安徽省池州地区区域成矿模式

Regional metallogenic models for the Chizhou area,Anhui Province

安徽省池州地区矿床类型主要有矽卡岩型、斑岩型、热液型、风化淋滤型、沉积叠改型等。矽卡岩型是本区主要的矿床类型,根据其成矿特点可进一步分为:层控式、复合式、接触式。矿床(体)主要赋存在S-O间剥离面奥陶系汤头组、泥盆系顶部层位、泥盆～石炭系界面、石炭系黄龙-船山组、二叠-三叠系碳酸盐地层。燕山早期中酸性岩浆岩、层间滑脱构造、有利成矿的碳酸盐地层、不同方向不同性质的构造结合部位是本区重要的成矿条件。本文在总结前人成果资料的基础上,建立了本区区域成矿模式,将矿床成矿系列主要划分为三个:①与燕山早期钙碱性幔壳同熔型第一次侵入体有关的以W、Mo为主的成矿系列;②与燕山早期钙碱性幔壳同熔型闪长岩类岩体有关的Cu、Fe、S、Pb、Zn、W、Mo、(Au、Ag)成矿系列;③与燕山晚期陆壳改造型富硅富碱花岗岩有关的Ag、Cu、Fe、Pb、Zn多金属成矿系列。

Major mineral deposits in the Chizhou area of Anhui Province are of skam, hydrothermal, weathering and leaching,depositional superimposition and reworking types. Dominating in the area, the skarn type is further divided into the strata-bound, mixed and contact subs according to its mineralization characteristics. Ore bodies are mostly hosted in the Tangtou Formation of Ordovician about the S-O stripping surface,the upper horizon of Devonian,the Devonian- Carbonaceous boundary,the Huanglong-Chuanshan Formation of Carbonaceous and carbonate strata of Permian and Triassic. Important mineralization conditions in the area include the early Yanshanian intermediate-acid magrnatic rock, interlayer decollement, favorable carbonate stratum,the binding place of structures of different direction and different na- ture. On the basis of a summary of previous work results of other geologists, this paper established regional metallogen- ic models for this area classifying mineral deposits into three major series： （!） W, and Mo-dominant series related to early Yanshanian calc-alkaline mantle-crust syntectic first intrusive; （2） Cu, Fe, S, Pb, Zn, W, Mo, （Au, Ag） series having to do with early Yanshanian mantle-crust syntectic diorite intrusion; （3） Ag, Cu, Fe, Pb, Zn polymetallic series con- cemed with late Yanshanian continental crust reworking type Si- and alkali-rich granite.