辽宁阜新大巴沟金矿区地质特征及成矿机理探讨

Geological Characteristics and Metallogenic Mechanism Discussion of Dabagou Gold Deposit in FuXin,Liaoning

辽宁大巴沟金矿区位于排山楼金矿外围,为韧性剪切带石英脉型金矿床。目前已发现4条矿体,受断裂构造控制,呈NW向展布,矿体主要产于太古宇建平群大营子组地层与燕山期花岗岩体的接触部位。通过从地层、构造、岩浆岩活动及围岩蚀变等方面探讨金矿成矿机理,表明:太古宇建平群地层为矿源层,多期次构造活动提供了储运空间,燕山期大规模岩浆侵入提供了热液源和推动力,上述条件促使太古宇建平群地层中金活化、迁移、聚集,最后在断裂构造有利部位富集成矿。

Liaoning Dabagou gold deposit is located at the periphery of Paishanlou gold deposit.It is belongs to the shear band quartz vein type gold deposit.At present,four ore-bodies have been found,which are strictly controlled by the fault structure.Most of them are distributed with the directions of NW.The ore-bodies are originated from the contact zone of the Dayingzi formation of Jianping Group of Archaean Eonothem and Yanshanian granite rock mass.The gold metallogenic mechanism of Dabagou mining area are discussed from the aspects of strata,structure,magmatic activity and wall rock alteration.The results show that the gold metallogenic mineral source layer is metamorphic rock formation of Archaean Eonothem,the gold metallogenic storage space is provided by multiphase tectonic activity,the hydrothermalsource and driving force of gold metallogenic are provided by the large cale magmatic emplacement of Yanshanian,so the gold activation and aggregation of strata are promoted,the ore-bearing hydrothermal ismigrated along the tectonic fissures,the gold enrichment mineralization is conducted in the regional tectonic rolling swelled.