摘要
文中较系统地研究了中国东部济阳坳陷车镇与沾化凹陷古近系遗迹化石的组成、分布和产状特征及其沉积环境 ,提出了三种古湖泊沉积环境中的遗迹化石群落 :(1 )Scoyenia遗迹群落 ,由Scoyenia、Beaconites、Taenidium、Planolites、Palaeophycus、Macaronichnus、Gordia、Skolithos、Ophiomorpha、Sagittichnus和Favreina等遗迹属组成 ,代表了经常干旱的滨浅湖或泛滥平原上的极浅水沉积环境 ;(2 )Mermoides遗迹群落 ,以Mermoides、Neonereites、Planolites、Helminthopsis、Helminthoidichnites、Vagorichnus和Cochlichnus等遗迹属为特征 ,指示半深湖或较深水湖沉积环境 ;(3)Macaronichnus遗迹群落 ,主要组成分子有Macaronichnus、Plano lites、Palaeophycus、Skolithos、Monocraterion、Arenicolites、Margaritichnus、cf Thalassinoides等遗迹属和须根迹 ,反映了中等能量与低能水体交替变化的沉积环境。
Based on the systematic research of the composition, distribution and taphonomy characteristics of trace fossils in the Shahejie Formation of Paleogene in Chezhen and Zhanhua Sags of Jiyang Depression, Shandong Province, three kinds of ichnocoenoses in the paleolacustrine sediments are suggested:(1)Scoyenia Ichnocoenosis, which consists of Scoyenia, Beaconites, Taenidium, Planolites, Palaeophycus, Macaronichnus, Gordia, Skolithos, Ophiomorpha, Sagittichnus,Favreina and so on, and may serve to represent a regularly desiccated sandy and muddy shore and extremely shallow lacustrine sedimentary environment;(2)Mermoides Ichnocoenosis, which is characterized by such deeper water pattern fossils as Mermoides, Neonereites, Planolites, Helminthopsis, Helminthoidichnites, Vagorichnus and Cochlichnus,and may display deeper lacustrine sedimentary environment;(3)Macaronichnus Ichnocoenosis, which mainly includes some common trace fossils as Macaronichnus, Planolites, Palaeophycus, Skolithos, Monocraterion, Arenicolites, Brevitubus, Margaritichnus, cf.Thalassinoides and other Rhizoliths, generally occurs in the alternating sedimentary setting between middle and low energy water bodies, such as lacustrine delta plain, delta-front sand bar, sand bank and storm deposit in the shallow lacustrine environment, and middle to outer fan turbidite deposits in the deeper lacustrine environment.
出处
《古地理学报》
CAS
CSCD
2003年第2期187-196,共10页
Journal of Palaeogeography：Chinese Edition
基金
国家"十五"科技攻关课题 (批准号 :2 0 0 1BA60 5A0 9)资助
关键词
济阳坳陷
沾化凹陷
古近系
遗迹化石
沉积环境
湖相沉积
陆相沉积
沙河街组
palaeoichnology, lacustrine deposit, ichnocoenoses, terrestrial deposit, Paleogene, Shahejie Formation, Jiyang Depression
