Redefinition of Meso-Neoproterozoic stratigraphy in the Shennongjia-Kongling area on the northern margin of Yangtze Craton -- discussion on the bottom of the Shennongjia Group
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摘要: 综合近几年来扬子克拉通北缘中新元古代最新研究成果，厘定扬子克拉通北缘神农架-崆岭地区中新元古代地层序列，自下而上依次为：吴家台组、神农架群、马槽园组、南沱组、陡山沱组和灯影组。吴家台组仅出露于距神农架不到20 km的北崆岭西汊河地区，为一套浅变质砾岩-含砾砂岩-细砂岩-白云岩组合，与下伏古元古界黄凉河岩组、上覆南华系南沱组均呈角度不整合接触，详细的年代学工作限定其形成时代为~1800-1500 Ma，代表扬子克拉通核部中元古代最早期沉积记录，可视作与神农架群底部-下部相当的层位（吴家台组与神农架群未见直接的接触关系露头）。神农架群主要岩性为藻礁白云岩、泥粉晶白云岩、粉砂岩等，夹砾岩、细砂岩、泥岩、火山岩层，与上覆马槽园组角度不整合接触，不见底，形成于~1.4-1.0 Ga。马槽园组为一套白云质或砂质胶结的杂砾岩、白云质砾岩，角度不整合于神农架群和南沱组之间。南沱组为杂砾岩-含砾粉砂质泥岩-碳质泥岩组合，形成时代为~657-635 Ma，属 Marinoan冰期产物。陡山沱组、灯影组为碳酸盐岩建造，是扬子克拉通基底之上第一套稳定盖层，沉积时限为~635-541 Ma，也是早期生命演化的关键时期。Abstract: The Meso-Neoproterozoic stratigraphic sequences in the Shennongjia-Kongling area on the northern margin of the Yangtze Craton are redefined based on the recent research, which are Wujiatai Formation, Shennongjia Group, Macaoyuan Formation, Nantuo Formation, Doushantuo Formation and Dengying Formation in ascending order. The Wujiatai Formation rocks are only exposed in the Xicha River, Northern Kongling area, less than 20 km from the Shennongjia Group, which are a set of epimetamorphic conglomerate-gravel sandstone-fine sandstone-dolomite assemblages. They are both in angular unconformity contact with the underlying Paleoproterozoic Huanglianghe Formation rocks and the overlying Neoproterozoic Nantuo Formation rocks, with detailed chronological deposited age of ~ 1800-1500 Ma, the earliest Mesoproterozoic sedimentary records in the Yangtze Craton nucleus, which can be considered similar with the bottom to lower part of the Shennongjia Group(there is no outcrop in direct contact between the two layers). The Shennongjia Group rocks include algal reef dolomite, micritic dolomite, siltstone, conglomerate, fine sandstone, mudstone and volcanic rock, which are in angular unconformity contact with overlying the Macaoyuan Formation with invisible bottom, and deposited between ~1.4-1.0 Ga. The Macaoyuan Formation rocks, angular unconformable between Shennongjia Group and Nantuo Formation rocks, are a set of dolomitic or sandy cemented diamictite and dolomitic conglomerate. The Nantuo Formation rocks, combination of diamictite and gravel silty mudstone and carbonaceous mudstone, are formed between ~657-635 Ma and by Marinoan Glaciation. The Doushantuo and Dengying formations are the first stable carbonate rocks on the basement of the Yangtze craton, with sedimentary time of ~635-541 Ma, which are also the crucial evolution period for early life.
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[1] 陈公信,金经炜,吴细松. 1996.湖北省岩石地层[M]. 武汉:中国地质大学出版社,50-52．
[2] 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[J].地质通报, 32(4):631-638.
[3] 耿元生,陆松年. 2014.中国前寒武纪地层年代学研究的进展和相关问题[J].地学前缘, 21(2):102-118.
[4] 胡 蓉,李双庆,王 伟,陈福坤.2016.扬子北部三峡地区南沱组冰碛岩的物源特征:锆石年龄和地球化学证据[J].地球科学, 41(10):1630-1654.
[5] 胡正祥,刘早学,张焱林,毛新武,冉瑞生,廖宗明,刘成新. 2012.扬子地块北缘前南华纪神农架群底界的厘定及其地质意义[J].资源环境与工程, 26(3):201-208.
[6] 湖北省地质矿产局.1990.湖北省区域地质志[M].北京: 地质出版社, 5-43．
[7] 旷红伟,耿元生,柳永清,王玉冲,夏晓旭,彭 楠,范正秀,陈骁帅,白华青. 2019.扬子克拉通北缘“神农架群底界”的再厘定及其地层学意义[J]．地质学报, 93(1):72-93.
[8] 李 铨,冷 坚. 1987.前寒武纪地质研究－神农架上前寒武系[M].天津:天津科学技术出版社, 1-503.
[9] 李福喜,聂学武,胡正祥,袁祚兴.1989.试论黄陵断隆北缘中、下元古界的不整合关系[J]．湖北地质, 3(1)：43-56.
[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[J].岩石学报, 29(2):673-697.
[11] 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[J].资源环境与工程, 18(增刊) : 5-16.
[12] 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[J].资源环境与工程, 27(3):328-334.
[13] 全国地层委员会. 2017.中国地层指南及中国地层指南说明书(2016)[M].北京:地质出版社, 1-62.
[14] 肖志斌. 2012.中元古代扬子北缘神农架地区沉积岩碎屑锆石研究[D].西北大学硕士学位论文, 1-64.
[15] 熊成云,韦昌山,金光富,谭文清,李文羡. 2004.鄂西黄陵背斜地区前南华纪古构造格架及主要地质事件[J].地质力学学报,10(2):97-112.
[16] 徐大良,刘 浩,魏运许,彭练红,邓 新.2016.扬子北缘神农架地区郑家垭组碎屑锆石年代学及其构造意义[J].地质学报, 90(10):2648-2660.
[17] 杨刚忠,宋银桥,聂开红,李福喜,罗 洪,廖忠明. 2010.宜昌磷矿田成矿地质特征及深部找矿模式探析[J].矿物岩石, 30(2):50-59.
[18] 叶 琴,童金南,安志辉,田 力,赵小明,朱士兴. 2015. 湖北宜昌樟村坪埃迪卡拉纪陡山沱组磷酸盐化微体化石组合[J].古生物学报, 54(1):43-65.
[19] 赵小明,安志辉,邱啸飞,吴年文,魏运许,胡 昆,赵雨溪. 2018.扬子陆核北崆岭地区“马槽园群”的新认识[J]．地球科学, 43(9): 3324~3336．
[20] 周传明,解古巍,肖书海. 2005.湖北宜昌樟村坪陡山沱组微体化石新资料[J].微体古生物学报, 22(3): 217-224.
[21] An Z H, Jiang G Q, Tong J N, Tian L, Ye Q, Song H Y, Song H J. 2015. Stratigraphic position of the Ediacaran Miaohe biota and its constrains on the age of the upper Doushantuo 13C anomaly in the Yangtze Gorges area, South China[J]. Precambrian Research, 271 :243-253.
[22] Condon D, Zhu M Y, Bowring S, Wang W, Yang A H, Jin Y G. 2005. U-Pb Ages from the Neoproterozoic Doushantuo Formation, China[J]. Science, 308(5718):95- 98.
[23] Hu J, Li C, Tong J N, Ye Q, Tian L, An Z H, Dodd M S, Algeo T J. 2020. Glacial origin of the Cryogenian Nantuo Formation in eastern Shennongjia area (South China): Implications for macroalgal survival[J]. Precambrian Research, 351, 105969.
[24] Liu P J, Yin C Y, Chen S M, Tang F, Gao L Z. 2013. The biostratigraphic succession of acanthomorphic acritarchs of the Ediacaran Doushantuo Formation in the Yangtze Gorges area, South China and its biostratigraphic correlation with Australia[J]. Precambrian Research, 225:29-43.
[25] Liu X M, Ling W L, Gao S. 2010. Proterozoic crustal evolution of Yangtze Craton revealed by detrital zircons from Shenlongjia area, South China[J]. Abstract, 20th Goldschmidt Conference, A621.
[26] Qiu X F, Ling W L, Liu X M, Kusky T, Berkana W, Zhang Y H, Gao YJ, 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[J]. Precambrian Research, 2011,191(3):101~119.
[27] Tian L, Song H Y, Ye Q, Hu J, An Z H, Zhao X M, David B, Tong J N. 2020. Recurrent anoxia recorded in shallow marine facies at Zhangcunping (western Hubei, China) throughout the Ediacaran to earliest Cambrian[J]. Precambrian Research, 340:105617.
[28] 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[J]. Precambrian Research, 235:58-70.
[29] Wei Y X, Ma C Q, Xu D L, Zhao X M, Peng L H, Deng X, Liu H. 2016. Zircon SHRIMP U-Pb Geochronology of the Volcanic Rocks from the Paleoproterozoic Huanglianghe Formation in the Yangtze Craton and its Geological Significance [J]. Geology and Mineral Resources of South China, 32(3):297.
[30] Ye Q, Tong J N, An Z H, Hu J, Tian L, Guan K P Xiao S H. 2019. A systematic description of new macrofossil material from the upper Ediacaran Miaohe Member in South China[J]. J. Syst. Paleontol, 17 (3):183-238.
[31] Ye Q, Tong J N, Xiao S H, Zhu S X, An Z H, Tian L, Hu J. 2015. The survival of benthic macroscopic phototrophs on a Neoproterozoic Snowball Earth[J]. Geology, 43(6):507-510.
[32] Zhao X M, Qiu X F, An Z H,Wu N W, Tian L, Wei Y X, Jiang T. 2019. Redefinition of Early Mesoproterozoic (1800-1600 Ma) stratigraphy in the northern Kongling area, China: The nucleus of Yangtze Craton and its tectonic significance [J]. China Geology, 2(2):157-168.
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