NDLI: Cambrian ichnofossils from the Zhoujieshan Formation (Quanji Group) overlying tillites in the northern margin of the Qaidam Basin, NW China

Content Provider	Springer Nature Link
Author	Wang, Yue Wang, Xunlian Wang, Ye
Copyright Year	2015
Abstract	The Quanji Group is composed of siliciclastics and carbonates and was deposited on a relatively stable block, in the northern margin of the Qaidam Basin, NW China. It is one of the research hotspots in the Qilian-Qinling-Kunlun tectonic zones. However, it has long been argued whether the upper Quanji Group should be assigned to the Precambrian or the Cambrian for lack of convincing fossil evidence. The discovery of ichnofossils, including Rusophycus, Cruziana, Dimorphichnus, Treptichnus, Skolithos, Arenicolites, Palaeophycus, and Helminthopsis, indicates that the upper member of the Zhoujieshan Formation (top Quanji Group) is Cambrian in age, and at least above the Treptichnus (Phycodes) pedum Biozone, the lowermost biozone in the Cambrian. The lower member of the Zhoujieshan Formation should belong to the Cambrian. During the time when the upper member of the Zhoujieshan Formation was deposited, the northern margin of the Qaidam Basin was dominated by the Cruziana Ichnofacies, characterizing a lower-energy shelf (shallow) sea environment with moderate-rich oxygen contents. In addition, the conglomerates in the Hongtiegou Formation of the Quanji Group underlying the Zhoujieshan Formation were generally regarded as tillites. However, the dolostones of the lower member of the Zhoujieshan Formation are, in lithology and geochemistry, different from the typical cap-dolostones of the Doushantuo Formation in South China, so it is necessary to further study the origins of the lower member of the Zhoujieshan Formation and the conglomerates of the Hongtiegou Formation.
Starting Page	203
Ending Page	210
Page Count	8
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	26
Issue Number	2
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2015-04-11
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cambrian ichnofossil Zhoujieshan Formation Quanji Group Daqaidam NW China Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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