松辽盆地上白垩统陆相遗迹化石及其沉积环境  

Continental trace fossils and their sedimentary environments of the Upper Cretaceous in Songliao Basin

作　　者：郑玉龙[1] 陈春瑞[1] 任林伟[1] 

机构地区：[1]中国石油大庆油田公司勘探开发研究院,黑龙江大庆163712

出　　处：《古地理学报》2005年第3期337-346,共10页Journal of Palaeogeography：Chinese Edition

摘　　要：松辽盆地上白垩统中含有丰富的遗迹化石,通过对该盆地20余口取心井岩心的详细观察,发现了6大类动物遗迹化石15属20种。根据这些遗迹化石的分布规律,在松辽盆地上白垩统中划分出5种遗迹化石组合(1)Scoyenia遗迹组合,主要成分有Scoyeniagracilis、Skolithos和Planolites,偶见停息迹化石,反映的是遭受周期性暴露的极浅水环境;(2)Skolithos遗迹组合,主要以Skolithos和Cylindricum十分发育为特征,分异度小,丰度高,反映的是高能动水环境;(3)Arenicolites遗迹组合,主要以Arenicolites和Polykladichnus大量发育为特征,还见有Skolithos、Planolites、Thalassinoides和逃逸迹等化石,分异度较高,反映了水流能量较低的浅水环境;(4)Planolites遗迹组合,以密集分布的Planolites十分发育为特征,分异度小,丰度高,见有少量指示缺氧环境的Chondrites化石,反映了水体较平静的还原环境;(5)Fuersichnus遗迹组合,主要由Fuersichnus、Glockeria、Gordia、Megagrapton和Planolites等遗迹分子构成,反映了相对平静的深水环境。Trace fossils are abundant in the Upper Cretaceous in the Songliao Basin. Based on the observation of cores of 20 wells, 6 types of trace fossils including 15 genera and 20 species are identified in the basin. According to the distribution of these trace fossils in the Songliao Basin, 5 ichnoassemblages are distinguished in the Upper Cretaceous as： （1） Scoyenia ichnoassemblage, which mainly includes Scoyenia gracilis, Skolithos, Planolites and Cubichnia, represents shallow water sedimentary environments with periodical exposure; （2） Skolithos ichnoassemblage, which is characterized by the abundance of Skolithos and Cylindricum with low diversity, reflects high energy environments; （3） Arenicolites ichnoassemblage, which is composed of Arenicolites, Polykladichnus, Skolithos, Planolites, Thalassinoides and Fugichnia with high diversity, represents shallow and low energy environments; （4） Planolites ichnoassemblage, which is dominated by rich Planolites and Chondrites with low diversity, indicates anoxic quiet water environments; （5） Fuersichnus ichnoassemblage, which contains Fuersichnus, Glockeria, suggests deep and relatively quiet water environments.

关 键 词：遗迹化石 沉积环境 松辽盆地 上白垩统 遗迹化石组合 陆相 动水环境 分异度 分布规律 主要成分 

分 类 号：P534.31[天文地球—古生物学与地层学] P618.130.2[天文地球—地质学]