Sedimentary characteristics of the Cryogenian Nantuo Formation and stratigraphic attribution of red beds in central Yunnan, southwestern margin of Yangtze Craton
QI Kening1,2, KUANG Hongwei1, LIU Yongqing1, PENG Nan1, WANG Yuchong1,3, CHEN Xiaoshuai1
1 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China; 2 School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China; 3 College of Geosciences and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China
Abstract：In the central Yunnan region of the Yangtze Craton,the “red beds” that develop in the transitional section between the Nantuo Formation and the Doushantuo Formation of the Neoproterozoic,are still debated among scholars. This study carried out detailed stratigraphic and sedimentological studies on the Nantuo Formation in the Lunacun and Feidatian sections in the central Yunnan region. The sections were located on the southwestern margin of the Yangtze craton. The conglomerate member and its overlying red mudstone member of the Nantuo Formation exhibit typical glacial sedimentary features such as striae,dropstone,and rhythmic laminae,base on which,four sedimentary subfacies can be divided,i.e.,subglacial lag,periglacial channel,pre-glacial delta front,and pre-glacial shoreline subfacies,reflecting different stages of glaciation. The youngest detrital zircon age at the top of the red mudstone is 636Ma,indicating that the deposition time of the top of the purple-red fine sandstone in the upper member of the Nantuo Formation may be later than 636Ma. The regional stratigraphic comparison reveals that the spatial distribution of the conglomerate and mudstone members of the Nantuo Formation in central Yunnan is stable;it represents accumulation of conglomerates under glacier ice,transitioning upwards to the conglomerates of periglacial river channels,and then upwards to the mudstones and fine sandstone of the pre-glacial delta front and the pre-glacial shoreline,exhibiting a pattern of gradual melting of glaciers and marine invasion. In summary,this study suggests that the Nantuo Formation should be divided into two parts,with the lower member consisting of conglomerate and the upper member consisting of purple-red mudstone. The boundary between the Nantuo Formation and the Doushantuo Formation should be placed at the top of the red layer. This study deepens the understanding of the Cryogenian palaeogeography,the southwestern margin of the Yangtze craton. It provides new sedimentological data for improving the isochronous stratigraphic framework from the Cryogenian to Ediacaran,and assists in deep oil and gas exploration in the Sichuan Basin and its surrounding areas.
基金资助:*国家自然科学基金(编号: 42072135)、中国地质调查局项目(编号: DD20221649)和北京科委国际创新资源合作项目(编号: Z201100008320007)共同资助; Co-funded by the National Natural Science Foundation of China(No.42072135),the China Geological Survey(No.DD20221649),and the Beijing Science and Technology Commission's International Innovation Resources Cooperation Project(No.Z201100008320007)
QI Kening,KUANG Hongwei,LIU Yongqing et al. Sedimentary characteristics of the Cryogenian Nantuo Formation and stratigraphic attribution of red beds in central Yunnan, southwestern margin of Yangtze Craton[J]. JOPC, 2024, 26(6): 1305-1324.
[1] 蔡耀平. 2011. 陕西宁强埃迪卡拉纪晚期高家山生物群中的Conotubus hemiannulatus及Gaojiashania cyclus: 化石埋藏学与古生态学研究. 西北大学博士学位论文: 20-108. [Cai Y P.2011. Taphonomy and paleoecology of Ediacaran tubular fossil Conotubus hemiannulatus and Gaojiashania cyclus from the Gaojiashan Lagerstaitte in southern Shaanxi Province,South China. Doctoral dissertation of Northwest University: 20-108] [2] 曹仁关,张为鹂,李季. 1985. 云南东部震旦系的划分与对比. 地层学杂志,(3): 170-179. [Cao R G,Zhang W L,Li J.1985. Classification and comparison of the Sinian System in Eastern Yunnan. Journal of Stratigraphy,(3): 170-179] [3] 陈建书,代雅然,唐烽,彭成龙,张嘉玮,朱和书,陈兴,王文明,龚桂源. 2020. 扬子地块周缘中元古代末—新元古代主要构造运动梳理与探讨. 地质论评, 66(3): 533-554. [Chen J S,Dai Y R,Tang F,Peng C L,Zhang J W,Zhu H S,Chen X,Wang W M,Gong G Y.2020. Discussion on the Mesoproterozoic and Neoproterozoic major tectonic events in marginal area of the Yangtze Block. Geological Review, 66(3): 533-554] [4] 崔晓庄,江新胜,王剑,卓皆文,熊国庆,陆俊泽,邓奇,伍皓,刘建辉. 2013. 滇中新元古代澄江组层型剖面锆石U-Pb年代学及其地质意义. 现代地质,27(3): 547-556. [Cui X Z,Jiang X S,Wang J,Zhuo J W,Xiong Q G,Lu J Z,Deng Q,Wu H,Liu J H.2013. Zircon U-Pb Geochronology for the stratotype section of the Neoproterozoic Chengjiang Formation in central Yunnan and its geological significance. Geoscinece,27(3): 547-556] [5] 崔晓庄,江新胜,王剑,卓皆文,伍皓,熊庆国,陆俊泽,邓奇,江卓斐. 2014. 滇中新元古代裂谷盆地充填序列及演化模式: 对Rodinia超大陆裂解的响应. 沉积学报, 32(3): 399-409. [Cui X Z,Jiang X S,Wang J,Zhuo J W,Wu H,Xiong Q G,Lu J Z,Deng Q,Jiang Z F.2014. Filling sequence and evolution model of the Neoproterozoic rift basin in central Yunnan Province,South China: response to the breakup of Rodinia Supercontinent. Aata Sedimentologica Sinica, 32(3): 399-409] [6] 房瑞森,梁悦,华洪,张志飞. 2021. 埃迪卡拉纪晚期疑难化石Shaanxilithes在云南会泽朱家箐剖面的首现及其意义. 古生物学报, 60(1): 25-41. [Fang R S,Liang Y,Hua H,Zhang Z F.2021. First report of the problematic Ediacaran fossil Shaanxilithes from the Jiucheng Member of Zhujiaqing Section in Huize,Yunnan Province. Acta Palaeontologica Sinica, 60(1): 25-41] [7] 高永娟,林仕良,秦雅东,任光明,庞维华,楼雄英. 2021. 扬子陆块西缘云南东川地区澄江组碎屑锆石U-Pb年龄、Hf同位素组成及其对物源和地壳演化的约束. 地质通报, 40(11): 1943-1956. [Gao Y J,Lin S L,Qin Y D,Ren G M,Pang W H,Lou X Y.2021. U-Pb age and Hf isotope composition of detrital zircons from the Chengjiang Formation in Dongchuan area,Yunnan Province of the western Yangtze Block and its constraints on provenanci and crustal evolution. Geological Bulletin of China, 40(11): 1943-1956] [8] 侯可军,李延河,田有荣. 2009. LA-MC-ICP-MS锆石微区原位U-Pb定年技术. 矿床地质, 28(4): 481-492. [Hou K J,Li Y H,Tian Y Y.2009. In situ U-Pb zircon dating using laser ablation-multi ion couting-ICP-MS. Mineral Deposits, 28(4): 481-492] [9] 江新胜,王剑,崔晓庄,卓皆文,熊庆国,陆俊泽,刘建辉. 2012. 滇中新元古代澄江组锆石SHRIMP U-Pb年代学研究及其地质意义. 中国科学: 地球科学, 42(10): 1496-1507. [Jiang X S,Wang J,Cui X Z,Zhuo J W,Xiong G Q,Lu J Z,Liu J H.2012. Zircon SHRIMP U-Po geochronology of the Neoproterozoic Chengjiang Formation in central Yunnan Province(SW China)and its geological significance. Science China Earth Sciences, 42(10): 1496-1507] [10] 江卓斐. 2016. 扬子西缘新元古代冰川启动时间、期次及其构造—岩相古地理演化. 中国地质大学(北京)博士学位论文: 1-168. [Jiang Z F.2016. Onset time and periods of the Neoproterozoic glaciers in western Yangtze Block and the tectonic-lithofacies palaeogeography. Doctoral dissertation of China University of Geosciences(Beijing): 1-168] [11] 江卓斐,崔晓庄,伍皓,卓皆文,王剑,熊庆国,陆俊泽,蔡娟娟. 2018. 滇东成冰纪南沱组碎屑锆石U-Pb年代学研究及其地质意义. 矿物岩石, 38(1): 42-54. [Jiang Z F,Cui X Z,Wu H,Zhuo J W,Wang J,Xiong G Q,Lu J Z,Cai J J.2018. Study of detrital zircon U-Pb age of the Crygenian Nantuo Formation in eastern Yunnan Province and its geological signifcance. Jounal of Mineral Petrology, 38(1): 42-54] [12] 旷红伟,柳永清,耿元生,彭楠,王玉冲,陈骁帅,刘燕学,杨锋杰,赵峰华,刘鹏举,杜利林,宋换新,王德海,王昌勇,白华青,东归霖,祁柯宁. 2023. 中国中一新元古代地层研究进展及建议划分,对比方案. 地质学报, 97(12): 3861-3901. [Kuang H W,Liu Y Q,Geng Y S,Peng N,Wang Y C,Chen X S,Liu Y X,Yang F J,Zhao F H,Liu P J,Du L L,Song H X,Wang D H,Wang C Y,Bai H Q,Dong G L,Qi K N.2023. Research advances,a subdivision and correlation of the Meso-Neoproterozoic stratigraphy in China. Acta Geologica Sinica, 97(12): 3861-3901] [13] 林尧明,田化鑫,伦志强. 1990. 云南省区域地质志. 全国地质资料馆: 5-43. [Lin Y M,Tian H X,Lun Z Q.1990. Regional Geological Records of Yunnan Province. National Geological Data Museum: 5-43] [14] 刘鸿允. 1991. 中国晚前寒武纪构造、古地理与沉积演化. 地质科学,(4): 309-316. [Liu H Y.1991. Tectonic,paleogeographic,and sedimentary evolution of the Late Precambrian in China. Cientia Geologica Sinica,(4): 309-316] [15] 刘鸿允,刘钰. 1963. 云南中东部震旦纪地层的组成、划分与发育. 地质学报, 43(1): 53-80. [Liu H Y,Liu Y.1963. Succession,classification,and paleogeographic evolution of the Sinian sediments of central eastern Yunnan. Acta Geologica Sinica, 43(1): 53-80] [16] 刘石磊,崔晓庄,汪长林,任光明,王鹏,彭维华,任飞. 2020. 扬子西缘新元古代中期裂谷作用: 来自年代学与沉积学的新证据. 地球科学, 45(8): 3082-3093. [Liu S L,Cui X Z,Wang C L,Ren G M,Wang P,Peng W H,Ren F.2020. New sedimentological and geochronological evidence for Mid-Neoproterozoic rifting in western Yangtze Block,South China. Earth Science, 45(8): 3082-3093] [17] 刘旭辉. 1998. 玉溪地区震旦系陡山沱组沉积相、地层层序及其控矿意义. 云南地质,(1): 89-93. [Liu X H.1998. The sedimentary facies,stratigraphic sequence of Sinian Doushantuo Formation in Yuxi region and their significance in controlling metallogenesis. Yunnan Geology,(1): 89-93] [18] 潘江涛,吴亮,余莉,李仕忠,胡关云. 2022. 滇东北待补地区碎屑锆石U-Pb年龄及其对新元古代康滇裂谷盆地沉积古地理演化的启示. 地质通报, 41(10): 1745-1756. [Pan J T,Wu L,Yu L,Li S Z,Hu G Y.2022. U-Pb ages of detrital zircons from Daibu area,northeastern Yunnan Province: the implication Neoproterozoic paleogeographic evolution of the Kangtian rift basin. Geological Bulletin of China, 41(10): 1745-1756] [19] 彭杰,谢渊,庞维华,任光明,崔晓庄,任飞,陈风霖,刘星宇. 2023. 扬子西缘新元古代裂谷盆地演化的年代学新证据及其意义. 沉积与特提斯地质, 43(2): 452-463. [Peng J,Xie Y,Pang W H,Ren G M,Cui X Z,Ren F,Chen F L,Liu X Y.2023. New zircon U-Pb chronology of the Neoproterozoic rift basin evolutionin the westerm Yangtze Block and its geological significance. Sedimentary Geology and Tethyan Geology, 43(2): 452-463] [20] 孙娇鹏,陈世悦,彭渊,胡忠亚,庄毓凯,马帅,刘姚. 2014. 全吉地区新元古代滨岸冰川沉积特征及地质意义. 地质学报,88(7): 1334-1340. [Sun J P,Chen S Y,Peng Y,Hu Z Y,Zhuang Y K,Ma S,Liu Y.2014. Sedimentary characteristic of Neoproterozoic glaciomarine in the Quanji area and its geological significance. Acta Geologica Sinica,88(7): 1334-1340] [21] 汪正江,王剑,江新胜,孙海清,高天山,陈建书,邱艳生,杜秋定,邓奇,杨菲. 2015. 华南扬子地区新元古代地层划分对比研究新进展. 地质论评, 61(1): 1-22. [Wang Z J,Wang J,Jiang X S,Sun H Q,Gao T S,Chen J S,Qiu Y S,Du Q D,Deng Q,Yang F.2015. New progress for the stratigraphic division and correlation of Neoproterozoic in Yangtze Block,South China. Geological Review, 61(1): 1-22] [22] 王宝琛. 1980. 昆明市晋宁王家湾震旦系剖面兼论云南东部震旦系的划分. 地质论评,(1): 1-6. [Wang B C.1980. The Sinian section of Wangjiawan,Jinning,Kunming City,with a discussion on the division of the Sinian system in eastern Yunnan. Geological Review,(1): 1-6] [23] 王剑. 2000. 华南新元古代裂谷盆地演化: 兼论与Rodinia解体的关系. 北京: 地质出版社,32-45. [Wang J.2000. Evolution of the Neoproterozoic Rift Basin in South China: A Discussion on Its Relationship with Rodinia Disaggregation. Beijing: Geological Publishing House,32-45] [24] 王曰伦,陆松年,高振家,林蔚兴,马国干. 1980. 中国震旦纪冰川特征、分期及对比. 中国地质科学院天津地质矿产研究所分刊, 1(1): 1-17. [Wang Y L,Lu S N,Gao Z J,Lin W X,Ma G G.1980. The features,divisoin and correlation of Sinian glacial deposits in China. Journal of Tianjin Institute of Geology and Mineral Resources,Chinese Academy of Geological Sciences, 1(1): 1-17] [25] 熊秉信. 1940. 昆明縣內古生代下部地層之初步研究. 地质论评,(Z1): 37-43. [Xiong B X.1940. Preliminary study on the Lower Paleozoic Strata in Kunming County. Geological Review,(Z1): 37-43] [26] 杨暹和,陈远德. 1981. 西南地区地层总结《震旦系》. 成都: 地质矿产部成都地质矿产研究所,18-36. [Yang X H,Chen Y D.1981. Summary of Stratigraphy in Southwest China,Sinian Series. Chengdu: Chengdu Institute of Geology and Mineral Resources. Chengdu: Ministry of Geology and Mineral Resources,18-36] [27] 张长俊. 1990. 云南南沱组杂砾岩的成因及沉积相. 成都地质学院学报,17(4): 53-60,138. [Zhang C J.1990. Seimemtary facies and origin of purplish red diamicties of the Nantuo Formation(Lower Sinian)in Yunnan. Journal of Chengdu Colloge of Geology,17(4): 53-60,138] [28] 张志亮,华洪,张志飞. 2015. 埃迪卡拉纪疑难化石Shaanxilithes在云南王家湾剖面的发现及地层意义. 古生物学报, 54(1): 12-28. [Zhang Z L,Hua H,Zhang Z F.2015. Problemtic Ediacaran fossil Shaanxilithes from the Jiucheng member of Wangjiawan section in Jinning,Yunnan Province. Acta Palaeontologica Sinica, 54(1): 12-28] [29] 郑本兴,马正海. 1985. 冰川沉积与非冰川沉积中砾石和碎屑矿物表面的形态特征. 第四纪研究,(1): 69-72. [Zheng B X,Ma Z H.1985. Surface morphological characteristics of the gravels and the debris minerals in glacial and non-glacial deposits. Quaternary Sciences,(1): 69-72] [30] 周传明,袁训来,肖书海,陈哲,华洪. 2019. 中国埃迪卡拉纪综合地层和时间框架. 中国科学: 地球科学,49(1): 7-25. [Zhou C M, Yuan X,Xiao S H,Chen Z,Hua H.2019. Ediacaran integrative stratigraphy and timescale of China. Science China Earth Sciences,49(1): 7-25] [31] 周传明,欧阳晴,王伟,万斌,关成国,陈哲,袁训来. 2021. 中国埃迪卡拉纪岩石地层划分和对比. 地层学杂志, 45(3): 211-221. [Zhou C M,Ouyang Q,Wang W,Wan B,Guan C G,Chen Z,Yuan X L.2021. Lithostratigraphic subdivision and correlation of the Ediacaran in China. Journal of Stratigraphy, 45(3): 211-221] [32] 朱茂炎,李国祥,张俊明,M Steiner,钱逸,蒋志文. 2001. 云南东部早寒武世地层学. 古生物学报,40(增刊): 4-39. [Zhu M Y,Li G X,Zhang J M, Steiner M,Qian Y,Jiang Z W.2001. Early Cambrian stratigraphy in eastern Yunnan. Acta Palaeontologica Sinica,40(S): 4-39] [33] 朱茂炎,赵方臣,殷宗军,曾晗,李国祥. 2019. 中国的寒武纪大爆发研究: 进展与展望. 中国科学: 地球科学, 49(10): 1455-1490. [Zhu M Y,Zhao F C,Yin Z J,Zeng H, Li G X.2019. The Cambrian explosion: advances and perspectives from China. Science China Earth Scienes, 49(10): 1455-1490] [34] 朱筱敏. 2008. 沉积岩石学. 北京: 石油工业出版社,80-87. [Zhu X M.2008. Sedimentary Petrology. Beijing: Petroleum Industry Press,80-87] [35] Bai H Q,Kuang H W,Liu Y Q,Peng N,Chen X S,Wang Y C.2020. Marinoan-aged red beds at Shennongjia,South China: evidence againstglobal-scale glaciation during the Cryogenian. Palaeogeography,Palaeoclimatology,Palaeoecology,559: 109967. [36] 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. Science, 308: 95-98. [37] Condon D J,Prave A R,Benn D I.2002. Neoproterozoic glacial-rainout intervals: observations and implications.Geology, 30(1): 35-38. [38] Eyles N.1993. Earth’s glacial record and its tectonic setting. Earth-Science Reviews,35(i1-2): 1-248. [39] Fairchild I J,Bonnand P,Davies T,Fleming E J,Grassineau N,Halverson G P,Hambrey M J,McMillan E M,McKay E,Parkinson I J,Stevenson C T E.2016. The Late Cryogenian warm interval,NE Svalbard: chemostratigraphy and genesis. Precambrian Research, 281: 128-154. [40] Gehrels G E,Dickinson W R,Ross G M,Ross G M,Stewart J H,Howell D G.1995. Detrital zircon reference for Cambrian to Triassic miogeoclinal strata of western North America.Geology, 23(9): 831-834. [41] Hoffman P F, Schrag D P.2002. The snowball Earth hypothesis: testing the limits of global change.Terra Nova, 14: 129-155. [42] Hoffman P F,Li Z X.2009. A palaeogeographic context for Neoproterozoic glaciation. Palaeogeography, Palaeoclimatology, Palaeoecology, 277(3-4): 158-172. [43] Hoffman P F,Kaufman A J,Halverson G P,Schrag D P.1998. A Neoproterozoic Snowball Earth. Science, 281: 1342-1346. [44] Kennedy M J,Runneger B,Prave A R,Hoffmann K H,Arthur M A.1997. Two or four Neoproterozoic glaciations? Geology, 26: 1059-1063. [45] Hoffman K H,Condon D J,Bowring S A,Crowley J L.2004. U-Pb zircon date from the Neoproterozoic Ghaub Formation,Namibia: constraints on Marinoan glaciation. Geology,32(9): 817-820. [46] Kuang H W,Liu Y Q,Peng N,Vandyk T M,Le Heron D P,Zhu Z C,Bai H Q,Wang Y C,Wang Z X,Zhong Q,Chen J X,Yu H L,Chen X S,Song C G,Qi K N.2022. Ediacaran cap dolomite of Shennongjia,northern Yangtze Craton,South China. Precambrian Research, 368: 106483. [47] Le Heron D P,Craig J,Etienne J L.2009. Ancient glaciations and hydrocarbon accumulations in North Africa and the Middle East. Earth-Science Reviews, 93: 47-76. [48] Li S Z,Li X Y,Wang G Z,Liu Y M,Wang Z C,Wang T S,Gao X Z,Guo X Y,Somerville I,Li Y,Zhou J,Dai L M,Jiang S H,Zhao H,Wang Y,Wang G,Yu S.2019. Global Meso-Neoproterozoic plate reconstruction and formation mechanism for Precambrian basins: constraints from three cratons in China. Earth-Science Reviews, 198: 102946. [49] Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q,Wang D B.2010. Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen: U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths. Journal of Petrology, 51: 537-571. [50] Misch P.1942. Sinian stratigraphy of central eastern Yunnan. National University of Peking, College of Science. Contributions,No.4. [51] Prothero D R,Schwab F L.2013. Sedimentary Geology: An Introduction to Sedimentary Rocks and Stratigraphy. NewYork: W. H. Freeman and Company, 160-168. [52] Sláma J,Kosler J,Condon D J,Crowley J L,Gerdes A,Hanchar J M,Horstwood M S A,Morris G A,Nasdala L,Norberg N,Schaltegger U,Schoene B,Tubrett M N, Whitehouse M J.2008. Plesovice zircon: a new natural reference material for U-Pb and Hf isotopic microanalysis. Chemical Geology, 249: 1-35. [53] Steiner M.1994. Die Neoproterozoischen Megaalgen Sud Chinas. Berliner Geowissenschaftliche Abhandlungen(E). Selbstverlag Fachbereich Geowissenschaften,FU Berlin Druck: 1-146. [54] Sun W H,Zhou M F,Gao J F, Yang Y H,Zhao X F,Zhao J H.2009. Detrital zircon U-Pb geochronological and Lu-Hf isotopic constraints on the Precambrian magmatic and crustal evolution of the western Yangtze Block,SW China. Precambrian Research, 172(1-2): 99-126. [55] Wang H,Wu W H,Liu S G,Zhang X H,Song J M,Li S J,Ran B,Wang Z J,Han Y Y,Wang W D,Wang Z,Li Z W.2020. Initial separation of the South Qinling Terrane from the Yangtze Block during the Ediacaran: insights from sequence correlation and zircon Hf isotope of tuff. Marine and Petroleum Geology, 122: 104613. [56] Wang J,Li Z X.2001. Sequence stratigraphy and evolution of the Neoproterozoic marginal basins along southeastern Yangtze,south China. Gondwana Research, 4(1): 17-26. [57] Xiao S H,Bao H M,Wang H F,Kaufman A J,Zhou C M,Li G X,Yuan X L,Ling H F.2004. The Neoproterozoic Quruqtagh Group in eastern Chinese Tianshan: evidence for a post-Marinoan glaciation. Precambrian Research,130: 1-26. [58] Xing L C,Luo T Y,Huang Z L,Qian Z K,Zhou M Z,He H T.2018. U-Pb zircon age of the base of the Ediacaran System at the southern margin of the Qinling Orogen. Acta Geochimica, 37(3): 414-421. [59] Yang C,Li X H,Zhu M Y,Condon D J.2017. SIMS U-Pb zircon geochronological constraints on upper Ediacaran stratigraphic correlations,South China. Geological Magazine, 154(6): 1202-1216. [60] Yang C,Li X H,Li Z X,Zhu M Y,Lu K.2020. Provenance evolution of age calibrated strata reveals when and how South China Block collided with Gondwana. Geophysical Research Letters, 47(19): e2020GL090282,1-9. [61] Yin C Y,Tang F,Liu Y Q,Gao L Z,Liu P J,Xing Y S,Yang Z Q,Wan Y S,Wang Z Q.2005. U-Pb zircon age from the base ofthe Ediacaran Doushantuo Formation in the Yangtze Gorges,South China: constraint on the age of Marinoan glaciation. Episodes, 28(1): 48-49. [62] Zhang S H,Jiang G Q,Zhang J M,Song B,Kennedy M J,Christie-Blick N.2005. U-Pb sensitive high-resolution ion microprobe ages from the Doushantuo Formation in south China: constraints on late Neoproterozoic glaciations. Geology, 33(6): 473-476. [63] Zhao G C,Guo J H.2012. Precambrian geology of China. Precambrian Research, 222-223: 1-12. [64] Zhou C M,Huyskens M H,Lang X G,Xiao S H,Yin Q Z.2019. Calibrating the terminaions of Cryogenian global glaciations. Geology, 251: 251-254. [65] Zhou M F,Yan D P,Kennedy A K,Li Y Q,Ding J.2002. SHRIMP U-Pb zircon geochronological and geochemical evidence for Neoproterozoic arc-magmatism along the western margin of the Yangtze Block,South China. Earth and Planetary Science Letters, 196: 51-67. [66] Zhu M Y,Zhang J M,Yang A H.2007. Integrated Ediacaran(Sinian)chronostratigraphy of South China. Palaeogeography,Palaeoclimatology,Palaeoecology, 254(1): 7-61.
