阿尔金北缘八八铁矿地质特征与找矿标志  

THE GEOLOGICAL CHARACTERISTICS OF BABA IRON DEPOSIT,NORTHERN MARGIN AREA OF ALTYN MOUNTAIN AND ITS CRITERIA FOR PROSPECTING AND GENESIS

作　　者：祁万修 马玉周 王瑞 魏新昌 姜杰岩 

机构地区：[1]新疆维吾尔自治区地质调查院第一地质调查所,新疆乌鲁木齐830011

出　　处：《新疆地质》2008年第3期253-257,共5页Xinjiang Geology

摘　　要：八八铁矿位于阿尔金北缘喀腊大湾地区,为2006年新发现的中型铁矿床.铁矿化带产于石炭纪侵入体(斜长花岗岩+石英闪长岩)与围岩(大理岩+片岩)接触带附近的辉绿岩内,矿带长约900m,宽20～180m.矿体形态为似层状、脉状、复杂透镜状等,走向NWW,倾向北为主,倾角80°～86°,部分近直立或高角度倾向南.矿体平均品位36.90%～41.96%.铁矿物为磁铁矿类型,磁铁矿晶形多为他形微细粒状.围岩蚀变主要为绿帘石化、阳起石化、纤闪石化、碳酸盐化.矿床成因分析初步认为,八八铁矿属与辉绿岩侵入体热液密切相关,受区域性断裂控制的浅成热液交代充填型铁矿床.进一步找矿标志是发育辉绿岩、大理岩的接触带和阳起石化、纤闪石化、绿帘石化等近矿蚀变.Baba iron deposit, as a medium-sized one found in 2006,is situated at Kaladawan area of the northern margin of Altyn mountain. The iron mineralized belt is 900 meter long and 20- 180 meter wide and occurs inner diabase bodies near the contact between the Carboniferous intrusive（quartz diorite and plagiogranite） and country rocks（marble and schist）. Iron ore-body, shaping as similar bed, vein, lens shaped and so on, extends NWW-trending with dips mainly to northern at angle 80°～86° and partly to southern at high angle or near vertical. The average iron grade of the ore-bodies is 36.90%- 41.96%. Iron mineral is magnetite type, and the crystal form of magnetite is almost fine allotriomorphic-granular. Wall-rock alteration is epidotization, actinolittization, uralitization, carbonatization. The Baba iron ore is considered as hydrothermal metasomatic-filling type deposit with a high metallogenetic temperature. The criteria for further ore prospecting is developing of contact of diabase body and marble and the wall-rock alteration of actinolittization, uralitization and epidotization.

关 键 词：阿尔金北缘 八八铁矿 热液交代 绿岩 

分 类 号：P618.31[天文地球—矿床学]