Trace Fossils and Transgressive Deposits，Transgressive Systems Tracts in Tataertage Formation ( Lower Sil urian )，Tarim Basin
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摘要: 在层序地层学研究中，海进（transgrssion）常被认为是快速形成的，序列简单，并以少量沉积为特征。对塔里木盆地下志留统塔塔埃尔塔格组痕迹化石及沉积特征研究表明，海进期沉积及海进体系域比人们想象的要复杂，由三类沉积组成：（1）与海进侵蚀有关，包括海进滞留沉积，发育固底控制Glossifungites痕迹相；（2）与海进初期的海面缓慢上升或总体海进过程中的静止期有关，包括前滨和临滨砂泥岩，发育Skolithos痕迹相和近端Gruziana痕迹相；（3）与海面快速上升有关，包括滨外泥岩，发育远端Gruziana痕迹相。Abstract: Transgression has been routinely regarded as to be rapidly accomplished，relatively simple in successionand commonly characteristic of deposit. Study on trace fossils and sedimentary features of Tataertage Forma-tion indicated that transgressive systems tracts possess their own unique complexities and can be grouped intothree main subdivisions:(1)the first group of fades is produced by the process of transgressive erosion includ-ing transgressive lags with Glossifungites ichnofacies;(2) the second one corresponds to those sediments de-posited while relative sea level is rising slowly or related to the stillstand cycle during an overall transgression，including foreshore and shoreface sandstones as well as mudstones with Skolithos ichnofacies and proximalCrzcziana ichnofacies(3)the last one reflects the rapid rising of relative sea level including offshore mudstoneswith distal Cruziana ichnofacies.
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Key words:
- trace fossil /
- transgressive systems tracts /
- Tataertage formation /
- facies assemblage /
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3 Posamentier H W, Allen S P, et al.Forced regressions on a se-quence stratigraphic framework;concepts.examples and explorationsignificance. AAPG Bulletin,1992,76:168 7-1790
4 Cant D J.,Geometric modelling of facies migraion:tlteoretical devel-opntent of facies successions and local unconformities. Basin Re-search.1991,3:51一62
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