华南中新生代盆地形成机制与类型的地球物理研究  

GEOPHYSICAL RESEARCH ON MECHANISM AND TYPE OF ESO-CENOZOIC BASINS IN SOUTH-CHINA

作　　者：范小林 陆国新 殷勇 

机构地区：[1]地矿部石油地质中心实验室

出　　处：《石油物探》1991年第3期92-97,共6页Geophysical Prospecting For Petroleum

摘　　要：华南中新生代盆地的周缘为古生代地层褶皱系,地表地质研究表明它形成于不同的动力学构造环境:其中在褶皱造山环境下形成了前渊盆地;而褶皱后的张性构造环境下形成了半地堑盆地;张扭性拉张裂环境形成箕状断陷盆地。自印支期以来,因受特提斯和滨太平洋两大构造域及华北陆块南挤的叠合影响,使原有的前印支期盆地被改造为新的盆地。当今深部地球物理研究对中新生代盆地形成机制提供了新的认识:褶皱系(含造山带)及前缘形成的盆地大都发育有壳内低速(阻)层;莫霍面附近显示有相对低速(阻)特征;岩石圈具有挠曲(潜没或上拱)现象。上述认识与华南中新生代盆地及古生界褶皱系形成的动力学条件(滑动因素,滑脱机理)一致。但因不同类型盆地所处大地构造环境及基底物性不同而表现出差异,从而使我们有可能依据不断丰富着的地球物理信息建立华南中新生代盆地形成机制模式,并对不同的盆地类型进行划分和探讨。The Meso-Cenozoic basins in S. China ate fringedly marked by Paleozoic fold system. Surface geological investigations indicate that they were formed in different dynamic tectonic settings,such as foredeep basins under erogenic setting, post-folding fault and depression halfgraben basins under tensional tectonic settings. Since Indo-Chinese epoch,The pre-In-dosinian basins have been reformed into new ones due to mutual effect of the Tethys,Marginal Pacific Tectonic Domain and southward push of North-China continental segment. New recognitions to the forming mechanism of Meso-Cenozoic basins have been gained through the deep geophysical studies conducted nowadays. They involves fold system (including erogenic belt) and basins formed prior to them are found mostly related to the low-velocity (resistance) layer developed in crustjthe characteristics of relatively low velocity (resistance)present near moho(mohorovicic discontinuity) ;and lithosphere appears to be bending flexture (subduction or uplift). The recognitions received above reveal that Meso-Cenozoic basins and fold system in S. China bear similar geody-namic regimes (slip factors,detachment mechanism) ,but they have diverse types because they lie on different tectonic settings and the physical behaviors of basement are different. So we can possibly establish the forming mechanism model of Meso-Cenozoic basins and suggest its types as well,on the basis of ever-expanding knowledge to be acquired in terms of geophysical information.

关 键 词：新生代 盆地 岩石圈 

分 类 号：P618.130.2[天文地球—矿床学]