华北地区镍矿床特征及资源潜力

华北地区镍矿床(点)主要分布在内蒙古、河北省及河南省等地,已发现镍矿床(点)19处,其中大型矿床1处,中型矿床3处,小型矿床8处,矿点7处。新元古代和晚古生代是华北地区镍矿床形成的2个高峰期。矿床类型以岩浆型为主,其次为风化壳型和沉积变质型。沉积变质型镍矿床主要产在华北陆块区内,形成环境与裂陷盆地有关;岩浆型和风化壳型镍矿床主要产在克拉通边缘或造山带,形成环境与大陆边缘裂解或后碰撞伸展环境有关。分析认为,华北陆块北缘出露的镁铁质超镁铁质岩、二连贺根山地区蛇绿混杂岩及内蒙古南端秦祁昆造山带寒武系黑色岩系地层,均具有较好的镍矿资源找矿潜力。

The characteristics and mineral resources potential of Ni deposits in North China

Ni ore deposits and occurrences are mainly distributed in Henan province,Hebei province and Inner Mongolia autonomous region in North China.19 deposits(occurrences)have been discovered including 1 large-sized deposit,3 medium-sized deposits,8 small-sized deposits and 7 occurrences.Neo-proterozoic and Late Paleozoic eras are the two peaks of Ni mineralization.The magmatic Ni deposits are dominant,then weathering crust type and sedimentary-metamorphic type.The sedimentary metamorphic deposit,which is genetically related to rift basin,mainly.However the magmatic and weathering crust deposits are mainly distributed in the margin of the craton or in the orogenic belts,and genetically to the rifting of the continental margin and post-collisional extension respectively.The comprehensive analysis shows that the mafic-ultramafic rocks in northern margin of North China block,ophiolitic melange in the Erlian-Hegenshan area and the Cambrian black rock series strata in Qinqikun orogenic belt at the south end of Inner Mongolia are potential for prospection of nickel deposits.