Sedimentary characteristics of the Mesoproterozoic Shennongjia Group in northern margin of Yangtze Craton
Kuang Hong-Wei1, Liu Yong-Qing1, Fan Zheng-Xiu1, Peng Nan1, Geng Yuan-Sheng1, Zhu Zhi-Cai1, Xu Huan1, An Wei1, Wang Neng-Sheng1, Xia Xiao-Xu1,2, Wang Yu-Chong1,2
1 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037; 2 China University of Geosciences(Beijing),Beijing 100083
Abstract The Shennongjia Group(ca. 1400-1000Ma)in the northern margin of the Yangtze Craton in northwestern area of Hubei Province consists of the Dayanping,Macaoyuan,Luanshigou,Dawokeng and Kuangshishan Formations in ascending order in its lower subgroup,the Taizi,Yemahe,Wenshuihe and Shicaohe Formations from the base to top in its middle subgroup and the Songziyuan and overlying Wagangxi Formations in its upper subgroup. Each subgroup was deposited as relatively deep water clastics and then as shallow water carbonates. According to a series of rock association,macroscopic and microscopic depositional fabric and structures,four types of sedimentary assemblages including peritidal algal carbonates,shallow marine clastics,platform margin shoal carbonates,and foreslope carbonates were recognized in the Shennongjia Group. They were deposited in a gentle dipping carbonate platform setting with a distally steepened slope. The peritidals are distributed most widely and are composed of peritidals carbonates,and different types of stromatolites were developed. They consitute a shallowing upward sequence with a strong progradation. Dry cracks and evaporates are common. They were deposited as shallow subtidal,tidal flat and supratidal facies. The shallow marine clastic sedimentary assemblage is mainly composed of sandstones,siltstones and mudstones and developed mainly in the Taizi and Dayanping Formations. Well-sorted and rounded quartz sandstones,common autochthonous glauconite in sandstones and autochthonous pyrites in mudstones,parallel bedding,horizontal and wavy bedding show that the Taizi Formation generally experienced a highly frequent sea level fluctuation. As a result,the sedimentary facies changed from coastal beach-platform margin shoal,to deep and shallow shelf sandy barrier-detrital tidal flat-restricted platform. The high energy shoal at the edge of the platform is mainly found in the Luanshigou and Yemahe Formations. It is characterized by oolitic dolomites,dolorudites(or intraclastic dolomite)and conical and columnar stromatolites. The Dawagou and Shicaohe Formations are characterized by oolitic and dolarenite-dolorudites and algal detritus(and lumps or phosphates). Large-medium scale cross bedding,grading bedding,and scour and erosion structures show an environment with strong hydrodynamic conditions in a shallow subtidal setting. The lenticular,thick,tremendous to coarse breccias and sandstones from collapse were developed in the Dayanping and Macaoyuan Formations. Sedimentary structures,such as cross bedding,ripple mark,scour and erosional structures,represent the foreslope and shallow water shelf environment. This study provides basic data and evidence for the sedimentary evolution and reconstruction,the depositional process of the basin and sequence correlation of the Late Mesoproterozoic in the Yangtze Craton for further studies of the sedimentary sequence,sedimentary characteristics and sedimentary evolution process of the Shennongjia Group.
Fund:Co-funded by the National Key Research and Development Program of China(No.2016YFC0601001), the National Natural Science Foundation of China(No.41472082), the China Geological Survey Projects(Nos. 1212011120142, DD20160120-01)and the Project of Shennongjia Global Geopark
About author: Kuang Hong-Wei,born in 1969,is a professor and doctoral supervisor in the Institute of Geology,CAGS. She is mainly engaged in sedimentology,stratigraphy and petroleum geology. E-mail: kuanghw@126.com.
Cite this article:
Kuang Hong-Wei,Liu Yong-Qing,Fan Zheng-Xiu et al. Sedimentary characteristics of the Mesoproterozoic Shennongjia Group in northern margin of Yangtze Craton[J]. JOPC, 2018, 20(4): 523-544.
Kuang Hong-Wei,Liu Yong-Qing,Fan Zheng-Xiu et al. Sedimentary characteristics of the Mesoproterozoic Shennongjia Group in northern margin of Yangtze Craton[J]. JOPC, 2018, 20(4): 523-544.
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