洋脊地质学与成矿学

洋脊分活动型和稳定型两种,柱状地质剖面由未固结沉积物和上、下洋壳三部分构成,横向断裂带发育。岩石蚀变、变质普遍,可与大陆拉斑玄武岩对比。洋脊正在进行两种成矿过程。近20年在洋脊发现的矿床(化)可分为11个类型,其中有的具有工业意义。洋脊研究的深入,将进一步揭示洋壳的奥秘,还将提高对陆壳以及整个地球历史演化进程中的沉积、岩浆、变质、成矿、成岩和构造等作用以及这些作用之间相互促进和制约关系的认识。

The Geology and Metallogeny of Oceanic Ridges

Oceanic ridges are subdivided into active type and stable (aseismic) type. The vertical sequence of rock units of oceanic ridges consists of unconsolideted oceanic floor sediments, upper oceanic crustal layer and lower oceanic crustal layer. On oceanic ridges transverse fracture zones are general , metamorphism and alteration are common just like those of the continental tholeiite, and there are two metallogenetic processes in which mineral deposits are being formed. The ore deposits (mineralization) discovered on oceanic ridges in recent 20 years are subdivided into 11 patterns, some of them have the value of commodity. The study of oceanic ridges will reveal the secrets of the oceanic crust, and help to recognize the evolution of the continental crust and the earth, especially, sedimentation, magma-tism, metamorphism, diagenesis, metallogenation and tectonics, as well as the relationship of them.