四川石棉田湾金矿床韧性剪切构造带地球化学障的成矿意义  

MINERALIZATION SIGNIFICANCE OF GEOCHEMICAL BARRIER ON THE DUCTILE SHEAR BELT IN THE TIANWAN GOLD DEPOSIT,SHIMIAN,SICHUAN PROVINCE

作　　者：胡明安[1] 章传玲[1] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074

出　　处：《地质科技情报》2000年第2期33-36,共4页Geological Science and Technology Information

基　　金：原地矿部地质科技定向基金项目! (地科定 95 -11)

摘　　要：康定—石棉—冕宁韧性剪切带在其成生演化过程中 ,产生大量剪切构造及次级断裂 ,造成扩张空间。在这些剪切带扩张空间内 ,由于化学的、物理的及生物化学条件发生突变 ,导致热液的地球化学平衡被破坏 ,促使自然金沉淀析出 ,并聚集在剪切带内构成矿床。剪切带不仅是含金热液迁移的通道 ,而且也是发生成矿作用的有利空间和成矿物质沉淀富集的理想场所 ,是一种具有重要成矿意义的地球化学障。A series of shear structures and secondary faults were produced as to result in extensive space during the formation and development of the Kangding-Shimian-Mianning ductile shear belt in the Shimian,Sichuan Province.In the expansive spaces,the sudden changes of chemical,physical and biochemical conditions lead to final destruction of the auriferous complex compounds and facilitate the precipitation and accumulation of natural gold in the shear belt.The shear structure belts are not only the passageway for migration of auriferous hydrothermal solution,but also the favorable space for mineralization and the site for precipitation and concentration of gold.Therefore the shear belt is an important geochemical barrier for mineralization.

关 键 词：成矿作用 地球化学障 金矿床 韧性剪切构造带 

分 类 号：P618.510.4[天文地球—矿床学] P618.510.5[天文地球—地质学]