玲珑金矿田台上金矿床深部找矿突破及其地质意义

台上金矿床处于玲珑金矿田最南端,受招(远)—平(度)断裂北东段破头青断裂控制。台上金矿床是玲珑金矿田中"焦家式"金矿床的典型产地。通过近年来的深部找矿探索,截至2015年,台上金矿床累计探明金金属量超过340 t。本次对台上金矿床深部和浅部找矿经验加以总结分析对比,揭示了新的成矿规律:金矿体受沿玲珑序列与文登序列花岗岩接触带展布的破头青断裂及其蚀变带控制;往往在蚀变带产状变化处变化巨大;深部靠近主断裂蚀变带附近上下盘,较发育其他断裂蚀变带及脉岩;蚀变带深部比浅部有变宽趋势;矿体走向延长远小于倾向延深。

Breakthrough of prospecting in the deep part of Taishang Gold Deposit in Linglong Gold Field and its geological significance

Located at the southernmost point of Linglong Gold Field,Taishang Gold Deposit is controlled by Po-touqing Fracture,which is the northeastern part of Zhaoyuan-Pingdu Fracture.Being a typical occurrence site for the"Jiaojia type"gold deposits,and through prospecting in its deep part in recent years,the Taishang Gold Deposit has accumulated a proved gold reserve of 340 t by 2015.In this paper,the experience of prospecting in this deposit's deep and shallow parts has been concluded,analyzed and compared,revealing a new ore-forming rule:the gold ore bodies are controlled by Potouqing Fracture and its alteration zones,which distribute along the contact zone of Linglong Se-quence and Wendeng Sequence granite;the gold orebodies often vary largely at the places where the occurrence status of the alteration zones varies; in the deep part, close to the hanging wall or footwall of the main fracture alteration zone,developed other fracture alteration zones and vein rocks,and the deep part of the alteration zones has a more ob-vious trend of becoming wider than the shallow part;the ore bodies extend far shorter along the strike direction than the dip direction.