八卦庙金矿床浅部、深部地质特征对比分析

Comparison and analysis of the geological characteristics in deep and shallow part of Baguamiao Gold Deposit

八卦庙金矿床是位于西秦岭地区的超大型金矿床。根据生产实际情况和探矿工程揭露,八卦庙金矿床浅部与深部矿体的赋矿层位、含矿岩性基本一致,但由浅部到深部矿化蚀变程度逐渐减弱,矿体规模逐渐减小,倾角变缓,分支现象明显,矿体逐渐变窄变薄直至尖灭,整体呈根须状。浅部成矿方式以渗滤交代为主,充填为辅,矿体以蚀变岩型为主,石英脉型次之,矿体与围岩界线不明显;深部成矿方式以充填为主,矿体以石英脉型为主,矿体与围岩界线较明显。该研究成果对老矿山深部找矿工作具有指导意义。

Baguamiao Gold Deposit is a super large-scale gold deposit located in West Qinling area. Revealed by production practice and exploration project,the ore-hosting strata and lithology in the deep and shallow part of Baguamiao Gold Deposit are generally the same. However,the alteration degree diminishes with the depth which is the case of the ore body scale; the dip angle become more gentle; branching phenomena are obvious; the ore body becomes narrow and thin and finally pinches out; and the whole ore body takes the form of root hair. The mineralization in the shallow part is mainly infiltration metasomatism,the ore body is mainly quartz vein and the border of ore body and surrounding rocks is evident. The research achievements have guiding significance for deep prospecting in old mines.