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.
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.
[1] 白云风,程日辉,王璞珺,刘万洙. 2006. 库鲁克塔格地区巷古勒塔格组瘤状灰岩及其沉积环境. 新疆地质, 24(4): 361-364. [Bai Y F,Cheng R H,Wang P J,Liu W Z.2006. Kurotague formation in kurotague region,tumor—like limestone and its depositing environment. Xinjiang Geology, 24(4): 361-364]. [2] 陈公信, 金经纬. 1996. 湖北省岩石地层矿产局. 湖北省岩石地层: 全国多重地层划分对比研究(42). 武汉: 中国地质大学出版社,1-284. [Chen G X,Jin J W.1996. Hubei lithostratigraphic minerals bureau. The rock formations in Hubei Province: Comparative study of multiple stratigraphic division in China. (42). Wuhan: China University of Geosciences Press,1-284] [3] 邓奇,王剑,汪正江,邱艳生,杨青雄,江新胜,杜秋定. 2013. 扬子北缘元古宇马槽园群时代归属新证据: 对地层对比和古地理格局的启示. 地质通报, 32(4): 631-638. [Deng Q,Wang J,Wang Z J,Qiu Y S,Yang Q X,Jiang X S,Du Q D.2013. New evidence for the age of the Macaoyuan Group on the northern margin of the Yangtze block,South China: Implications for stratigraphic correlation and palaeogeographic framework. Geological Bulletin of China, 32(4): 631-638] [4] 董兆雄,朱晓惠,侯方浩,方少仙,吴诒. 2002. 一种特殊瘤状灰岩的成因研究. 沉积学报, 20(1): 20-24. [Dong Z X,Zhu X H,Hou F H,Fang S X,Wu Y.2002. Study on Origin of Special Nodular Limestone. Acta Sedimentologica Sinica, 20(1): 20-24] [5] 范正秀,旷红伟,柳永清,彭楠,朱志才,王玉冲,夏晓旭,陈骁帅,郑行海. 2018. 扬子克拉通北缘中元古界神农架群乱石沟组叠层石类型及其沉积学意义. 古地理学报,20(4):545-561. [Fan Z X, Kuang H W, Liu Y Q, Peng N, Zhu Z C, Wang Y C, Xia X X, Chen X S, Zheng H H.2018. Types of stromatolites of the Mesoproterozoic Shengnongjia Group in northern margin of Yangtze Craton and their sedimentary significance. Jounal of Palaeogeography(Chinese Edition), 20(4): 545-561] [6] 胡宁. 1997a. 鄂西神农架地区中元古界乱石沟组岩相古地理. 矿物岩石, 17(1): 58-62. [Hu N.1997a. Lithofacies palaeogeoraphy of Luanshigou Formation of the Middle Proterozoic in Shennongjia Region of West Hubei,China. Mienrals and Rocks, 17(1): 58-62] [7] 胡宁. 1997b. 鄂西神农架地区中元古界石槽河组岩石特征及沉积环境. 华南地质与矿产,(2): 54-61. [Hu N.1997b. Petrological characters and sedimentary environment in Middle Proterozoic Shicaohe Formation of Shennongjia,Hubei Province. Geology and Mineral Resources of South China, (2): 54-61] [8] 江涛,华媚春. 1962. 神农架地质: 兼论中国南部震旦系的三分问题. 湖北省地质学会1962年年会论文集(一). [Jiang T,Hua M C.1962. Shennongjia geology and the three points three options for division of sinian system in southern China. Journal of Geological Society of Hubei Province] [9] 蓝光志,张廷山,高卫东. 1994. 川西北地区早志留世瘤状灰岩的类型、成因及意义. 西南石油学院学报, 16(3): 1-5. [Lan G Z,Zhang T S,Gao W D.1994. Classifieation,genesis and signifieance of nodular limestone of Early Silurian in NW Sichuan. Journal of Southwestern Petroleum Institute, 16(3): 1-5] [10] 李怀坤,张传林,相振群,陆松年,张健,耿建珍,瞿乐生,王志先. 2013. 扬子克拉通神农架群锆石和斜锆石U-Pb 年代学及其构造意义. 岩石学报, 29(2): 673-697. [Li H K,Zhang C L,Xiang Z Q,Lu S N,Zhang J,Geng J Z,Qu L S,Wang Z X.2013. Zircon and baddeleyite U-Pb geochronology of the Shennongjia Group in the Yangtze Craton and its tectonic significance. Acta Petrologica Sinica, 29(2): 673-697] [11] 李铨,冷坚. 1987. 神农架上前寒武系. 天津: 天津科学技术出版社,1-391. [Li Q,Leng J.1987. The upper Precambrian of Shennongjia. Tianjin: Tianjin Science and Technology Press,1-391] [12] 刘成新,毛新武,魏运许,何仁亮,余建华. 2004. 神农架群地层层序初探. 资源环境与工程,18(增刊): 5-16. [Liu C X,Mao X W,Wei Y X,He R L,Yu J H.2004. A preliminary research on stratigraphic sequence of Shennong Jia Group. Resources Environment & Engineering,18(Supp.): 5-16] [13] 刘成新,杨清富,毛新武,何仁亮,黄桂珍. 2013. 神农架地区新元古代青白口纪凉风垭组的建立. 资源环境与工程, 27(3): 238-245. [Liu C X,Yang Q F,Mao X W,He R L,Huang G Z.2013. Establishment of Neoproterozoic Liangfengya Formation in Shennongjia Region. Resources Environment & Engineering, 27(3): 238-245] [14] 柳永清,旷红伟. 2017. 神农架中新元古代沉积地质景观. 北京: 地质出版社,1-174. [Liu Y Q,Kuang H W.2017. Ancient sedimentary geological landscape of Meso—Neoproterozoic in Shennongjia. Beijing: Geological Publishing House,1-174] [15] 梅冥相,马永生,周丕康,苏德辰,罗光文. 1997. 碳酸盐岩沉积学导论. 北京: 地震出版社,1-306. [Mei M X,Ma Y S,Zhou P K,Su D C,Luo G W.1997. Introduction to Carbonate Sedimentology. Beijing: Earthquake Press,1-306] [16] 梅冥相. 2012. 鲕粒成因研究的新进展. 沉积学报, 30(1): 20-32. [Mei M X.2012. Brief introduction on new advances on the origin of ooids. Acta Sedimentologica Sinica, 30(1): 20-32] [17] 邱艳生,胡正祥,杨青雄,周世卿,田望学,李雄伟. 2013. 华南“马槽园群”年代及其地层学意义. 资源环境与工程, 27(3): 328-334. [Qiu Y S,Hu Z X,Yang Q X,Zhou S Q,Tian W X,Li X W.2013. LA-ICP-MS U—Pb Dating for the Macaoyuan Group in South China and its stratigraphic significance. Resources Environment and Engineering, 27(3): 328-334] [18] 王能盛. 2016. 神农架地区神农架群沉积相研究: 以神农顶剖面为例. 中国地质科学院硕士论文. [Wang N S.2016. Sedimentary Facies of the middle part of Shennongjia Group—an example from Shennongding section,Shennongjia Region. Dissertation of Master Degree of Chinese Academy of Geological Sciences] [19] 肖志斌. 2012. 中元古代扬子北缘神龙架地区沉积岩碎屑锆石研究. 西北大学硕士论文. [Xiao Z B.2012. Reseach of the detrital zircon from Mesoproterozoic sedimentary strata in the north margin of Yangtze Craton China. Dissertation of Master Degree of Northwestern University] [20] 夏晓旭,旷红伟,宋天锐,柳永清,彭楠,范正秀,王能盛,朱志才,王玉冲,陈骁帅,郑行海. 2018. 中元古代神农架群台子组沉积特征. 古地理学报,20(4):579-594. [Xia X X,Kuang H W,Song T R,Liu Y Q,Peng N,Fan Z X,Wang N S,Zhu Z C,Wang Y C,Chen X S,Zheng H H.2018. Sedimentary Characteristics of Mesoproterozoic Taizi Formation in Shennongjia Group. Journal of Palaeogeography(Chinese Edition),20(4):579-594] [21] 张永康. 2009. 扬子板块东北缘中元古代的大地构造划分. 资源调查与环境, 28(3): 162-167. [Zhang Y K.2009. Middle Proterozoic geotectonics in the northeast margin of the Yangtze plate. Resources Environment & Engineering, 28(3): 162-167] [22] Nutman A P, Bennett V C, Friend C R, Van Kranendonk M J, Chivas A R.2016. Rapid emergence of life shown by discovery of 3,700-million-year-old microbial structures. Nature, 537: 535-538. [23] Allwood A C,Walter M R,Burch I W,Kamber B S.2007.3.43 billion-year-old stromatolite reef from the Pilbara Craton of Western Australia: Ecosystem-scale insights to early life on Earth. Precambrian Research, 158(3): 198-227. [24] Dietrich H G,Klosa D,Wittich C.2000. Carbonate contents in CRP—2/2A,Victoria Land,Antarctica. Terra Antarctia, &(3):389-391. [25] Du Q D,Wang Z J,Wang J,Qiu Y S,Deng Q,Yang F.2016. Geochronology and geochemistry of tuff beds from the Shicaohe Formation of Shennongjia Group and tectonic evolution in the northern Yangtze Block,South China. International Journal of Earth Sciences, 105(2): 521-535. [26] Folk R L.1973. Carbonate petrography in the post-Sorbian age: Papers in honour of Pettijohn F J. Johns Hopkins University,Baltimore,Studies in Geology, 21: 118-158. [27] Maliva R G,Siever R.1989. Nodular Chert Formation in Carbonate Rocks. The Journal of Geology, 97(4): 421-433. [28] Mullins H T,NeuMann A C,Wilber R J,Boardman M R.1980. Nodular carbonate sediment on Bahamian slopes: Possible percursors to nodular limestones. Journal of Sedimentary Petrology, 50(1): 117-131. [29] Qiu X F,Ling W L,Liu X M,Kusky T,Berkana W,Zhang Y H,Gao Y J,Lu S S,Kuang H,Liu C X.2011. Recognition of Grenvillian volcanic suite in the Shennongjia region and its tectonic significance for the South China Craton. Precambrian Research, 191(3): 101-119. [30] Riding R.2011. The Nature of Stromatolites: 3,500 Million Years of History and a Century of Research. In: Reitner J et al.(eds). Advances in Stromatolite Geobiology.Lecture Notes in Earth Science. Berlin: Springer-Verlag,29-74. [31] Rudnitzki I D,Romero G R,Hidalgo R,Nogueira A C R.2016. High frequency peritidal cycles of the upper Araras Group: Implications for disappearance of the neoproterozoic carbonate platform in southern Amazon Craton. Journal of South American Earth Sciences, 65: 67-78. [32] Tang D,Shi X,Shi Q,Wu J,Song G,Jiang G.2015. Organomineralization in Mesoproterozoic giant ooids. Journal of Asian Earth Sciences, 107: 195-211. [33] Tucker M E,Wright V P.1990. Carbonate Sedimentology. Oxford London: Blackwell Publishing. [34] Wang J,Deng Q,Wang Z J,Qiu Y S,Duan T Z,Jiang X S,Yang Q X.2013. New evidences for sedimentary attributes and timing of the “Macaoyuan conglomerates”on the northern Margin of the Yangtze block in southern China. Precambrian Research, 235: 58-70. [35] Wilson J L.1975. Carbonate Facies in Geologic History. New York: Springer Verlag,471.
