安徽铜陵层控夕卡岩型铜矿床的成矿作用动力学  

DYNAMICS OF ORE-FORMING PROCESSES OF THE STRATABOUND SKARN COPPER DEPOSITS OF TONGLING, ANHUI PROVINCE

作　　者：於崇文[1] 蒋耀淞[1] 肖正域 

机构地区：[1]中国地质大学

出　　处：《地质学报》1995年第3期243-254,共12页Acta Geologica Sinica

基　　金：地质矿产部"八五"基础地质项目研究基金(编号8502216);国家自然科学基金(编号49173169)

摘　　要：本文应用输运反应耦合过程动力学模型研究了安徽铜陵层控夕卡岩型铜矿床的成矿作用动力学机制。研究指出:(1)成矿流体的盐度梯度和流速均可促进岩浆水与地层水的混合和反应,透水层是二者发生强烈混合输运反应与成矿作用的有利场所;(2)在顺层方向上发生等温输运反应时,成矿流体与岩石接触界面处形成的移动输运反应前锋顺透水层从上游向下游缓慢推进,形成了与地层整合的层伏夕卡岩体与层状矿体;(3)在穿层方向上发生穿越等温线的梯度输运反应结果使矿物成分从镁夕卡岩向硫化物矿体发生渐变过渡。The skarn and orebodies of the stratabound skarn copper deposits of Tongling, Anhui Province are both controlled by definite stratigraphic horizons, and they are concordant with the strata. They occur as layers and layer-like bodies in permeable carbonate rocks of the Middle-Upper Carboniferous Huanglong and Chuanshan formations underlain by impermeable shale or siliceous rocks of the Upper Devonian Wutong Formation. The authors have studied the dynamics of ore-forming processes of the ore deposits with the dynamic model of coupled transport and reaction, and the following results have been obtained. (1) The salinity gradient and flow rate of the ore-forming fluids can both promote the mixing and reaction of juvenile water and formation water, and the permeable strata are favourable sites for intense transport-reaction of mixing and ore-forming processes (2) As isothermal transport-reaction took place along the bedding of strata, the moving transport-reaction front formed at the contact between the ore-forming fluids and the rocks advanced slowly downstream along the permeable strata, and then stratiform skarn and ore bodies concordant with the strata were formed. (3) The gradient transport-reaction taking place across the isotherms in the through-going direction caused the mineralogical composition to alter gradually from magnesian skarn to sulphide orebodies.

关 键 词：层控夕卡岩型 铜矿床 成矿作用 动力学 

分 类 号：P618.410.5[天文地球—矿床学]