综合物化探方法在山西东腰庄绿岩带型金矿外围找矿中的应用

Application of Comprehensive Geophysical and Geochemical Exploration Method in Peripheral Prospecting of Dongyaozhuang Greenstone Belt Type Gold Deposit in Shanxi Province

山西东腰庄金矿是我国典型的绿岩带型金矿床之一,主要赋存于新太古代五台群鸿门岩组浅色变质绿片岩中,含矿带岩性主要为硅化绢云钠长片岩和绢云钠长片岩,层控特征明显。本次建立了东腰庄金矿床地质地球物理地球化学找矿模型,并运用岩石地球化学勘查、电法勘探,在东腰庄金矿外围勘查区圈定化探异常4处、激电异常2处,其中化探1号多元素综合异常与电法异常吻合较好,推测为矿致异常,通过激电测深,推测地质体形态为透镜体,埋深较浅。综合物化探方法利用绿岩带型金矿形成过程中元素迁移带来的原生地球化学异常,以及主要载金矿物黄铁矿与围岩之间的电性差异,在此次找矿勘查过程中圈定了找矿靶区,取得了较好成效,为下步钻探验证工作提供了依据。

Dongyaozhuang gold deposit in Shanxi province is one of the typical greenstone belt type gold deposits in China. It mainly occurs in the light-colored metamorphic greenschist of Hongmen formation in Neoarchean Wutai group. The lithology of the ore-bearing belt is mainly silicified sericite sodium feldspar schist and sericite sodium feldspar schist with obvious strata bound characteristics. The Geological-geophysical-geochemical prospecting model of Dongyaozhuang gold deposit has been established in this paper. Four geochemical anomalies and two IP anomalies have been delineated in the exploration area around Dongyaozhuang gold deposit by means of petro geochemical prospecting and electrical prospecting. Among them, comprehensive anomaly of geochemical prospecting No. 1 coincides well with the electrical anomaly and is presumed to be ore-induced anomaly. Through IP sounding, it is inferred that geological body is a lens body with shallow burial depth. The comprehensive geophysical and geochemical exploration method is to use the primary geochemical anomalies caused by element migration during the formation of greenstone belt type gold deposits and the electrical differences between the main gold-bearing minerals-pyrite and surrounding rocks to delineate the prospecting target area in the process of prospecting and exploration, and achieves good results. It will provide a basis for the next drilling verification work.