长江中下游燕山期火山岩地质特征及其与成矿的关系

笔者根据长江中下游基底构造特征、火山岩时空分布及其相互关系,对该区火山岩盆地进行了重新认定,划分出三个受北东-北北东向和近东西向两组岩石圈断裂控制的断陷火山盆地.在此基础上,依据火山活动特点及其与壳断裂的关系又将其划分为若干个亚盆地.本文系统论述了各盆地的火山岩演化、岩石组合及其地球化学特征;对内生金属矿床与火山岩的关系作了探讨,认为成岩物质主要来源于上地幔,成矿作用是火山活动的一部分,成矿物质主要来源于岩浆.

CHARACTERICS OF YANSHANIAN VOLCANIC ROCK AND IT'S RELATION WITH METALLOGENESIS IN THE MIDDLE-LOW REACHES OF YANGTZE RIVER

According to basement structural characterics,volcanicty time and spatial distribution,and its relatonship,author studied volcanic basins again,and divided it into three downfaulted volcanic basins which were controlled by NE(NNE)and EW trend lithaspheric fault.In this basement,the downfaulted volcanic basins were divided into several volcanic sub-basins by volcanicity features and it's relation with crustalfault.Author concluded volcanic rock evolutional regularity,rock assemblage and geochemical features,discussed the relationship between endogenic mineralization and volcancity,thought the volcanic magma derived from upper mantle,metallization was a part of volcanicity,metallogenic material derived from volcanic magma.