北淮阳构造带老湾金矿区构造与成矿作用的关系  

THE RELATIONSHIP BETWEEN STRUCTURES AND MINERALIZATION OF LAOWAN GOLD MINNIG AREA IN NORTHERN HUAIYANG TECTONIC BELT

作　　者：刘文灿[1] 杜建国[1] 张达[1] 毛晓长[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2003年第1期8-19,共12页Geoscience

基　　金：地质行业科学技术发展基金资助项目(HY979833)。

摘　　要：通过对北淮阳构造带内老湾金矿区构造变形过程中的物质迁移、流体变化及其与成矿关系的初步研究,提出老湾金矿是一受韧性剪切带控制、与岩浆作用有关的构造蚀变岩(-岩浆热液)型金矿床。在龟山—梅山断裂带的韧性推覆、右行走滑、脆性变形3阶段过程中,金元素随差应力和流体变化存在不同的变化。在韧性变形阶段,水/岩比值相对较低的变质热液作用使金元素发生初步富集;在脆性变形阶段,岩浆活动和强烈的水 岩相互作用使金元素富集成矿。因此老湾金矿区构造蚀变岩型金矿床是一经历了早期韧性变形(低水/岩比值)和晚期脆性变形(伴随岩浆活动、高水/岩比值)两阶段金元素富集的成矿过程的产物。Based on the study of removement of main and trace elements, fluid changes in the course of structural deformation, and the relationship between the structures and mineralization, the paper focuses on Laowan gold deposit that is one type of structural alterationrock gold deposits controlled by ductile sheer zone, and related to magmatism. In the process of the ductile napping, rightlateral slip and brittle deformation in GuishanMeishan fault belt,the gold element had a different removement with the changes of difference stress and fluid. At the stage of ductile deformation, metamorphic hydrothermalism with relatively low ratio of water to rock, made gold element primarily concentrate, while at the stage of brittle deformation, magmatic activity and intense waterrock interaction made gold element concentrate and the gold deposit was formed. So the paper puts forward that this type of structural alterationrock gold deposits in Laowan gold mining area is the product of oreforming process of concentration of gold element in two stages, i.e. both ductile deformation(with low ratio of water to rock) and brittle deformation(along with magmatic activity, high ratio of water to rock).

关 键 词：成矿作用 韧性剪切带 金矿床 北淮阳构造带 岩浆作用 水-岩相互作用 

分 类 号：P618.51[天文地球—矿床学]