成矿流体的流动-反应-输运耦合与金属成矿

中国著名的铜官山、冬瓜山、新桥等铜、金和硫化物矿床均赋存于上泥盆统五通组砂岩、石英砂岩和中、上石炭统的黄龙组碳酸盐岩不整合面或假整合面邻近。研究表明两个地质事件引发该区形成成因相同或相似的金属矿床。该区具有特定的岩性和地层组合 ;岩浆侵入到该地层组合的同时带进成矿物质和热能 ,热能又驱动成矿流体在岩体周边循环流动。文中对流体从含黄铁矿砂岩流到不整合面时产生的流体流动矿物溶解物质输运沉淀堆积的成矿过程进行了研究和分析 ,提出了一套用于描述热液成矿流动扩散反应过程耦合的偏微分方程组 ,并对此类矿床的成矿过程进行计算机模拟和动力学分析

COUPLED SYSTEM OF FLOW-REACTION-TRANSPORTATION OF ORE-FORMING FLUID AND METALOGENESIS

The copper, gold and sulfide ore deposits of Tongguanshan, Dongguashan and Xinqiao etc. in China occurred at or near the surface of unconformity or disconformity between sandstone, quartz sandstone of Wutong group, Upper Devonian and carbonate rocks of Huanglong group, Middle and Upper Carboniferous. Researches show that there are two geological events responsible for forming the ore deposits with the same or similar genesis in that district: (1) the district possesses specific lithologic characteristics as well as a specific suite of strata; (2)the suite of strata was intruded by the related magma which carried along the associated thermal energy and the ore\|forming materials.The thermal energy drived the ore\|forming fluids and caused them to circulate around the intrusive bodies.When the fluid flowed from the pyrite\|bearing sandstone to the surface of disconformity,the ore\|forming process of fluid flow\|mineral dissolution\|material transportation\|ore precipitation took place.The authors put forward a set of partial differential equations to model the ore\|formig process of copper,gold and sulfides in the district,and carries out the computer simulation and dynamical analysis for the processes.