安徽安庆铜矿接触带三维形态及其控矿机制分析  

Three-Dimensional Geometry of the Contact Zone in the Anqing Copper Deposit,Anhui Province and Its Ore-Controlling Mechanism

作　　者：赵义来[1] 刘亮明[1] 蔡爱良[1] 邹陈[1] 

机构地区：[1]中南大学计算地学研究中心,长沙410083

出　　处：《地质与勘探》2010年第4期649-656,共8页Geology and Exploration

基　　金：国家自然科学基金项目(编号:40772195)资助

摘　　要：安庆铜矿是长江中下游成矿带中规模最大的铜铁矿床,其绝大部分矿体产在月山岩体与三叠系灰岩的接触带上,矿体的产出位置及规模与接触带的特征密切相关。本文通过三维模拟的方法研究了岩体接触带的三维形态及其与安庆铜矿矿体空间定位的关系,认为:月山矿田的矿体分布极不均匀,绝大部分矿体产在形态复杂、产状显著变化的岩体东枝南接触带;安庆铜矿的控矿接触带形态从东到西具有阶梯状-阶梯状、舌状过渡-舌状的变化规律;阶梯状接触带的陡倾及由陡变缓的位置和舌状接触带的尖端处是主要的成矿部位。上述接触带控矿规律推测是区域构造应力场、岩体侵位、冷凝造成的局部应力场以及成矿流体共同作用的结果。The Anqing copper deposit is the biggest copper-iron deposit in the lower-middle Yangtze metallogenic belt. Most orebodies of this deposit lie in the contact zone between Yueshan intrusion and the Triasssic limestone. The position and scale of ore bodies are closely related to the characteristics of the contact zone. Studies on the three-dimensional geometry of the contact zone and its relation to controlling on ore bodies of the deposit are performed based on three-dimensional simulation in this paper. Results show that the ore bodies of the Yueshan field are distributed much unevenly ; of which most are located in the southern contact zones of the eastern intrusion branch which is complicated in shape and highly various in occurrence. In the Anqing deposit, the shapes of ore-controlling contact zone are characterized by step, step-tongue transition, and tongue from the east to the west. The steep position and the position turning from steep to gentle in step-shaped contact zone and the tip of the tongue-like zone are the major sites of mineralization. It is inferred that the interaction of the regional tectonic stress field ,local stress field arose from pluton intruding and cooling and fluid flow resulted in the above mentioned ore-controlling regularities of the contact zone.

关 键 词：接触带 矿体 三维形态模拟 控矿机制 安庆铜矿 

分 类 号：P624.7[天文地球—地质矿产勘探]