福建香厝坑铁多金属矿床地质特征及成矿模式

Geological Features and the Metallogenic Mode of the Iron-Polymetallic Deposit in Xiangcuokeng,Fujian Province

通过对香厝坑铁多金属矿床区域地质背景、矿区地质特征和矿床地质特征进行研究,分析了矿床的成矿模式。结果表明:燕山早期中酸性岩浆(汤泉岩体)侵入活动是矿床形成的主导因素,为成矿提供了成矿物质、成矿流体和热能;构造是成矿的重要因素,北北东向区域性大断裂(政和—大浦断裂带)和太华—长塔复式背斜控制了岩浆的侵入,区内滑脱构造控制了矿体的形成和就位;地层是矿床形成的关键控制因素,一方面在含矿流体的运移、矿质的沉淀和矿体的定位过程中,地层成为十分重要的成矿地球化学障;另一方面地层作为矿源层,为矿床的形成提供了大量的成矿物质。矿床成因属接触交代型和风化淋滤型铁多金属矿床。

The metallogenic mode of the iron-polymetallic deposit in Xiangcuokeng,Fujian Province is analyzed based on the regional geological background,geological features,deposit geological characteristics in the area.The results show that the intermediate acid magmatic（Tangquan pluton）intrusive activities of the early Yanshanian period are the dominant factor in the formation of the deposit,which produced a large number of metallogenic materials,ore-forming fluid and energy.The most important factors in the ore formation are the NNW regional major fault（Zhenghe-Dapu fault zone）and Taihua-Changta compound anticlinecontrolling the magmatic intrusion,and the regional decollement structure controlling the formation and perch of ore body.The formation is the key ore control factors.,On the one hand,ore-bearing fluid migration,metallogenic materials precipitationand ore body location work as a very important metallogenic geochemical barrier.On the other hand,this,as the source rock,provides a large amount of ore-forming materials for the formation of the deposit.The genesis of the ore deposit belongs to contact metasomatic type and the weathering-infitration type iron-polymetallic deposit.