内蒙古乌拉特中旗284东金矿区综合信息找矿模型

A Prospecting Model Based on Comprehensive Information for the 284 East Gold Deposit in Wulate Middle Banner of Inner Mongolia

284东矿区位于内蒙古乌拉特中旗北部,区内自发现金矿化以来,一直为民间开采,地质勘查无较大突破。本文通过研究以往地质资料以及野外地质踏勘,发现284东矿区以往勘查中可能存在漏矿现象,进而对已施工钻孔进行样品补取、分析,证实炭质千糜岩层为含金层位,新探获矿体走向长500m,最大斜深500m,金矿床规模达到中型。含炭千糜岩层位严格受布尔罕特敖包逆断裂(F9断裂)控制,总体沿岩体和地层接触带分布,蚀变带分带特征明显;具有高极化率、低电阻率的特征;区内金、银、铜、镍、铅丰度高、分异性强,Au、As组合高背景区呈北东向带状展布,与主控矿断裂一致,推测与含矿热液沿裂隙迁移、富集有关。通过对地质、物探、化探特征的综合分析,建立了284东金矿区综合信息找矿模型,提出地质找矿主线,为后期找矿提供思路。

Located in the north of Wulate Middle Banner,Inner Mongolia,the 284 east mine area has no major breakthrough in geological exploration since the discovery of gold mineralization. In this work,through the study of geological data and field geological reconnaissance,it is found that there may be ore omission in the previous exploration. So the samples of construction drilling holes have been collected and analyzed again,confirming that the carbonaceous phyllite layer is a gold-bearing horizon. The newly found medium-sized gold deposit is 500 m long with slant depth of 500 m. With high polarization and low resistivity characteristics,the carboniferous phyllite strata are controlled strictly by the Burgho Obo reverse fault（ F9 fault）,distributed along the contact zone of rock and strata,showing obvious alteration zoning. Au,Ag,Cu,Ni and Pb in the area are high in abundance and strong in differentiation. The high background area of Au and As combination extends in NE direction,which is consistent with the main ore-control fault,presumably related to the migration and enrichment of ore-bearing hydrothermal fluid along cracks. Based on the comprehensive analysis of geological,geophysical and geochemical characteristics,a prospecting model for the 284 East gold deposit is established,and the main line of geological prospecting is put forward,which provides a train of thoughts for future prospecting.