济阳坳陷东营凹陷古近系沙河街组遗迹群落及其沉积环境  

Ichnocoenoses and Their Sedimentary Enyvironments of the Shahejie Formation of Paleogene in Dongying Sags, Jiyang Depression, Shandong Province

作　　者：胡斌[1] 王海方[1] 张宏敏 牛永斌[1] 白忠凯[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454003

出　　处：《河南理工大学学报（自然科学版）》2005年第3期186-191,共6页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金项目(40372013)河南省自然科学基金项目(031105300)

摘　　要：通过对40口钻井岩心的仔细观察和系统描述,在济阳坳陷东营凹陷古近系沙河街组中发现遗迹化石21个遗迹属,26个遗迹种.根据这些遗迹化石的组成、分布及围岩特征, 可以划分出四个遗迹化石群落,即①Skolithos遗迹群落,主要由居住迹和进食迹组成,它们常被解释这形成于较强水动力条件下的滨湖、河道沉积和浊积扇的上扇部分; ②Mermoides遗迹群落,以牧食迹或觅食拖迹为主,常含少量消化迹,该遗迹群落可被解释为产出于半深湖沉积环境;③Semirotundichnus遗迹群落,主要由觅食拖迹和耕作迹组成,它们均产出于深湖沉积环境;④Macaronichnus遗迹群落,由觅食迹、居住迹和古植物根迹等组成,反映了中等能量和低能水体交替变化的沉积环境.Based on the careful observation and systematic description of 40 wells, at least 21ichnogenera and 26 inchnospecies have been found in the Shahejie formation of Paleogene in Dongying Sags of Jiyang Depression, Shandong Province. According to the composition and distribution characteristics of these trace fossils and their country rock features, four types of ichnocoenosis under different sedimentary environments can be established as follows： （1） Skolithos ichnocoenosis, They areoffen explained forming in relatively high energy shore lake, riverway and turbidite fan （outer fan） deposit setting. （2） Mermoides ichnocoenosis, generates in mid-deep lacustrine sedimentary environment. （3） Semirotundichnus ichnocoenosis, forms in deep lacustrine sedimentary environment. （4） Macaronichnus ichnocoen6sis, generally occurs in the alternating sedimentary setting between medium and low-size energy water bodies.

关 键 词：古遗迹学 遗迹化石群落 东营凹陷 古近系 沙河街组 

分 类 号：P534.52[天文地球—古生物学与地层学]