山西省代县滩上一带隐爆角砾岩地球物理和地球化学特征及其地质意义

隐爆角砾岩型金矿是国内外一种具有重要经济价值的矿床类型。在分析山西代县滩上隐爆角砾岩区的金多金属矿床地质背景、地球物理及地球化学特性的基础上,研究滩上一带隐爆角砾岩的岩石化学特征,发现该区金多金属矿体赋存部位位于岩体内、内外接触带及四集庄组岩组捕虏体中。研究认为,金多金属矿由石英斑岩中硫化物局部富集形成,其主要物质来源与滩上岩体之岩浆期后热液有关,黄铁矿化隐爆角砾岩为容矿岩石,断裂及其次级断裂、裂隙等构造活动为金矿体的形成提供了良好的导矿通道,燕山期中酸性浅成-超浅成岩浆活动为研究区成矿提供了大量含矿热液和成矿物质。

Geophysical and Geochemical Characteristics of Cryptoexplosive Breccias at Tanshang,Daixian,Shanxi Province and Their Geological Significance

Cryptoexplosive breccia type gold deposit is an important and economic deposit. We conducted a detailed geological investigation of the Tanshang Au-polymetallic deposit in Daixian County, Shanxi Province, and analyzed its geophysical and geochemical characteristics. Combining petrographic studies of the cryptoexplosive breccias, it is revealed that the Au-polymetallic ores were formed by the local enrichment of sulfides in the quartz porphyry, which is in the Tanshang intrusive complex, the endo-/exo-contact zones of the intrusion and xenoliths from the Sijizhuang Formation. The ore-forming materials were mainly from the post-magmatic hydrothermal altered Tanshang intrusion, while the ore host is the pyritized cryptoexplosive breccia. The faults and its secondary structures may have provided the fluid conduits and ore depositional sites for the mineralization. The ore-forming material and fluids were mainly from the post magmatic hydrothermal alteration of Yanshanian intermediate-acidic (sub-) hypabyssal rocks in this area.