新疆富蕴县蒙库铁矿床地质特征及成因分析

蒙库铁矿床位于西伯利亚板块的阿尔泰活动陆缘麦兹晚古生代陆内裂谷盆地，并产于该盆地北东缘的中部，即麦兹倒转紧闭复式向斜的北东倒转翼中部．容矿地层为下泥盆统康布铁堡组的下亚组，铁矿体严格受NIⅣ走向的铁木下尔滚次级紧闭向斜构造控制，并产于向斜构造的核部．控矿断层可能是由铁木下尔滚次级紧闭向斜和巴寨区域性断裂联合作用产生的次级断裂构造．蒙库铁矿床的赋矿围岩主要为前进区域变质作用产生的角闪更长片麻岩，局部可见断裂混合岩化现象．近矿围岩蚀变甚弱，主要表现为夕卡岩化作用，出现了石榴子石、绿帘石、钙铁辉石、透闪石等夕卡岩矿物．其成因类型属喷流沉积-变质改造-岩浆热液叠加富集型多因复成铁矿床．

GEOLOGICAL FEATURES AND GENESIS OF THE MENGKU IRON DEPOSIT IN THE FUYUN,XINJIANG

The Mengku iron deposit is located in the middle of east-northern margin of the Late Palaeozoic Maizi inland rift basin, which is at Aletia active margin of the Siberia plate. It is also located in the middle of east-northern overturned limb of the overturned closed Maizi synclinorium. The ore-bearing strata are the lower Sub-formation of the Kangbutiebao Formation of the Lower Devonian. The iron ore body is strictly controlled by the NW-SE closed Tiemuxiaerguen sub-syncline, and it lies in the core of the closed Tiemuxiaerguen sub-syncline. The ore-controll faults may be the secondary fault arising form the closed Tiemuxiaerguen sub-syncline and the regional Bazhai fracture. The host rock of the Mengku iron deposit is mainly the amphibole-oligoclase-gneiss formed by the progressive regional metamorphism, and locally is the fractural migmatite. The wallrock alteration near the ore body is very thin, and mainly represents as the skarnization, which made the garnet, epidote, hedenbergite, tremolite etc.. The genetic type belongs to the polygenetic and compound iron deposit formed by the exhalation sediment, metamorphic reconstruction and magmatic hydrothermal superposition enrichment.