甘肃白银折腰山型和石青硐型块状硫化物矿床综合信息找矿模型研究

Comprehensive Information Prospecting Models for Zheyaoshan and Shiqingdong Massive Sulfide Deposits in Baiyin,Gansu Province

甘肃白银厂—石青硐火山岩带是北祁连地区块状硫化物矿床成矿带的主要地段 ,在其中已发现 6个工业矿床。典型矿床的综合信息找矿模型研究对于进一步开展矿体定位预测具有重要意义。文章将已发现的矿床划分为火山喷口Cu(Zn)型 (折腰山型 )、火山喷口斜坡Zn_Pb_Cu型 (小铁山型 )和火山沉积洼地Pb_Zn_Cu型 (石青硐型 )三 (亚 )类 ,并通过对典型矿床的地质特征、地球物理特征、地球化学特征及找矿标志等进行对比分析和研究 ,建立了折腰山型、石青硐型两类矿床的综合信息找矿模型。应用该模型在黑石山地区进行成矿预测 ,取得了良好的效果。

The Baiyinchang_Shiqingdong volcanic belt in Gansu Province is one of the most important areas in the northern Qianlian metallogenic belt. The known massive sulfide deposits in the area, such as Zheyaoshan, Huoyanshan, Xiatieshan, Sigequan, Tongchanggou and Shiqingdong, are all hosted in acidic volcanic rocks of the Cambrian marine volcanic rock assemblage. These deposits, in spite of their general similarities, show differences in such aspects as volcanic structural positions, country rocks, mineralogy, hydrothermal alteration and hydrothermal_sedimentary rock types. They can be divided into three types, namely the paleovolcanic crater Cu (Zn) type ( Zheyaoshan ), the paleovolcanic crater_slope Zn_Pb_Cu type ( Xiaotieshan ) and the paleovolcanic sedimentary depression Pb_Zn_Cu type ( Shiqingdong ). Based on a comparison in geological, geochemical and geophysical characteristics between Zheyaoshan and Shiqingdong, the authors have established two deposit models and their comprehensive information prospecting models, which can be used as prospecting guides in this area. The models were used to delineate new exploration targets in Heishishan with favorable results obtained.