【摘要】 笔者从原型盆地分析出发,根据物源区特征与盆地类型的关系以及地层结构特征,对陆东—五彩湾地区晚石炭世盆地的发育背景、展布范围进行了系统论证。研究表明,陆东—五彩湾地区晚石炭世是在碰撞造山后拉伸形成的裂谷盆地群,盆内沉积的碎屑岩来源于早石炭世晚期残留洋闭合产生的岛弧以及多旋回造山带,具有石英含量低,火山碎屑含量高的特征;从盆地边界形态来看,晚石炭世原型盆地与现今残留盆地的格局基本相似,构造碰撞带附近地层剥蚀严重甚至缺失,盆地沉积中心区域的地层保存相对完整。同时,在针对陆东—五彩湾地区1 000余条二维地震测线精细解释的基础上,综合岩心统计、地震相以及反演等信息,认为研究区在晚石炭世发育两种类型断陷,其中,五彩湾、东道海子地区发育单断断陷,三南—滴水泉地区发育双断断陷,两种断陷均有大量的火山岩充填,火山岩的发育及展布主要受到缓坡区一系列断裂的控制。更多还原

【Abstract】 Based on the analysis of prototype basin,according to the relationships between provenance characteristics and the basin types and the structural features of strata,The Late carboniferous basin in the Ludong-Wucaiwan area is systemically demonstrated,which include tectonic setting and distribution range.As a rift basin group,the Carboniferous experienced collision process in Early Carboniferous and intraplate extension in Late Carboniferous.Basin sedimentary clastic rocks come from island arcs and polycyclic orogen,which produced by the collision of the remnant ocean at late stage of Early Carboniferous,and they have the Characteristics of low content of quartz and high content of pyroclastic rock.From the basin boundary shape,the patterns of the prototype basin of Late Carboniferous are similar to the residual basin.The strata near the tectonic collision zones eroded serious or even missed,and the strata in the depocenter are completely preserved.Based on fine interpretation of the 2D seismic lines,the comprehensive core statistics,seismic facies analysis and inversion information,we think there are two modes of rifts in late carboniferous in the study area.In Wucaiwan and Dongdaohaizi regions it mainly develops the single fault rift,and in Sannan-Dishuiquan region it mainly develops the double fault rifts.Two modes of rifts are filled by lots of volcanic rocks,and the development and distribution of the volcanic rocks are mainly controlled by the faults in gentle slope area.更多还原