Sequence Stratigraphy of the Sinian—Middle Devonian System in the Tarim Basin
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摘要: 塔里木盆地震旦系—中泥盆统层序地层可划分为2个巨层序、6个超层序、17个层序。震旦纪—中泥盆世区域大地构造演化经历了古新疆克拉通板块的裂解与拼合，塔里木盆地演化则经历了震旦纪—奥陶纪克拉通边缘裂陷盆地和志留纪—中泥盆世弧后前陆盆地两个阶段。巨层序Ⅰ代表克拉通边缘裂陷盆地演化阶段的产物：其中超层序 Ⅰ A 代表震旦纪裂谷盆地充填沉积；超层序Ⅰ B 和Ⅰ C 代表寒武纪—早奥陶世克拉通边缘坳陷盆地的沉积；超层序Ⅰ D 代表中、晚奥陶世弧后拉张盆地充填沉积。巨层序Ⅱ代表弧后前陆盆地演化阶段的产物：其中塔东地区超层序Ⅱ A 代表志留纪挤压挠曲为主的弧后前陆盆地充填沉积；塔西南地区超层序Ⅱ B 代表中、晚泥盆世主要以构造负荷作用为主的周缘前陆盆地充填沉积。层序地层的研究表明，构造作用在大部分Ⅲ级层序形成中起着决定性的作用，只是在寒武纪—早奥陶世盆地处在稳定的被动大陆边缘盆地和克拉通盆地演化时期，全球海平面的升降变化才对其层序的形成起着重要的作用。Abstract: The Sinian—Middle Devonian System in the Tarim Basin can be divided into two I order sequences (megasequences), six II order sequences (supersequences) and seventeen III order sequences (sequences). The geotectonic evolution is characterized by the splitting and closing cycle of the Paleo-Xinjiang cratonic plate from the Sinian era to Middle Devonian period. The evolution of Tarim Basin underwent the craton marginal rift basin stage (Z-O) and the retro arc foreland basin stage (S-D2). The Megasequence I was composed of sediments of the craton marginal rift basin stage, of which the SupersequenceⅠA was the filling product of the continental rift basin filling during the Sinian era, the SupersequenceⅠB and the SupersequenceⅠC were the fills of the passive continental marginal depressional basin from the Cambrian era to the early Ordovician period, and the SupersequenceⅠD was the fills of the retro arc tensional basin in the middle-late Ordovician period. The MegasequenceⅡ standed for the sedimentation of the retro arc foreland basin stage, of which the SupersequenceⅡA in the East Tarim was the fills of retro arc foreland basin in the Silurian era and the SupersequenceⅡB was the filling product of the peripheral foreland basin in the early and middle Devonian period. It was proved by the study of the sequence stratigraphy of the Sinian～Middle Devonian system in the Tarim Basin that the tectonism controlled the formation of most of the 3-orders sequences. The eustasy finally played an important role in the formation of most of the sequences during the stable passive continental marginal depressional basin and intra-craton depressional basin evolution stage.
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Key words:
- Tarim Basin /
- the Sinian&mdash /
- Middle Devonian /
- tectonism /
- sequence /
- geotectonic cycle /
- eustasy
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