摘要
在内蒙古西乌旗阿拉坦高勒地区新发现了一个品位低、出露浅、规模大的钒钛磁铁矿矿床。其含矿母岩主体为辉长岩,其次有部分闪长岩、角闪辉长岩和橄榄辉长岩等岩石类型。钻孔岩心岩相学研究表明,基性程度高的橄榄辉长岩通常在含矿岩体的中下部,基性程度低的闪长岩通常在含矿岩体的上部及边部。矿石矿物组合主要为磁铁矿、含钒磁铁矿、钛磁铁矿、黄铁矿、黄铜矿及少量金红石。其中,磁铁矿、含钒磁铁矿和钛磁铁矿通常呈海绵陨铁状、浸染状及分散星点状分布在硅酸盐矿物粒间,表现出典型的岩浆熔离和结晶分异的结构特点,与四川攀枝花铁矿有一定的相似性。与传统的岩浆矿床不同的是,新发现的富矿体通常位于岩体的上部,且普遍发育围岩蚀变。研究认为后期热液叠加对现今矿床的形成与改造起到了一定的作用。
A vanadium-bearing titanomagnetite deposit with low grade,shallow occurrence and large scale has been found in Alatan Gol of Xiwuqi,Inner Mongolia.The main ore-bearing intrusion is composed of gabbro and minor diorite,evjite,olivine gabbro,etc.The core petrography of drills showed that the olivine gabbro with high basic degree always occurred in the middle and low section of ore-bearing rock,whereas the diorite with low basic degree in the upper and margin section of ore-bearing intrusion.The main ore mineral includes magnetite,coulsonite,titanomagnetite,pyrite,chalcopyrite and a little amount of rutile.Among them,magnetite,coulsonite and titanomagnetite were distributed among silicate minerals in spongy aerosiderite,dissemination and scattered star shapes.The structural characteristics are typical magma liquation and crystallization differentiation,which are similar to of the Panzhihua iron deposit in Sichuan.Compared with traditional magmatic deposits,the high-grade ore body of Alatan Gol deposit currently found in the upper intrusion and there widely developed alteration in country rock.The conclusion can be drawn that the superposition of later hydrothermal played an important role to the formation and rebuilding of the present deposit.
出处
《世界地质》
CAS
CSCD
2011年第1期39-45,共7页
World Geology
基金
国家自然科学基金项目(40572058)
关键词
钒钛磁铁矿
岩浆矿床
阿拉坦高勒
西乌珠穆沁旗
内蒙古
vanadium-bearing titanomagnetite
magmatic deposit
Alatan Gol
West Ujimqin Banner
Inner Mongolia
