塔里木盆地西北缘志留系塔塔埃尔塔格组上段的遗迹化石

TRACE FOSSILS FROM THE UPPER MEMBER OF LOWER SILURIAN TATAAIERTAGE FORMATION, KALPIN AREA, TARIM BASIN, XINJIANG, CHINA

通过对塔里木盆地柯坪地区志留系塔塔埃尔塔格组上段遗迹化石的研究,识别出8属8种。根据组成、产状、分布规律及其围岩沉积特征,划分为2种不同沉积环境条件下的遗迹组合,即(1)Thalassinoides-Maca-ronichnus遗迹组合,主要组成分子有Thalassinoides suevicus,Macaronichnus segregatis和Rhizocorallium ganx-iensis等,形成于高氧高能的砂坪沉积环境;(2)Scoyenia-Beaconites遗迹组合,常见组成分子有Scoyenia gracilis,Beaconites antarcticus,Planolites vulgaris,Palaeophycus wutingensis和Monocraterioncf.tentaculatum,形成于混合坪-泥坪沉积环境。

Based on the study of the Silurian sections in the Kalpin area of the northwestern Tarim Basin, eight ichnogenus and eight ichnospecies were recognized in the Lower Silurian Tataaiertage Formation. According to the composition, occurrence and distribution characteristics of these trace fossils and their host rock features, two types of ichnoassemblages under different sedimentary environments have been proposed as follows： 1 ）Thalassinoides-Macaronichnus ichnoassemblage, including such common trace fossils as Thalassinoides suevicus ,Macaronichnus segregatis and Rhizocorallium ganxiensis, indicating a sand flat sedimentary environment with high oxygen content and energy; and 2） Scoyenia-Beaconites ichnoassemblage, containing such trace fossils as Scoyenia gracilis, Beaconites antarcticus, Planolites vulgaris , Palaeophycus wutingensis and Monocraterion cf. tentaculatum, suggesting a mixed sand flat-mud flat sedimentary environment with mid-low energy condition.