沂南贺家沟地区化探异常特征及找矿方向研究

Study on Geochemical Anomaly Characteristics and Ore Prospecting Direction in Hejiagou Area in Yinan County

摘要:

贺家沟地区位于沂南矽卡岩型金矿典型矿床的外围地区，在矿床成因和成矿模式等方面均具有高度相似性。在该地区开展化探扫面工作，根据化探异常结合该地区的成矿地质条件能快速有效的缩小找矿靶区。本文从化探样品分析数据入手，分别从化探异常下限的确定、化探异常特征、化探元素的组合分类以及主要成矿元素在该地区的分布特征等方面进行分析，从而对该地区的成矿条件有了初步认识。在此基础上圈定了以Au，Ag，Cu，Mo等为主要元素的HS1化探异常，该异常规模较大，浓集中心明显，其中主成矿元素Au具有三级浓度分带，Cu，Ag等其他元素异常亦套合较好。通过开展异常查证工作，在该异常区内发现铜金多金属矿（化）点共3处，矿（化）点与化探异常浓集中心的空间吻合程度较高。该地区化探扫面工作取得了较好的成效，具有较好的找矿前景。

Abstract:

Hejiagou area is located in peripheral areas of Yinan skarntype gold deposit. It has a high degree of similarity in terms of the genesis and metallogenic model of the deposit. Geophysical sweeping work is carried out in this area, and the prospecting target areas can be quickly and effectively reduced based on geochemical anomalies and geological conditions of the area. From the aspect of the analysis data of geochemical exploration samples, the determination of the lower limit of geochemical anomalies, the characteristics of geochemical anomalies, the combination classification of geochemical exploration elements, and the distribution characteristics of the major metallogenic elements in the area have been analyzed. Thus, a preliminary understanding of the metallogenic conditions in this area has been gained. On these basis, HS1 geochemical anomaly with Au, Ag, Cu, Mo as the main elements is delineated. The anomaly has a large scale and the concentration center is obvious. Among them, as the main oreforming element, Au has a thirdlevel concentration band, and Cu, Ag and other abnormal elements also fit better. Through carrying out the anomaly verification work, 3 coppergold polymetallic mineralization (chemical) points have been found in this anomalous area, and the spatial correlation between the mineral (chemical) points and the geochemical anomaly concentration centers is high. The geochemical exploration and sweeping work in this area has achieved good results and has good prospecting prospects.