铜陵矿集区蚀变-流体填图与成矿流体系统

为了详细刻画和深刻理解区域流体系统，文章在传统的地质填图方法基础上，针对流体活动性状及其地质记录。提出了一套区域蚀变-流体填图方法程序，并在铜陵地区进行了示范性研究，取得了良好效果。这套“蚀变-流体填图”的方法明确了流体填图的填图对象，填图单位划分理论依据——流体同源性理论。制定了流体系统．流体子系统-流体单元三级填图单元划分方案。在铜陵地区建立了与成矿流体有关的4套流体系统，即海西期喷流沉积流体系统、燕山期岩浆流体系统、燕山晚期中低温流体系统和燕山晚期繁昌火山流体系统，并划分出7个流体子系统和18个流体单元。通过“蚀变-流体填图”掌握了铜陵矿集区成矿流体的空间分布规律，阐述了不同流体系统的成矿特征。

Alteration-Fluid Mapping and Metallogenic Fluid System of Tongling Ore Concentration Area

In order to describe in detail and understand comprehensively regional fluid systems, the authors, in accord with fluid activities and their geological records and on the basis of the traditional geological mapping method, have advanced a set of procedures for large_scale alteration_fluid mapping. A tentative study in Tongling area has achieved good results: the mapping objects are determined, the theoretical basis (isogenetic evolution of fluid activity) for the division of units in alteration_fluid mapping is established, and the scheme of three_grade mapping unit systems, i.e., fluid system_daughter fluid system_fluid unit, is worked out. Four fluid systems related to ore_forming fluids in Tongling ore concentration area is established, namely, Hercynian exhalation_sedimentary fluid system, Yanshanian igneous fluid system, Late Yanshanian low_to_moderate temperature (epithermal) fluid system and Late Yanshanian volcanic fluid system. In addition, seven daughter fluid systems and eighteen fluid units are determined. Through alteration_fluid mapping, the spatial_temporal distribution of ore_forming fluids in the study area can be understood, the temporal series and framework of the fluid system can be established, and the ore_forming features of different fluid systems can be explained.