塔里木盆地志留系遗迹化石组合及其沉积环境

依据化石生态和沉积学特征 ,系统地研究了塔里木盆地志留系遗迹化石的组成、分类及其沉积环境 ,认为存在 4种遗迹化石组合 :①Palaeophycus Planolites遗迹组合 ,由进食潜穴、滤食居住潜穴和觅食迹组成 ,包括Planolites,Palaeophycus,Macaronichnus,Skolithos,Ophiomorpha和Taenidium等遗迹属 ,反映了潮间带混合坪沉积环境 ;②Skolithos遗迹组合 ,由居住潜穴组成 ,常见遗迹属有Skolithos,Ophiomorpha ,Arenicolites,Thalassinoides和Cylindrichnus,代表了前滨或潮下带砂坪沉积环境 ;③Planolites Taenidium遗迹组合 ,以进食潜穴和居住潜穴为特征 ,主要组成分子有Taenidium ,Planolites,Palaeophycus,Skolithos,Arenicolites和Thalassinoides等遗迹属 ,指示了具有周期性风暴影响的过渡带沉积环境 ;④Helminthopsis遗迹组合 ,主要由觅食迹组成 ,其中以Helminthopsis和Zoophycos遗迹属最为常见 ,表明了低能的滨外环境

Silurian ichnoassemblages of Talimu Basin and their sedimentary environments

Based on the systematic research of the compositions, sorts and sedimentary environments of ichnofossils from Silurian of Talimu Basin, it is held that there are four kinds of ichnoassemblages: (1) Palaeophycus-Planolites ichnoassemblage, which is composed of fodinichnia, domichnia and pascichnia including Planolites, Palaeophycus, Macaronichnus, Skolithos, Ophiomorpha, Taenidium and so on, and may display mixed flat sedimentary environment; (2) Skolithos ichnoassemblage, which consists of Skolithos, Ophiomorpha, Arenicolites, Thalassinoides and Cylindrichnus, and may represent such sedimentary environments as foreshore and sand flat; (3) Planolites-Taenidium ichnoassemblage, which is characterized by such fodinichnia and domichnia as Taenidium, Planolites, Palaeophycus, Skolithos, Arenicolites and Thalassinoides, generally indicates transition zone sedimentary environment periodically influenced by storm; (4) Helminthopsis ichnoassemblage, which is mainly composed of pascichnia, occurs in offshore sedimentary environment with low hydrodynamic condition.