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
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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 NbFe-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 redrawn. 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 Fe3 O4 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 Fe3 O4 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.
The data on the exploration lines and the horizontal flats of the main ore body,Bayan Obo giant NbFe-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 redrawn. 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 Fe3 O4 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 Fe3 O4 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.
引文
[1]郝梓国,王希斌,李震等.白云鄂博碳酸岩型REE-Nb-Fe矿床—一个罕见的中元古代破火山机构成岩成矿实例[J].地质学报,2002,76(4):525-540.
[2]马铭珠,章雨旭,頡颃强,等.华北克拉通北缘白云鄂博群和腮林忽洞群底部碎屑锆石U-Pb定年,Hf同位素分析及其地质意义[J].岩石学报,2014,30:2973-2988.
[3]王中刚,李绍柄,苏贤泽.沉积变质-热液交代型稀土,铁矿床的成因特征[J].地球化学,1973,1:5-12.
[4]沈保丰,张阔.中国叠生型铁矿床成矿特征探讨[J].矿床地质,2016,35(2):213-224.
[5]王凯怡,张继恩,方爱民,等.内蒙白云鄂博矿床成因—矿体内霓长岩化成矿作用与赋矿白云岩的联系[J].岩石学报,2018,34(3):785-798.
[6]王凯怡,杨奎峰,范宏瑞,等.白云鄂博矿床研究若干问题的探讨[J].地质学报,2012,86(5):687-699.
[7]王凯怡,张继恩,方爱民,等.白云鄂博矿床类型的思考和认识[J].矿物学报,2017,37增刊(上),(2):48-9.
[8]王凯怡,张继恩,方爱民等.白云鄂博矿床成因-矿体内霓长岩化成矿作用于赋矿白云岩的联系[J].岩石学报,2018, 34(3):785-98.
[9]王希斌,郝梓国,李震,等.白云鄂博—一个典型的碱性-碳酸岩杂岩的厘定[J].地质学报,2002,76(4):501-525.
[10]杨奎锋.内蒙古白云鄂博地区元古代构造-岩浆演化史与超大型REE-Nb-Fe矿床成因.中国科学院研究生院博士学位论文2008.
[11]袁忠信,白鸽,吴澄宇,等.内蒙白云鄂博铌,稀土,铁矿床的成矿时代和矿床成因[J].矿床地质,1991,10(1):59-70.
[12] Yang XM,Le Bas MJ. Chemical compositions of carbonatite minerals from Bayan Obo,Inner Mongolia,China:implications for petrogenesis[J]. Lithos,2003,72:97-116.
(1)包钢地质队.白云鄂博主东矿储量计算说明书或称78年勘探报告.1978.
[2]马铭珠,章雨旭,頡颃强,等.华北克拉通北缘白云鄂博群和腮林忽洞群底部碎屑锆石U-Pb定年,Hf同位素分析及其地质意义[J].岩石学报,2014,30:2973-2988.
[3]王中刚,李绍柄,苏贤泽.沉积变质-热液交代型稀土,铁矿床的成因特征[J].地球化学,1973,1:5-12.
[4]沈保丰,张阔.中国叠生型铁矿床成矿特征探讨[J].矿床地质,2016,35(2):213-224.
[5]王凯怡,张继恩,方爱民,等.内蒙白云鄂博矿床成因—矿体内霓长岩化成矿作用与赋矿白云岩的联系[J].岩石学报,2018,34(3):785-798.
[6]王凯怡,杨奎峰,范宏瑞,等.白云鄂博矿床研究若干问题的探讨[J].地质学报,2012,86(5):687-699.
[7]王凯怡,张继恩,方爱民,等.白云鄂博矿床类型的思考和认识[J].矿物学报,2017,37增刊(上),(2):48-9.
[8]王凯怡,张继恩,方爱民等.白云鄂博矿床成因-矿体内霓长岩化成矿作用于赋矿白云岩的联系[J].岩石学报,2018, 34(3):785-98.
[9]王希斌,郝梓国,李震,等.白云鄂博—一个典型的碱性-碳酸岩杂岩的厘定[J].地质学报,2002,76(4):501-525.
[10]杨奎锋.内蒙古白云鄂博地区元古代构造-岩浆演化史与超大型REE-Nb-Fe矿床成因.中国科学院研究生院博士学位论文2008.
[11]袁忠信,白鸽,吴澄宇,等.内蒙白云鄂博铌,稀土,铁矿床的成矿时代和矿床成因[J].矿床地质,1991,10(1):59-70.
[12] Yang XM,Le Bas MJ. Chemical compositions of carbonatite minerals from Bayan Obo,Inner Mongolia,China:implications for petrogenesis[J]. Lithos,2003,72:97-116.
(1)包钢地质队.白云鄂博主东矿储量计算说明书或称78年勘探报告.1978.