安徽庐枞火山岩矿集区东南部成矿系列及成矿规律

Minerogenetic series and metallogenic regularities in the southeastern Luzong volcanic rock ore cluster area,Anhui Province

安徽庐枞火山岩矿集区是长江中下游成矿带重要的铁铜硫多金属成矿区。文章基于近年来在该矿集区东南部取得的找矿成果,提出该区有4个成矿系列:与高钾钙碱性系列侵入岩有关的矽卡岩型铁铜、金硫成矿系列,与橄榄安粗岩系有关的火山—次火山热液脉状铜多金属、铁成矿系列,与岩浆作用有关的沉积—叠加改造铁铜成矿系列和与富碱侵入岩有关的铁、铜铅锌、铀成矿系列。分别论述了4个典型矿床地质特征及成矿规律,认为成矿时间为两期三阶段成矿,成矿空间受盆地基底地层石炭系—侏罗系、基底断裂、火山机构及东南部"A型"花岗岩带和高钾钙碱性侵入岩带的控制,提出了区域成矿模式。

The Luzong volcanic rock ore cluster area is an important Fe-Cu-S polymetallic metallogenic belt in the Middle and Lower Reaches of the Yangtze River. Based on prospecting achievements in the southeastern area in recent years, four metallogenic series have been identified for this area： skarn-type Fe-Cu-Au-S mineralization series associated with high-K calc-alkaline series intrusions, volcanic-subvolcanic hydrothermal vein-type copper polymetallic and iron series related to with shoshonite, sedimentary-superimposed iron-copper metallogenesis series associated with magmatism, and Fe-Cu-Pb-Zn uranium mineral-ization series related to alkali-rich intrusive rocks. This paper describes the geological characteristics and metallogenic regularity of four representative deposits of four metallogenic series. Metallogenic time has been classified into ＂Two Period and Three Stages＂ and mineralization distribution is mainly controlled by Carboniferous to Jurassic basement strata of the basin, base faulting, volcanic structure, southeastern Atype granite belt and high-K calc-alkaline series intrusive belt. Based on the above analyses, the metallogenic model in the study area is established.