摘要
层控矿床是一种产于一定地层层位中的非岩浆热液矿床。矿源层的存在是层控矿床形成的内因,后期的构造活动、地热增温是层控矿床形成的外因。构造活动、地热增温使矿源层中的地下水更加活跃起来,并萃取其中之矿质而富集成矿。文中还讨论了层控矿床与沉积矿床和其它成因的热液矿床的主要区别。
Geologists held different ideas about the concept of stratabound deposits in the past. By reference to relevant data, the author suggests that stratabound deposits are a type of nonmagmatic hydrothermal deposits occurring within a definite stratigraphic horizon. The existence of source beds is the internal cause of stratabound mineralization. The source bed is a particular horizon having definite features of lithologic and lithofacies associations in which the contents of ore-forming elements are comparatively high. There usually occurs an area of decrease in ore-forming element content in many source beds in which mineral deposits are localized around the deposit within the limits of the ore district. The external cause of stratabound mineralization is the tectonism and increase in the earth's temperature after the source beds were formed. The former generated interlayer fracture zones or interlayer gliding planes in the source beds, promotes the circulation of groundwater and results in favourable ore-accommodating space; the latter is caused by regional tectono-magmatie activity. It can reduce the cohesion coefficient of water and raise the extraction rate of metals; as a result, the metals in source beds are remobilized and concentrated unceasingly.Stratabound mineralization may be explained as follows: tectonic movements and the increase of the earth's temperature caused the circulation of the ground-water which extracted the appreciable early-formed metals from source beds and transported them to the appropriate rocks or interlayer secondary structures in the ore source bed, where they were deposited and concentrated. Deposits formed by stratabund mineralization are referred to as stratabound deposits.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第4期355-358,共4页
Geological Review
