辽宁上堡后台硫铁矿地质特征与成矿模式

Geological Characteristics and Metallogenic Model of Houtai Pyrite Deposit in Shangpu,Liaoning Province

结合辽阳上堡硫铁矿矿区地质工作成果,对矿区地质特征、矿床地质特征进行了分析,在此基础上对成矿要素进行了总结和划分,并详细讨论了矿床成矿模式。结果表明:1区内矿床为形成于燕山期的小型中温热液充填交代型硫铁矿床,成矿围岩为辽河群火山-沉积岩建造和晋宁早期闪长岩;2矿床受地层岩性及构造的双重控制,储矿构造为NEE向弧形断裂构造,矿体赋存于大理岩与闪长岩接触带的构造裂隙内;3矿床的形成主要与燕山期中—酸性岩浆侵入活动,辽河群火山-沉积建造、断裂构造及接触蚀变作用密切相关;4应注意在大量(变质)火山碎屑沉积物堆积的部位寻找该类矿床,该类部位上部应有厚度大、分布广的稳定沉积物层(如板岩等),便于海水中铜离子充分沉积,还应有岩浆-构造的多期活动,使得成矿热液能够充分地进行叠加、改造和运移。上述分析对于该区进一步开展硫铁矿找矿勘探工作有一定的参考价值。

Combing with the geological working results of the mining area of Houtai pyrite deposit,the geological characteristics of the mining area,geological characteristics of the ore-bodies are discussed in detail,besides that,the metallogenic elements is summarized and classified,and the metallogenic model of Houtai pyrite deposit is analyzed.The results show that：1the deposit of the mining area is the minitype mesotherm hydrothermal filling metasomatic type pyrite deposit that is formed in Yanshan epoch,the metallogenic surrounding rock of the deposit is volcanic-sedimentary rock formation of Lioahe group and Jinning early epoch diorite; 2 the deposit is controlled by stratum lithology and structures,the ore-bearing structure is NEE-direction arc-shaped fault structures,the ore-bodies is hosted in the structural fissure of the contact zone of marble and diorite; 3the formation of the deposit is mainly related to the medium-acidic magma intrusion activities of Yanshan epoch,the volcanic-sedimentary formation,fault structures and contact alteration effect of Liaohe group; 4the regions that is piled up with a large number of（metamorphic） volcanic clastic sediments can be regarded as the prospecting area of pyrite deposit,the upper of the regions should be widely distributed with stable sediment layer（such as slate etc.） so as to provide convenience for the full sedimentation of copper ions in seawater,besides that,the multi-stages activities of magma-structure should also be reflected in the regions,which is good to the fully transformation and migration of metallogenic hydrothermal.The above analysis results related to the geological characteristics and metallogenic model of Houtai pyrite deposit in shis paper can provide some reference for the further geological exploration and prospecting work of pyrite deposit in the area.