ICHNOCOENOSES AND THEIR SEDIMENTARY ENVIRONMENTS OF THE SHAHEJIE FORMATION OF PALEOGENE IN CHEZHEN AND ZHANHUA SAGS, JIYANG BASIN, SHANDONG PROVINCE
Lü Xixue Hu Bin Jiang Zaixing Chen Shiyue Li Shoujun
1 Department of Earth Science of Zhejiang University,Zhejiang Hangzhou 310027
2Limited Company of Shengli Oilfield, Dongying, 257001 Shandong
3Jiaozuo Institute of Technology, Jiaozuo, 454000 Henan
4Petroleum University, Dongying, 257000 Shandong
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, Jiyang Depression , Shandong province, this paper suggests three kinds of ichnocoenoses in the paleo-lacustrine sediments: (1) Scoyenia Ichnocoenosis, which consists of Scoyenia, Beaconites, Taenidium, Planolites, Palaeophycus, Macaronichnus, Gordia, Skolithos, Ophiomorpha, Sagittichnus and Favreina and so on, 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, Vagrichnus and Cochlichnus, 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 interchange sedimentary setting between middle and low energy water bodies, such as lacustrine delta plain, delta-front sand bar, sand bank and storm sediments in the shallow lacustrine environment, and middle to outer fan turbidite deposits in the deeper lacustrine environment.
. ICHNOCOENOSES AND THEIR SEDIMENTARY ENVIRONMENTS OF THE SHAHEJIE FORMATION OF PALEOGENE IN CHEZHEN AND ZHANHUA SAGS, JIYANG BASIN, SHANDONG PROVINCE[J]. JOPC, 2003, 5(2): 187-196.
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