大兴安岭北段西呼和楚鲁地区地球化学特征与找矿方向

发布时间：2018-05-21 16:01

本文选题：地球化学特征 + 因子分析　；参考：《矿物学报》2017年04期

【摘要】：西呼和楚鲁地区位于大兴安岭北段,由于森林沼泽覆盖和自然保护等原因,地质调查工作程度低,尚未取得找矿突破。近期开展的地球化学调查成果显示,与陆壳克拉克值相比,区域Ag、Pb、W、As、Sb、Bi元素富集,尤其是在石炭系莫尔根河组和早石炭世闪长岩、晚泥盆世石英闪长岩中含量很高,Cu、Au、Sn相对贫化;大多数成矿元素在区域内分布不均匀,尤其是Au、Ag、Mo、Bi在侏罗系满克头鄂博组、石炭世二长花岗岩和闪长岩体出露区分异极强,Cu在泥盆系大民山组、早白垩世花岗岩中,Au在石炭系莫尔根河组、晚泥盆世石英闪长岩中呈强分异型分布,在局部区域存在富集甚至强烈富集,较为利于成矿。区域主要成矿元素为Au、Pb、Ag、Mo、Cu,伴生成矿元素为W、As、Sb、Sn、Mn、Bi、Zn,主要成矿类型为热液型、火山岩型。根据区域地球化学特征,预测区域成矿潜力较大的地区为锡尼河-那日斯毛德、大架子山、一支沟-小孤山等地。
[Abstract]:Xihuhe Chulu area is located in the northern part of Daxingan Mountains. Due to forest and swamp cover and nature protection, geological survey work is low and no breakthrough has been made in prospecting. The results of recent geochemical surveys show that, compared with the continental crust Clark value, the area is rich in elements such as AgPbPbPbWN / SbGN Bi, especially in the Carboniferous Moergenhe formation and the early Carboniferous diorite, and the late Devonian quartz diorite is relatively depleted. Most of the ore-forming elements are distributed unevenly in the region, especially in the Jurassic Mankitou Obo formation, the Carboniferous monzogranite and diorite rocks, and in the Devonian Daming Shan formation. In the early Cretaceous granites, the au in the Moergenhe formation of Carboniferous and the quartz diorite in the late Devonian are strongly distributed, and there is enrichment or even strong enrichment in the local area, which is favorable for mineralization. The main ore-forming elements in the region are Au-PbAg-Mo-Cu, and the associated ore-forming elements are WPbSbSbSbSnMnMnMn-Bi-Zn. The main metallogenic types are hydrothermal type and volcanic rock type. According to the regional geochemical characteristics, the regions with great metallogenic potential are Sini River, Najismaode, Dagishan, Yanchou and Xiaogushan, etc.
【作者单位】：河南省地质调查院河南省金属矿产成矿地质过程与资源利用重点实验室;河南省地质科学研究所;
【基金】：内蒙古自治区地质勘查基金项目(编号:NMKD2009-25)
【分类号】：P612;P632

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