late-middle Ttriassic porphyry-skarn copper multimetallic deposits.They represent separately products of the different units in the distinct stages of tectonic evolution in the region.At present,structural framework of the Qimantage region is result of multistage collage during tectonic evolution and takes the λ-shape in mineralogical distribution;and two different metallogenic assemblages respectively lie on the eastern and the western wings which are bounded by Yaziquan-Baiganhu fult.Therefore it is emphasized that the mineral exploration on the two wings should be intensified.