Constraints on the Ediacaran-Cambrian boundary in deep-water realm in South China: Evidence from zircon CA-ID-TIMS U-Pb ages from the topmost Liuchapo Formation

Amthor J E, Grotzinger J P, Schroder S, Bowring S A, Ramezani J, Martin M W, Matter A. 2003. Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman. Geology, 31: 431–434 Bowring S A, Grotzinger J P, Condon D J, Ramezani J, Newall M J, Allen P A. 2007. Geochronologic constraints on the chronostratigraphic framework of the Neoproterozoic Huqf Supergroup, Sultanate of Oman. Am JSci, 307: 1097–1145 Brasier M D, Corfield R M, Deny L A, Rozanov A Y, Zhuravlev A Y. 1994. Multiple δ C excursions spanning the Cambrian explosion to the Botomian crisis in Siberia. Geology, 22: 455–458 Buatois L A. 2018. Treptichnus pedum and the Ediacaran-Cambrian boundary: Significance and caveats. Geol Mag, 155: 174–180 Canfield D E, Poulton S W, Knoll A H, Narbonne G M, Ross G, Goldberg T, Strauss H. 2008. Ferruginous conditions dominated later Neoproterozoic deep-water chemistry. Science, 321: 949–952 Cawood P A, Wang Y, Xu Y, Zhao G. 2013. Locating South China in Rodinia and Gondwana: A fragment of greater India lithosphere? Geology, 41: 903–906 Chen D, Wang J, Qing H, Yan D, Li R. 2009. Hydrothermal venting activities in the Early Cambrian, South China: Petrological, geochrono-logical and stable isotopic constraints. Chem Geol, 258: 168–181 Chen D, Zhou X, Fu Y, Wang J, Yan D. 2015. New U-Pb zircon ages of the Ediacaran-Cambrian boundary strata in South China. Terra Nova, 27: 62–68 Chen X, Ling H F, Vance D, Shields-Zhou G A, Zhu M, Poulton S W, Och L M, Jiang S Y, Li D, Cremonese L, Archer C. 2015. Rise to modern levels of ocean oxygenation coincided with the Cambrian radiation of animals. Nat Commun, 6: 7142 Chu Z Y, Xu J J, Chen Z, Li C F, He H Y, Li X H, Guo J H. 2016. Ultra-low blank analytical procedure for high precision CA-ID-TIMS U-Pb dating of single grain zircons (in Chinese). Chin Sci Bull, 61: 1121–1129 Condon D J, Schoene B, McLean N M, Bowring S A, Parrish R R. 2015. Metrology and traceability of U-Pb isotope dilution geochronology (EARTHTIME Tracer Calibration Part I). Geochim Cosmochim Acta, 164: 464–480 Erwin D H, Laflamme M, Tweedt S M, Sperling E A, Pisani D, Peterson K J. 2011. The Cambrian conundrum: Early divergence and later ecological success in the early history of animals. Science, 334: 1091–1097 Feng L, Zhang Q. 2016. The Pre-Sturtian negative S C excursion of the Dajiangbian formation deposited on the western margin of Cathaysia Block in south China. J Earth Sci, 27: 225–232 Gehling J G, Jensen S, Droser M L, Myrow P M, Narbonne G M. 2001. Burrowing below the basal Cambrian GSSP, fortune head, Newfoundland. Geol Mag, 138: 213–218 Gerstenberger H, Haase G. 1997. A highly effective emitter substance for mass spectrometric Pb isotope ratio determinations. Chem Geol, 136: 309–312 Geyer G, Landing E. 2016. The Precambrian-Phanerozoic and Ediacaran-Cambrian boundaries: A historical approach to a dilemma. Geol Soc Lond Spec Publ, 448: 311–349 Goldberg T, Strauss H, Guo Q, Liu C. 2007. Reconstructing marine redox conditions for the Early Cambrian Yangtze Platform: Evidence from biogenic sulphur and organic carbon isotopes. Palaeogeogr Palaeocli-matol Palaeoecol, 254: 175–193 Grotzinger J P, Bowring S A, Saylor B Z, Kaufman A J. 1995. Biostrati-graphic and geochronologic constraints on early animal evolution. Science, 270: 598–604 Guo Q J, Strauss H, Zhu M Y, Zhang J M, Yang X L, Lu M, Zhao F C. 2013. High resolution organic carbon isotope stratigraphy from a slope to basinal setting on the Yangtze Platform, South China: Implications for the Ediacaran-Cambrian transition. Precambrian Res, 225: 209–217 Guo Q J, Strauss H, Liu C Q, Goldberg T, Zhu M, Pi D, Heubeck C, Vernhet E, Yang X, Fu P. 2007. Carbon isotopic evolution of the terminal Neoproterozoic and early Cambrian: Evidence from the Yangtze Platform, South China. Palaeogeogr Palaeoclimatol Palaeoecol, 254: 140–157 Ireland T R, Williams I S. 2003. Considerations in zircon geochronology by SIMS. Rev Mineral Geochem, 53: 215–241 Ishikawa T, Ueno Y, Komiya T, Sawaki Y, Han J, Shu D, Li Y, Maruyama S, Yoshida N. 2008. Carbon isotope chemostratigraphy of a Pre-cambrian/Cambrian boundary section in the Three Gorge area, South China: Prominent global-scale isotope excursions just before the Cambrian explosion. Gondwana Res, 14: 193–208 Jaffey A H, Flynn K F, Glendenin L E, Bentley W C, Essling A M. 1971. Precision measurement of half-lives and specific activities of U and 238U. Phys Rev C, 4: 1889–1906 Jensen S, Runnegar B N. 2005. A complex trace fossil from the Spitskop Member (terminal Ediacaran-Lower Cambrian) of southern Namibia. Geol Mag, 142: 561–569 Jensen S, Saylor B Z, Gehling J G, Germs G J B. 2000. Complex trace fossils from the terminal Proterozoic of Namibia. Geology, 28: 143–146 Jiang S Y, Pi D H, Heubeck C, Frimmel H, Liu Y P, Deng H L, Ling H F, Yang J H. 2009. Early Cambrian ocean anoxia in South China. Nature, 459: E5–E6 Jiang S Y, Yang J H, Ling H F, Chen Y Q, Feng H Z, Zhao K D, Ni P. 2007. Extreme enrichment of polymetallic Ni-Mo-PGE-Au in Lower Cambrian black shales of South China: An Os isotope and PGE geo-chemical investigation. Palaeogeogr Palaeoclimatol Palaeoecol, 254: 217–228 Kaufman A, Knoll A. 1995. Neoproterozoic variations in the C-isotopic composition of seawater: Stratigraphic and biogeochemical implications. Precambrian Res, 73: 27–49 Khomentovsky V V, Karlova G A. 2005. The Tommotian Stage base as the Cambrian Lower Boundary in Siberia. Stratigr Geol Correl, 13: 21–34 Kimura H, Matsumoto R, Kakuwa Y, Hamdi B, Zibaseresht H. 1997. The Vendian-Cambrian S C record, North Iran: Evidence for overturning of the ocean before the Cambrian Explosion. Earth Planet Sci Lett, 147: E1–E7 Kouchinsky A, Bengtson S, Pavlov V, Runnegar B, Torssander P, Young E, Ziegler K. 2007. Carbon isotope stratigraphy of the Precambrian-Cambrian Sukharikha River section, northwestern Siberian platform. Geol Mag, 144: 609–618 Lan Z, Li X H, Chu X, Tang G, Yang S, Yang H, Liu H, Jiang T, Wang T. 2017. SIMS U-Pb zircon ages and Ni-Mo-PGE geochemistry of the lower Cambrian Niutitang Formation in South China: Constraints on Ni-Mo-PGE mineralization and stratigraphic correlations. J Asian Earth Sci, 137: 141–162 Landing E. 1994. Precambrian-Cambrian boundary global stratotype ratified and a new perspective of Cambrian time. Geology, 22: 179–182 Landing E, Geyer G, Brasier M D, Bowring S A. 2013. Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy-Overcoming deficiencies of the first appearance datum (FAD) concept. Earth-Sci Rev, 123: 133–172 Lehmann B, Nagler T F, Holland H D, Wille M, Mao J, Pan J, Ma D, Dulski P. 2007. Highly metalliferous carbonaceous shale and Early Cambrian seawater. Geology, 35: 403–406 Li D, Ling H F, Shields-Zhou G A, Chen X, Cremonese L, Och L, Thirlwall M, Manning C J. 2013. Carbon and strontium isotope evolution of seawater across the Ediacaran-Cambrian transition: Evidence from the Xiaotan section, NE Yunnan, South China. Precambrian Res, 225: 128–147 Li D, Ling H F, Jiang S Y, Pan J Y, Chen Y Q, Cai Y F, Feng H Z. 2009. New carbon isotope stratigraphy of the Ediacaran-Cambrian boundary interval from SW China: Implications for global correlation. Geol Mag, 146: 465–484 Li D, Zhang X, Hu D, Li D, Zhang G, Zhang X, Ling H F, Xu Y, Shen Y. 2019. Multiple S-isotopic constraints on paleo-redox and sulfate concentrations across the Ediacaran-Cambrian transition in South China. Precambrian Res, 105500 Li Z X, Bogdanova S V, Collins A S, Davidson A, De Waele B, Ernst R E, Fitzsimons I C W, Fuck R A, Gladkochub D P, Jacobs J, Karlstrom K E, Lu S, Natapov L M, Pease V, Pisarevsky S A, Thrane K, Verni-kovsky V. 2008. Assembly, configuration, and break-up history of Rodinia: A synthesis. Precambrian Res, 160: 179–210 Linnemann U, Ovtcharova M, Schaltegger U, Gartner A, Hautmann M, Geyer G, Vickers-Rich P, Rich T, Plessen B, Hofmann M, Zieger J, Krause R, Kriesfeld L, Smith J. 2019. New high-resolution age data from the Ediacaran-Cambrian boundary indicate rapid, ecologically driven onset of the Cambrian explosion. Terra Nova, 31: 49–58 Macdonald F A, Pruss S B, Strauss J V. 2014. Trace fossils with spreiten from the Late Ediacaran Nama Group, Namibia: Complex feeding patterns five million years before the Precambrian Cambrian boundary. J Paleontol, 88: 299–308 Magaritz M, Holser W T, Kirschvink J L. 1986. Carbon-isotope events across the Precambrian/Cambrian boundary on the Siberian Platform. Nature, 320: 258–259 Magaritz M, Kirschvink J L, Latham A J, Zhuravlev A Y, Rozanov A Y. 1991. Precambrian/Cambrian boundary problem: Carbon isotope correlations for Vendian and Tommotian time between Siberia and Morocco. Geology, 19: 847–850 Maloof A C, Porter S M, Moore J L, Dudas F O, Bowring S A, Higgins J A, Fike D A, Eddy M P. 2010. The earliest Cambrian record of animals and ocean geochemical change. Geol Soc Am Bull, 122: 1731–1774 Mao J, Lehmann B, Du A, Zhang G, Ma D, Wang Y, Zeng M, Kerrich R. 2002. Re-Os dating of polymetallic Ni-Mo-PGE-Au mineralization in lower Cambrian black shales of South China and its geologic significance. Econ Geol, 97: 1051–1061 Martinson J M. 2005. Zircon U-Pb chemical abrasion (‘CA-TIMS’) method: Combined annealing and multi-step partial dissolution analysis for improved precision and accuracy of zircon ages. Chem Geol, 220: 47–66 Qian Y, Zhu M Y, He T G, Jiang Z W. 1996. New investigation of Precambrian- Cambrian boundary sections in eastern Yunnan (in Chinese with English abstract). Acta Micropal Sin, 13: 225–240 Qian Y, Zhu M Y, Li G X, Jiang Z W, Van Iten H. 2002. A supplemental Precambrian-Cambrian boundary global stratotype section in SW China. Acta Palaeontol Sin, 41: 19–26 von Quadt A, Wotzlaw J F, Buret Y, Large S J E, Peytcheva I, Trinquier A. 2016. High-precision zircon U/Pb geochronology by ID-TIMS using new 1013 ohm resistors. J Anal At Spectrom, 31: 658–665 Rogov V I, Karlova G A, Marusin V V, Kochnev B B, Nagovitsin K E, Grazhdankin D V. 2015. Duration of the first biozone in the Siberian hypostratotype of the Vendian. Rus Geol Geophys, 56: 573–583 Rozanov A Y, Khomentovsky V V, Shabanov Y Y, Karlova G A, Varlamov A I, Luchinina V A, Pegel’ T V, Demidenko Y E, Parkhaev P Y, Korovnikov I V, Skorlotova N A. 2010. To the problem of stage subdivision of the Lower Cambrian. Stratigr Geol Correl, 16: 1–19 Schmitz M D. 2012. Radiogenic isotope geochronology. In: Gradstein F M, Ogg J G, Schmitz M D, Ogg G M, eds. The Geologic Time Scale 2012, vol. 2. Amsterdam: Elsevier BV. 115–126 Shen Y, Schidlowski M. 2000. New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations. Geology, 28: 623–626 Shields-Zhou G, Zhu M. 2013. Biogeochemical changes across the Ediacaran-Cambrian transition in South China. Precambrian Res, 225: 1–6 Smith E F, Macdonald F A, Petach T A, Bold U, Schrag D P. 2016b. Integrated stratigraphic, geochemical, and paleontological late Ediacaran to early Cambrian records from southwestern Mongolia. Geol Soc Am Bull, 128: 442–468 Smith E F, Nelson L L, Strange M A, Eyster A E, Rowland S M, Schrag D P, Macdonald F A. 2016a. The end of the Ediacaran: Two new exceptionally preserved body fossil assemblages from Mount Dunfee, Nevada, USA. Geology, 44: 911–914 Stein R. 1990. Organic carbon content/sedimentation rate relationship and its paleoenvironmental significance for marine sediments. Geo-Mar Lett, 10: 37–44 Wang D, Ling H F, Struck U, Zhu X K, Zhu M, He T, Yang B, Gamper A, Shields G A. 2018. Coupling of ocean redox and animal evolution during the Ediacaran-Cambrian transition. Nat Commun, 9: 2575 Wang J, Chen D, Yan D, Wei H, Xiang L. 2012. Evolution from an anoxic to oxic deep ocean during the Ediacaran-Cambrian transition and implications for bioradiation. Chem Geol, 306–307: 129–138 Wang X Q, Shi X Y, Jiang G Q, Tang D J. 2014. Organic carbon isotope gradient and ocean stratification across the late Ediacaran-Early Cambrian Yangtze Platform. Sci China Earth Sci, 57: 919–929 Wei G Y, Planavsky N J, Tarhan L G, Chen X, Wei W, Li D, Ling H F. 2018. Marine redox fluctuation as a potential trigger for the Cambrian explosion. Geology, 46: 587–590 Wille M, Nagler T F, Lehmann B, Schroder S, Kramers J D. 2008. Hydrogen sulphide release to surface waters at the Precambrian/Cambrian boundary. Nature, 453: 767–769 Wille M, Nagler T F, Lehmann B, Schroder S, Kramers J D. 2009. Wille et al. reply. Nature, 459: E6 Wood R A, Poulton S W, Prave A R, Hoffmann K H, Clarkson M O, Guilbaud R, Lyne J W, Tostevin R, Bowyer F, Penny A M, Curtis A, Kasemann S A. 2015. Dynamic redox conditions control late Ediacaran metazoan ecosystems in the Nama Group, Namibia. Precambrian Res, 261: 252–271 Yang C, Zhu M, Condon D J, Li X H. 2017. Geochronological constraints on stratigraphic correlation and oceanic oxygenation in Ediacaran-Cambrian transition in South China. J Asian Earth Sci, 140: 75–81 Yang Y N, Li Q L, Liu Y, Tang G Q, Ling X X, Li X H. 2014. Zircon U-Pb dating by Secondary Ion Mass Spectrometry (in Chinese with English abstract). Earth Sci Front, 21: 81–92 Yao W H, Li Z X, Li W X, Li X H, Yang J H. 2014. From Rodinia to Gondwanaland: A tale of detrital zircon provenance analyses from the southern Nanhua Basin, South China. Am J Sci, 314: 278–313 Zhamoida A I. 2015. General stratigraphic scale of Russia: State of the art and problems. Rus Geol Geophys, 56: 511–523 Zhang J M, Li G X, Zhou C M, Zhu M Y, Yu Z Y 1997. Carbon isotope profiles and their correlation across the Neoproterozoic-Cambrian boundary interval on the Yangtze Platform, China. Bull Natl Mus Nat Sci, 10: 107–116 Zhang W T, Zhu Z L. 1979. Notes on some trilobites from the Lower Cambrian Houjiashan Formation in southern and southwestern parts of North China (in Chinese with English abstract). Acta Palaeontol Sin, 18: 513–525 Zhou C, Yuan X, Xiao S, Chen Z, Hua H. 2019. Ediacaran integrative stratigraphy and timescale of China. Sci China Earth Sci, 62: 7–24 Zhou M, Luo T, Huff W D, Yang Z, Zhou G, Gan T, Yang H, Zhang D. 2018. Timing the termination of the Doushantuo negative carbon isotope excursion: Evidence from U-Pb ages from the Dengying and Liuchapo formations, South China. Sci Bull, 63: 1431–1438 Zhou M Z, Luo T Y, Liu S R, Qian Z K, Xing L C. 2013. SHRIMP zircon age for a K-bentonite in the top of the Laobao Formation at the Pingyin section, Guizhou, South China. Sci China Earth Sci, 56: 1677–1687 Zhu M Y 1997. Precambrian-Cambrian Trace Fossils from Eastern Yunnan: Implications for Cambrian Explosion. Bull Natl Mus Nat Sci, 10: 275–312 Zhu M Y, Babcock L E, Peng S C. 2006. Advances in Cambrian stratigraphy and paleontology: Integrating correlation techniques, paleobiology, taphonomy and paleoenvironmental reconstruction. Palaeoworld, 15: 217–222 Zhu M Y, Li G X, Zhang J M, Steiner M, Qian Y, Jiang Z W. 2001. Early Cambrian stratigraphy of East Yunnan, southwestern China: A synthesis. Acta Palaeontol Sin, 40(Suppl): 4–39 Zhu M, Yang A, Yuan J, Li G, Zhang J, Zhao F, Ahn S Y, Miao L. 2019. Cambrian integrative stratigraphy and timescale of China. Sci China Earth Sci, 62: 25–60 Zhu M Y, Yang B, Ahn S Y, Tsukui K, Zhuravlev A Yu, Steiner M, Zhao F C, Ramezani J, Wood R A, Bowring S A. 2017b. Insight into the base of the Cambrian: New data from South China and Siberia. In: Mcllroy G, ed. Abstract Volume of the International Symposium on the Ediacaran-Cambrian Transition. 135 Zhu M Y, Zhang J M, Babcock L E, Bowring S A, Ahn S Y, He T C, Yang A H, Li G X, Zhao F C, Yin Z J. 2015. Identification and correlation of the Cambrian base: Problems and potential solutions. In: Giilli E, Piller W E, eds. STRATI 2015, Abstract Ber Inst Erdwiss K-F-Univ Graz, Band 21. 436 Zhu M Y, Zhang J M, Steiner M, Yang A H, Li G X, Erdtmann B D. 2003. Sinian-Cambrian stratigraphic framework for shallow- to deep-water environments of the Yangtze Platform: An integrated approach. Prog Nat Sci, 13: 951–960 Zhu M Y, Zhuravlev A Y, Wood R A, Zhao F C, Sukhov S S. 2017a. A deep root for the Cambrian explosion: Implications of new bio- and chemostratigraphy from the Siberian Platform. Geology, 45: 459–462 Zhu R X, Li X H, Hou X G, Pan Y X, Wang F, Deng C L, He H Y. 2009. SIMS U-Pb zircon age of a tuff layer in the Meishucun section, Yunnan, southwest China: Constraint on the age of the Precambrian-Cambrian boundary. Sci China Ser D-Earth Sci, 52: 1385–1392