山东归来庄地区综合信息找矿模型及靶区预测

Comprehensive Information Prospecting Model and Target Prediction of the Guilaizhuang Area,Shandong Province

物化遥信息的精细化研究是归来庄金矿区找矿新突破的关键。该区化探区域异常范围大,数值高,和燕山期次火山成岩作用相一致,而成矿却和低缓局部异常相一致。重磁异常轴线错动、弯转较多,错动后的产状缓倾侧有利于成矿物质的富集。多期岩浆活动造成遥感多重环状构造交汇及线状与环状构造交汇。由此建立两条找矿主线:隐伏岩体边部、外缘-大中型的构造破碎带-产状变换部位-低缓地球化学区域异常-重磁异常产状倾缓-侧-遥感多重环状构造的交汇部位;地质构造环境的突变处-地球化学障-重磁等值线方向的突变-遥感线性构造的转折处。以归来庄金矿成矿模式为基础,对以上信息进行整合,建立了归来庄地区的找矿模型,并在此基础上优选了银洞沟、十字庄等三个找矿靶区。

Refined research of geophysical,geochemical and remote sensing information is key to the new prospecting breakthrough in the Guilaizhuang gold area. Regional geochemical anomalies in this area are characterized by large scales and high values,consistent with the subvolcanic diagenesis of the Yanshanian period,while the mineralization is corresponding to local relatively low anomalies. Gravity and magnetic anomaly axes have many dislocations and turns. The gentle sides of dislocation are the localities favorable for the enrichment of ore-forming materials. On remote sensing images,multiphase magmatism is recognized by multiple convergences of rings and linear or circular structures. From these features,we establish two prospecting ideas. One is the edge of concealed rock mass-large and medium-sized tectonic fault zone--position of transform occurrence-relatively low geochemical regional anomaly-gentle side of gravity and magnetic anomaly occurrence-multiple intersection part of ring structures. The other is mutations of geological tectonic environment-geochemical barriers-mutations of gravity and magnetic contour directions-turning points of remote sensing linear structures. Based on the metallogenic model of the Guilaizhuang gold deposit and integration of the above information,we constructed a prospecting model for the Guilaizhuang area and determine ed three prospecting targets（ Yindonggou,Shizizhuang,etc.） based on this model.