摘要
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 Triassic sections across southwestern Guizhou of upper Yangtze carbonate platform-Youjiang Basin are selected to correlate the consequences,the study also focuses on the sedimentary characteristics of the platform marginal facies.According to the research above,the Triassic is divided into 8 third-order sedimentary sequences.The Triassic sequence filling framework is established by comparing the Haq biostratigraphic data.Three second-order sequences are divided,SS1,SS2,SS3,which are in accordance with genetic stratigraphic combination of third-order sedimentary sequences.The sequence filling characteristics of studied area also reflect three Indo-China movement episodes.Youjiang Basin came to the stage of undercompensated passive continental marginal development during the Indo-ChinaⅠepisode,Youjiang Basin to the stage of overcompensated foreland development during the Indo-ChinaⅡepisode,the sedimentary center switched to the northwest as a result of the strengthening of southern plate collision,with all-round uplifting of the Yangtze block during the Indo-China Ⅲ episode,the western basin and eastern platform demised.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第2期41-47,196-197,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
中国石化集团公司海相前瞻性重大项目(YPH08010)
四川省构造地质学重点学科建设项目(SZD0408)
关键词
层序地层
地层充填格架
三叠系
黔西南
sequence stratigraphy
sequence-filling framework
Triassic
southwestern Guizhou
