新疆阿尔泰小土尔根铜矿床地质特征及成因类型

摘要

Xiaotuergen copper deposit is located in the Nuoerte Basin, hosted in inner contact zone between granodio-rite porphyry and tuffaceous sandstone and tuffaceous siltstone of Hongshanzui Formation. Orebodies mainly occurred as vein type and stockwork zone, controlled by joints and fractures. The main mineralization type are disseminated, vein-lets, veinlets-disseminated and stockwork structure. The wall rock alteration includes silication, potassic alteration (K-feldspar, biotite), pyritization, sericitization, kaolinization, chloritization, epidotization, carbonatation. Based on field in-vestigation, drill core observation, as well as comparison with other deposits, we suggest Xiaotuergen is a porphyry cop-per deposit.%小土尔根铜矿位于诺尔特盆地，赋存于花岗闪长斑岩与红山嘴组凝灰质砂岩、凝灰质粉砂岩的内接触带附近，矿体呈脉状，受节理及裂隙控制。矿化主要为浸染状、细脉状、细脉-浸染状、网脉状，围岩蚀变具硅化、钾化（钾长石、黑云母）、黄铁矿化、绢云母化、高岭石化、绿泥石化、绿帘石化、碳酸盐化。通过野外地质调查、岩心观察、镜下鉴定和对比研究，认为小土尔根为斑岩型铜矿。