白云鄂博超大型Nb-Fe-REE矿床主矿矿体形态变化及深部找矿方向的探讨  

Study on the variation of the main ore body form and deep prospecting direction of the giant Bayan Obo Nb-Fe-REE iron ore deposit

作　　者：郝美珍 赵永岗[1] 张顺 杨进军 王凯怡[2] HAO Mei-zhen1, ZHAO Yong-gang1, ZHANG Shun1, YANG Jin-jun1, WANG Kai-yi2(1. Bayan Obo Iron Mine, Baotou Iron and Steel Company, Baotou Inner mongoha 014080, China;2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China)

机构地区：[1]包钢(集团)公司白云鄂博铁矿,内蒙古包头014080 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质调查与研究》2018年第3期167-175,共9页Geological Survey and Research

基　　金：国家自然科学基金"白云鄂博矿床泥成岩类矿石成因项目(41372081)"

摘　　要：本次研究运用AutoCAD软件,对白云鄂博矿主矿勘探线3~13行的11张剖面图与1978年相对应的剖面图进行了对比,对现有的三个水平分层图与1978年的三个水平分层图进行了对比,认为铁矿体有往深部延伸的趋势,并且深部有新的独立铁矿体存在。主矿白云岩的规模要大于原有资料的估量,矿体在浅部和深部都有扩大和延伸的趋势,在深部白云岩与板岩互层,并包裹和分离铁矿体。深部白云岩母岩浆的早期分异可析出相当数量的磁铁矿,它们与白云石同时或稍晚结晶。这些磁铁矿在合适的地质条件下,聚集起来就可形成一定规模的铁矿,即为碳酸岩岩浆型铁矿。这表明,规模巨大的碳酸岩体在白云鄂博地区即使在深部亦可形成一定规模的铁矿体。该发现提示我们利用深孔资料寻找铁的富集规律是当前寻找铁矿的方向之一。The data on the exploration lines and the horizontal flats of the main ore body, Bayan Obo giant Nb- Fe-REE deposit were transformed to CAD electron edition. Based on previous data plus quite new exploration data the geological profile maps （11） and the geological horizontal flats （6） for the main ore body were re- drawn. By using the computer soft ware, the data of 9 deep boreholes were collected and made a database, the new profile maps and horizontal maps including nine profile maps which may reflect some geological variation in the depth have been drawn.There occur several new iron ore bodies in the deep, which were enclosed and separated by the dolomite carbonatite. It is suggested that the volume of Fe304 could be seperated by early period crystallization at the same time or little later than the dolomite. And because the dolomite carbonatite magma was rich in iron and REE, the Fe304 might be formed iron ore bodies by crystal accumulation. This type of iron ore may be classified carbonatite magmatic iron ore deposit. Thus, if the volume of the carbonatite is large enough in the deep, it may be able to find big iron ore body. Therefore, it is very important to using deep drill to look for the deep iron ore in the Bayan Obo area.

关 键 词：白云鄂博主矿 深部铁矿体 形态变化 碳酸岩 岩浆型铁矿 

分 类 号：P618.3[天文地球—矿床学] P618.7[天文地球—地质学]