Sedimentary characteristics of the Mesoproterozoic Taizi Formation of Shennongjia Group in northern margin of Yangtze Craton
Xia Xiao-Xu1,2, Kuang Hong-Wei2, Song Tian-Rui2, Liu Yong-Qing2, Peng Nan2, Zhu Zhi-Cai2, Xu Huan2, An Wei2, Wang Neng-Sheng2, Fan Zheng-Xiu2, Wang Yu-Chong1,2
1 China University of Geosciences(Beijing),Beijing 100083; 2 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037
Abstract：Sedimentary environments of the Mesoproterozoic Taizi Formation of Shennongjia Group in Shengnongjia area, northern margin of Yangtze Craton are all along in debate. In this study,we further constrain the sedimentary environments of the Taizi Formation based on the comprehensive field and laboratory experiments. The lower part of the Taizi Formation consists of gray green silty-fine dolostone. The middle part of the Taizi Formation is composed of gray green,grayish quartz medium-fine sandstones,siltstones and dark grey siltstones,silty mudstones,muddy siltstones rhythms,while its upper part comprises siltstone-mudstone rhythm. Massive beddings and parallel beddings occur in the quartz sandstone,while siltstones and mudstones contain the horizontal and lenticular beddings. The cumulative probability curve of sandstones shows a steep slope,which are made up mainly of jumping components with two or more groups and little suspended components without rolling components. The sedimentary structures and grain size characteristics suggest that the Taizi Formation was formed in the coastal and tidal flat depositional environments. Meanwhile,the vertical sedimentary sequences are represented by the grain size evolution of coarse-fine-coarse-fine,which is combined with that the sedimentary facies from the bottom to the top show littoral facies-carbonate ramp platform facies-lagoon facies-tidal flat lagoon facies succession,constitute a complete transgressive-regressive sedimentary sequence with patterns of progradation-retrogradation-progradation.
Xia Xiao-Xu,Kuang Hong-Wei,Song Tian-Rui et al. Sedimentary characteristics of the Mesoproterozoic Taizi Formation of Shennongjia Group in northern margin of Yangtze Craton[J]. JOPC, 2018, 20(4): 563-578.
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