Recognition of geological age for acanthomorphic acritarchs from the Ruyang Group,southern margin of North China Craton and its implication for evolution of early eukaryotes
Peng Nan1, Kuang Hong-Wei1, Liu Yong-Qing1, Geng Yuan-Sheng1, Xia Xiao-Xu1,2, Wang Yu-Chong1,2, Chen Xiao-Shuai1, Zheng Hang-Hai2
1 Key Laboratory of Stratigraphy and Paleontology,Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037; 2 China University of Geosciences(Beijing),Beijing 100083
Abstract The geological age of eukaryotes represented by large acanthomorphic acritarchs from the Ruyang Group,southern margin of North China Craton,has been controversial. New zircon SHRIMP U-Pb age of tuff(ca. 1639±13Ma)was obtained from the Luoyukou Formation of the Luoyu Group,Yangpo,Ruzhou,west Henan Province. This new age,combined with the ages from the Xiong'er and Ruyang Group,can well constraint the time of these eukaryotes with complex morphology from the Ruyang Group at 1.75-1.64Ga,which belongs to early Mesoproterozoic. Moreover,it shows that some eukaryotes with relatively higher degree of evolution,which were previously thought to be preserved in the Neoproterozoic,may have appeared in the Early Mesoproterozoic. We further suspect that there might be more primitive microfossils preserved in the older strata(>1.6Ga)in the southern margin of the North China Craton,which provides an important window to explore the ancestor of the eukaryote. Thus,caution should be taken when applying these Mesoproterozoic eukaryotes for stratigraphic correlation.
Fund:Co-funded by the National Key Research and Development Program of China(No.2016YFC0601001),the National Natural Science Foundation of China(No.41472082),China Geological Survey Projects(Nos.1212011120142,DD20160120-01) and the Project of Shennongjia Global Geopark
Corresponding Authors:
Kuang Hong-Wei,born in 1969,is a professor and doctoral supervisor in the Institute of Geology,CAGS. She is mainly engaged in sedimentology. E-mail: kuanghw@126.com.
About author: Peng Nan,born in 1983,is a research assistant in the Institute of Geology,CAGS. He is mainly engaged in sedimentary geology and palaeogeography. E-mail: pengnan19830120@126.com.
Cite this article:
Peng Nan,Kuang Hong-Wei,Liu Yong-Qing et al. Recognition of geological age for acanthomorphic acritarchs from the Ruyang Group,southern margin of North China Craton and its implication for evolution of early eukaryotes[J]. JOPC, 2018, 20(4): 595-608.
Peng Nan,Kuang Hong-Wei,Liu Yong-Qing et al. Recognition of geological age for acanthomorphic acritarchs from the Ruyang Group,southern margin of North China Craton and its implication for evolution of early eukaryotes[J]. JOPC, 2018, 20(4): 595-608.
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