华北东濮凹陷沙河街组藻类化石所记录的地质事件  

GEOLOGICAL EVENTS RECORDED IN ALGAL FOSSILS OF SHAHEJIE FORMATION, DONGPU DEPRESSION,NORTH CHINA

作　　者：范迎风[1] 顾勤[1] 黄俊峰[1] 高渐珍[1] 

机构地区：[1]中石化集团中原油田分公司勘探开发科学研究院,河南457001

出　　处：《微体古生物学报》2002年第3期316-321,共6页Acta Micropalaeontologica Sinica

摘　　要：东濮凹陷早第三纪沙河街组产有丰富的藻类化石 ,淡水藻类与半咸水、咸水藻类相互交替的两个旋回在纵向上分布明显 ,即 :沙四、沙二段为淡水藻类 (主要为轮藻 )发育期 ,沙三、沙一段为咸水、半咸水藻类 (主要为沟鞭藻 )发育期。根据藻类化石的生态分析 ,认为沙三、沙一段沉积期湖水的咸化事件是由海侵造成的。The Shahejie Formation in Dongpu Depression contains prolific alga fossils. Their vertical distribution shows two alternating periods of freshwater algae and brackish water algae. The members S 4 and S 2 of the Shahejie Formation belong to the development period of freshwater algae (mainly charophytes while the members S 3 and S 1 belong to the development period of saltwater and brackish water algae(mainly dinoflagellates). It is thought that the salinizing events during S 3 and S 1 were coursed by sea transgression.

关 键 词：华北东濮凹陷 沙河街组 藻类化石 地质事件 古生态 

分 类 号：Q914.82[天文地球—古生物学与地层学] P53[生物学—古生物学]