Microfossils and Paleoenvironmental Significance of Late Paleoproterozoic Ruyang Group in South Margin of North China Craton: Evidence from Microstructure and Biomarker

被引：0
|
作者：
Li M. [1 ,2 ]
Wang Z. [3 ]
Yao Z. [4 ]
机构：
[1] Xi'an Center of Geological Survey, Orogen Research Center, China Geological Survey, Xi'an
[2] Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Natural Resources, Xi'an
[3] No.711 General Party, Northwest Nonferrous Geological Exploration Co. Ltd., Hanzhong
[4] Xi'an Northwest Nonferrous Chemical Exploration Team Co. Ltd., Xi'an
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 11期
关键词：
Baicaoping Formation; Biomarker compound; Microfossil; Paleobiology; Paleoproterozoic; Ruyang Group;
D O I：
10.3799/dqkx.2021.006
中图分类号：
学科分类号：
摘要：
There are a large number of acritarchs with spines and fine reticular patterns, well exposed in the shale of Baicaoping Formation of Ruyang Group in western Henan, such as Shuiyousphaeridium macroreticulatum and Dictyosphaera macroreticulata which are the most representative fossil specimens. In this paper, the microscopic structure of the membrane shell was observed by scanning electron microscope combined with optical biological microscope. Moreover, the two representative fossil specimens (Shuiyousphaeridium macroreticulatum and Dictyosphaera macroreticulata) may be produced at different stages of the same organism. These features not only reveal more information about the original characteristics of the microbe, but also enrich the morphological classification of the microfossils in Ruyang Group. In addition, based on the analyses of biomarker from shale with microfossils, it shows that pristane/phytane ratio (Pr/Ph) is greater than 1, the abundance of gammacerane is medium and there is biomarker (C30 hopane, C27 sterane and tricyclic terpane), which not only indicates that the paleoenvironment of microfossils in Ruyang Group should be normal marine environment-coastal-shallow sea facies, but also indicates the existence of Proterozoic eukaryotes, which provides an important theoretical basis for the reconstruction of microfauna and the discussion of the evolution of early life. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：4072 / 4083
页数：11
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