安徽铜陵矿集区燕山期岩浆流体系统时空结构及成矿  

Temporal-spatial Configuration and Mineralization of Yanshanian Magmatic Fluid Systems in Tongling Ore Concentration Area, Anhui Province

作　　者：曾普胜[1] 杨竹森[1] 蒙义峰[1] 裴荣富[1] 王彦斌[2] 王训诚[3] 徐文艺[1] 田世洪[1] 姚孝德[3] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质科学院地质研究所,北京100037 [3]安徽省地勘局321地质队,安徽铜陵244033

出　　处：《矿床地质》2004年第3期298-309,共12页Mineral Deposits

基　　金：国土资源部专项研究计划 (编号 :2 0 0 10 10 3 );国家自然科学基金重点项目 (批准号 :40 2 3 40 5 1);地质调查项目 (编号 :2 0 0 10 0 0 0 0 0 4)资助

摘　　要：通过野外地质调查和同位素年代学研究 ,结合前人资料 ,建立起铜陵地区燕山期岩浆流体系统的时空格架及岩浆活动与矿产的关系。将铜陵地区的岩浆流体系统分为两类 4个子系统。一类是与燕山期 (15 0～ 133Ma)侵入岩有关的铜陵侵入岩岩浆流体系统 ,受近东西向铜陵_南陵基底断裂控制 ,依据其活动时间先后和流体活动特征 ,可进一步划分为早、晚 2个流体子系统 ;另一类是与燕山晚期 (12 2～ 110Ma)繁昌盆地火山岩有关的火山岩流体系统 ,受北东侧凹陷盆地控制 ,与“宁芜式”玢岩铁矿和金矿关系密切 ,包括 2个子系统。各子系统又包括不同的流体单元 ,流体单元是填图的基本单位。岩浆岩自身可形成独立矿床 ,同时 ,对海西期同生沉积矿床或矿胚层叠加改造 ,增补铜、金等成矿物质 ,使层状矿体变富 ,规模变大 ,在铜陵地区形成全球特有的大型_超大型矽卡岩型铜矿床。Based on field investigation and isotopic chronology, in combination with the data available, the authors have established the spatial_temporal configuration of the magmatic fluid system and the relationship between the magmatic activity and the mineral resources in Tongling area. The Yanshanian magmatic fluid systems are closely related to the Cu_Au mineralization in Tongling area. It is shown by geofluid mapping that the Yanshanian magmatic systems in Tongling area can be divided into 2 classes covering 4 subsystems. The first class is the system related to the Yanshanian (150～133 Ma) intrusions and controlled by the EW_striking fundamental faults, which can be subdivided into three distinctive subsystems on the basis of time sequences and fluid system characteristics: (1) the early stage of the Shizishan skarn subsystem in 153～139 Ma,related to Cu_Au mineralization; and (2) the late stage of the Shatanjiao porphyry subsystem in 139 Ma～133 Ma, related to Cu_Mo mineralization. The second class is the hydrothermal fluid system related to Late Yanshanian (120～110 Ma) Fanchang eruptive rocks in the south of the basin and controlled by the depression of the basin, which can be subdivided into two subsystems: (3) the Kedoushan hydrothermal subsystem in the south of the basin, related to (Fe)_Au mineralization in Fanchang, and (4) the Jiguanshi hydrothermal subsystem related to Au (Ag) in Tongling block, which is superimposed on the Tongling block beyond the basin. Among these 4 subsystems, the first 2 are the most important ones in Tongling area. On the basis of mineral parageneses and spatial distribution of the subsystems, each subsystem can be divided into several fluid units, which are the basic units for mapping of the fluids. Considering time configuration of the magmatic rocks, the high potassic calc_alkaline intrusions are petrogenetically attributed neither to the subduction of Yangtze plate beneath the North China plate during the Indosinian nor to the subduction of the Pacific plate underneath the

关 键 词：地质学 燕山期 岩浆流体系统 时空结构 岩浆成因 铜陵 

分 类 号：P612[天文地球—矿床学]