Stromatolite characteristics of Mesoproterozoic Shennongjia Group in the northern margin of Yangtze Block, China  

作　　者：Hong-wei Kuang Zheng-xiu Fan Yong-qing Liu Nan Peng Zhi-cai Zhu Zhen-rui Yang Zhi-xian Wang Hui-liang Yu Quan Zhong 

机构地区：[1]Institute of Geology,Chinese Academy of Geological Sciences,Beijing,100037,China [2]College of Resources and Environment,Yangtze University,Wuhan,430100,China [3]Administration of Shennongjia National Park,Shengnongjia,Hubei,442421,China

出　　处：《China Geology》2019年第3期364-381,共18页中国地质（英文）

基　　金：This research was co-supported by the National Key Research and Development Program of China (2016YFC0601001),the National Natural Science Foundation of China (41472082);China Geological Survey Projects (DD20160120-01);Globe Geopark of Shennongjia. We are grateful to the leaders of Shennongjia National Park and Mr. Zhixian Wang,Quan Zhong gave great assistances and warmly aids;the field survey was under careful direction by Mr. Lesheng Qu from Hubei Geological Survey,Mr. Yuansheng Geng from Institute of Geology,CAGS. Sincere thanks are also given Mr. Zejiu Wang,Xin Shang and Mrs. Xiulan Ma from Chinese Academy of Geological Sciences (CAGS) and All China Commission of Stratigraphy.

摘　　要：Mesoproterozoic Shennongjia Group in Shennongjia Area can be divided into three subgroups in ascender order. Of which the lower subgroup includes Yingwodong, Dayanping, Macaoyuan, Luanshigou, Dawokeng and Kuangshishan formations;the middle subgroup is formed by Yemahe, Wenshuihe and Shicaohe formations;the upper subgroup consists of Songziyuan and Wagangxi formations. Stromatolites developed very well in the carbonate rocks of each subgroup in Shennongjia Group. Based on descriptions of stromatolites macrotypes and their characteristics, this paper studied the formation environments, discussed the relationship among types, sizes, abundance of stromatolites and sedimentary environment, and established the formation and development pattern of stromatolites. As a result, this research also reveals the paleoenvironment and paleoclimate during the period of the Shennongjia Group deposited, which is beneficial to the study of paleoenvironment, paleogeography and paleoclimate, stratigraphic succession and regional correlation of the northern edge of Yangtze block. Stromatolites of Shennongjia Group are mainly conical, columnar, domal, wavy, stratiform and stromatolite reefs. The columnar and conical stromatolites are well developed. Conical stromatolites are mainly monomers, with a variety of pyramidal types, ranging in diameter from a few millimeters to several meters and formed in the high energy subtidal zone and tidal lagoon environment. Most of the columnar stromatolites are medium to small sizes implied a wide and gentle slope environment at that time. Stratiform (including wavy) stromatolites are larger scales and extends far away and distributed most widely in almost every horizon in the carbonate rocks. Stratiform stromatolites can be formed in low energy environments such as subtidal and intertidal zones and supratidal belts. Wavy stromatolites often developed in the hydrodynamic energy condition from weak energy intertidal zone gradually strengthened to the below of the high energy supratidal. Although stroma

关 键 词：STROMATOLITE MESOPROTEROZOIC Shennongjia Group Shennongjia Area Northern MARGIN of YANGTZE CRATON GEOLOGICAL survey engineering China 

分 类 号：P[天文地球]