华北地区两个世代深部构造的识别及其意义——燕山运动与深部过程  

Identification of Deep Structure of Two Episodes in North China and Its Significance—Yanshanian Movement and Deep Process

作　　者：邢作云[1] 邢集善 赵斌 刘建华[3] 袁晓萍[1] 

机构地区：[1]中国地质大学,武汉430074 [2]山西地质勘查局物化院,运城044004 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质论评》2006年第4期433-441,i0001,共10页Geological Review

基　　金：中国地质调查局大地调项目(编号200310400009)资助的成果。

摘　　要：通过对华北地区地震层析成像成果的研究,将其深部构造划分为三带:1大型软流圈上涌柱带,主要出现两个大型软流圈上涌柱;2过渡带,呈现4个小型软流圈上涌柱(软块)与岩石圈较厚区(硬块)相间的构造格局;3巨厚岩石圈带,为巨厚岩石圈(鄂尔多斯硬块)稳定区。依据岩石圈热力学衰减原理,一定体积的深部构造可存留200～300Ma之久,而传导入浅表的热量则扩散较快。故以大地热流值为主,结合浅层岩浆活动可将本区中生代与新生代的软流圈上涌柱区分开来:渤海湾柱、大同柱和南阳柱属新生代,邯郸柱、中条柱和吕梁柱则属于中生代燕山期。在此基础上,建立了燕山期深部构造与浅表岩浆构造活动关系的模式:在强大的分散热力作用下,软流圈上涌柱柱头中大量热浮物质向上熔蚀薄的岩石圈及下地壳,混染而主要形成中酸性岩及有关矿产;而在软流圈上涌柱与岩石圈的陡接触处,由于该处热力集中,致使幔源物质底侵下地壳,并再熔融上侵形成偏碱性—碱性杂岩及相应矿产。Analysizing the seismic tomography of North China, its deep structure can be divided into three zones：（1） large-scale asthenosphere upwelling plumes zone, there shows two large-scale asthenosphere upwelling plumes; （2） transitional zone, there shows the tectonic pattern of the alternation of 4 small-scale asthenosphere upwelling plumes （soft mass） with thicker area of lithosphere （hard mass） ; 3） gigantic thick lithosphere zone,it is gigantic thick lithosphere （Ordos hard mass） stable area. According to the attenuation theory of lithosphere thermodynamics, the deep structure of certain volume can exists for 2～3 hundred million years long, the heat energy conducted to shallow surface diffuses quickly. So mainly use geothermal flow, combine shallow magmatism, the Mesozoic and Cenozoic asthenosphere upwelling plume of the study area can be divided into：Bohai Bay plume, Datong plume, and Nanyang plume of Ceozoic, Handan plume, Zhongtiao plume and Luliang plume of Yanshanian of Mesozoic. On the bases of these, the tectonic relation model of deep structure and shallow surface magma in the Yanshanian is established： under the action of the strong dispersed thermal,muchthermal-float material in the head of the asthenosphere upwelling plumes melts and mixs the thin lithosphere and lower crust upward and mainly forms intermediat-acid rocks and related mineral resources. And at the steep contact place of the asthenosphere upwelling plumes and lithosphere, for the thermal there is centered, mantle material underplates into the lower crust and then melts and intrudes upward and form alkaline complex and related mineral resources.

关 键 词：两个世代 深部构造 燕山运动 软流圈上涌柱 柱头 滑脱 

分 类 号：P542.2[天文地球—构造地质学]