论文部分内容阅读
选取黔西南地区上扬子碳酸盐岩台地—右江盆地的三叠系剖面进行层序划分对比,并重点对台地边缘剖面进行研究,将三叠系划分为8个三级沉积层序。在此基础上,通过与Haq等列出的三叠纪生物地层时代进行对比,建立了黔西南地区三叠系层序充填格架。根据三级沉积层序自下而上的发育组合将三叠系划分出3个二级层序:SS1、SS2、SS3。本区层序充填特征亦反映了印支运动的3个幕次。印支Ⅰ幕,右江盆地为欠补偿型被动大陆边缘阶段,以构造沉降作用为主;印支Ⅱ幕,右江盆地进入过补偿型前陆发展阶段,由于南部板块碰撞的加强,沉积中心向西北迁移;印支Ⅲ幕,随着扬子陆块的全面隆升,西部盆地和东部台地区抬升消亡。
The sequence stratigraphic division and contrast of the Triassic upwelling in the upwelling subcarp- gation and the Youjiang basin in the southwestern area of Guizhou Province are selected for comparison. The marginal section of the platform is mainly studied, and the Triassic is divided into eight tertiary sedimentary sequences. On this basis, the Triassic sequence-filling framework of the southwestern Guizhou Province was established by comparing with the age of Triassic bio-strata listed by Haq et al. Triassic sequences are divided into three second-order sequences according to the bottom-up development combination of the third-order sedimentary sequence: SS1, SS2 and SS3. The sequence of filling in this area also reflects the three episodes of the Indo-Chinese Movement. Indosinian Ⅰ and Youjiang basins are undercompensated passive continental margins with structural subsidence as their main features. During the Indosinian II and Youjiang basins entered the overcompensatory foreland development stage, due to the intensification of the southern plate collision, the sedimentary center Migrating to the northwest; Indosinian III, with the full uplift of the Yangtze block, the western basin and the eastern Taiwan area rose and died.