中国东南部侏罗纪—第三纪陆相地层沉积特征  

THE SEDIMENTARY FEATURES OF THE JURASSIC-TERTIARY TERRESTRIAL STRATA IN SOUTHEAST CHINA

作　　者：余心起[1] 舒良树[1] 邓平[1] 王彬[1] 祖辅平[1] 

机构地区：[1]南京大学地球科学系,江苏南京210093

出　　处：《地层学杂志》2003年第3期254-263,共10页Journal of Stratigraphy

基　　金：国家自然科学基金项目 (编号:40 172 0 67);重点基金项目 (编号 :40 13 2 0 10 );教育部博士点基金项目(2 0 0 10 2 840 0 5 )资助

摘　　要：系统分析、总结了中国东南部地区中新生代地层的分布状况、沉积作用、构造特征 ,反映出地层分布总体上具 NE走向、SE— NW的分带现象 ,现今盆地的面貌有五种不同类型及相应的几何形态。分析认为 ,中国东南部早、中侏罗世普遍为拉张裂陷沉积环境 ,在赣南、粤北、闽西一带发育双峰式火山岩 ;稍后可能受到区域性挤压 ,如皖南、浙西、赣东北等地有南东向北西逆冲的压性构造 ;早白垩世为火山喷发高峰期 ,研究区均不同程度发生了火山喷发 ,其中东南沿海发育大面积的火山岩 ;早白垩世以后华南全区转为拉张 ,发育大量中、小型断陷盆地等伸展型盆地 ;晚白垩世—第三纪地壳继续处于拉张松弛环境 ,形成以裂谷环境为主要特征的火山—沉积岩石组合。这些结果表明 ,早—中侏罗世受古特提斯构造域和太平洋构造域的共同影响 ,中侏罗世之后太平洋板块占主导 ,上述现象主要系太平洋板块在晚中生代不同阶段对中国东南部俯冲作用的方位、俯冲速率。The NEE strike and the SE NW zoning features of the Late Mesozoic strata of Southeast China is shown by the Jurassic Cenozoic stratagraphic distribution, sedimentation, and tectonic characteristics. Five geometric shapes of the basins are recognized. The analysitic result shows that there was an extension and rift intergrowth sedimentary environment during the Early and Middle Jurassic period that was developed into bimodal volcanic rocks in South Jiangxi, West Fujian and Northeast Guangdong. These features were the results of Tethysan tectonism together with Pacific Plate movement. It probably had been compressed regionally after the Middle Jurassic together with thrusting structure from SE to NW seen in Northwest Zhejiang, North Jiangxi and South Anhui. During the Early Cretaceous, there were volcanisms of varying extents in the whole Southeast China that were concentrated in the coastal regions of Zhejiang and Fujian. The whole area turnd to be extensional after Early Cretaceous period and formed a series of middle and small basins such as fault basins, etc.. And the crust continued to be extensional during the Late Cretaceous and Tertiary period resulting from the volcanic sedimentary association with the rift type characteristics. They were caused by the action of the Pacific Plate with varying subduction angles, rates and directions after Middle Jurassic time.

关 键 词：中国 侏罗纪 第三纪 陆相地层 沉积特征 白垩纪 地层分布 太平洋扳块 中生代 区域地层单位 

分 类 号：P534.5[天文地球—古生物学与地层学] P534.6[天文地球—地质学]