新疆库鲁克塔格地区新元古代基性-超基性岩成矿专属性及研究意义

Neoproterozoic Metallogenic Specialization and Significance of the Basic-ultrabasic Complex in Kuluketage,Xinjiang

库鲁克塔格地块为新疆前寒武系出露较全、保存较完好的地块之一。该区为深断裂活动带,岩浆活动极强,主要以基性-超基性深成岩浆活动为主。杂岩体侵位活动与期次沿库尔勒-兴地深断裂由中间向两端依次减少,岩浆性质由早期橄榄拉斑玄武质向碱性玄武质、碳酸岩浆演化。由于源区幔源岩浆熔融程度差异及岩浆形成时不同的温压条件,产生不同性质岩浆。该岩浆具不同成矿专属性,北岩带包括卡乌留克塔格-且干布拉克-团结村偏碱性基性-超基性岩带,系幔源碱性橄榄玄武质岩浆、碳酸岩浆活动产物,具蛭石、磷灰石、磁铁矿等成矿专属性。南岩带为兴地河基性-超基性岩带,系幔源橄榄拉斑玄武质岩浆活动产物,具铜镍硫成矿专属性。

Kuluketage block is one of the best areas for Precambrian geology study in Xinjiang province. The region is near the deep fracture activity belt, the magmatic activity is very intense, which are mainly basic-ultrabasic plutonic mag- matic activity, the emplacement activities and times be less gradually along Korla-Xingdi Fracture and the character of the complex turn gradually from olivine tholeiite to alkaline basaltic magma-carbonic magmatic. Due to the different degree of partial melting in the source mantle and formation temperature pressure, formed the different kinds of magma and the different nature of the magma lead to the different metallogenic series： Northern complex belt, including the Cawuliuke- Qieganbulake-Tuanjiecun basic-ultrabasic rock band,which is the product of the mantle source of alkaline olive basaltic magma-carbonic acid magma activities,along with vermiculite, apatite, diopside, magnetite and metallogenic specificity： Southern complex belt, named Xingdi River basic-ultrabasic belt,which is the product of the mantle source of a olivine tholeiite magma activities, with the copper and nickel metallogenic specificity. This article is based on the achievements of the scientific research published in recent years, the Kuluketage block basic-ultrabasic complex zone of the basic geo- logical characteristics, summarizing the important meaning of the basic-ultrabasic complex in the metallogenic specificity, tectonic setting and ore deposit studies, in order to provide some imformation of the following geological prospecting work.