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DOI	10.1016/j.palaeo.2017.09.001
	An intercalibrated Triassic conodont succession and carbonate carbon isotope profile; Kamura; Japan
	Zhang L.; Orchard M.J.; Algeo T.J.; Chen Z.-Q.; Lyu Z.; Zhao L.; Kaiho K.; Ma B.; Liu S.
发表日期	2019
ISSN	0031-0182
起始页码	65
结束页码	83
卷号	519
英文摘要	The Kamura section, located in the Chichibu Belt of Kyushu Island in southern Japan, contains a succession of uppermost Permian to Upper Triassic shallow-marine atoll sediments from the mid-Panthalassic Ocean. In the present study, carbonate microfacies, conodont biostratigraphy, and carbonate carbon isotopes were analyzed, making it possible to construct a detailed biochronological framework for the Triassic of the central Panthalassic region. A total of 14 conodont zones are recognized from the uppermost Changhsingian to the upper Norian. The Lower Triassic contains the Hindeodus parvus, Isarcicella isarcica, and H. postparvus zones (Griesbachian), the Neospathodus dieneri Zone (Dienerian), and the Novispathodus ex gr. waageni-Parachirognathus Zone (Smithian), while no evidence of the upper Lower Triassic Spathian substage was recovered at Kamura. The overlying Middle Triassic section consists of the Chiosella ex gr. timorensis-Cratognathus, ‘Paragondolella’ ex gr. alpina-Pg. ex gr. excelsa, Budurovignathus hungaricus, and B. mungoensis zones, followed in the Upper Triassic by the Quadralella tadpole-Gladigondolella malayensis, Q. lobata-Q. carpathica, Primatella cf. orchardi-Pr. permica, Epigondolella rigoi-‘Pg.’ hallstattensis, and E. ex gr. bidentata-Norigondolella steinbergensis zones. The exact stratigraphic intervals present at Kamura were refined through intercalibration of the conodont biozonation data with its δ 13 C carb profile, which shows a characteristic series of negative and positive excursions that correspond to well-established global reference profiles. The Permian–Triassic boundary is placed 0.20 m above the Mitai-Kamura formation contact (a reference datum corresponding to the end-Permian extinction horizon, = 0 m) based on the first appearance of H. parvus, and the Olenekian–Anisian boundary is placed 17.60 m above the reference datum based on the first appearance of Ch. ex gr. timorensis. Kamura carbonates were assigned to six fabric types and 17 microfacies. The microfacies succession records a deepening immediately following the end-Permian mass extinction, a strong shallowing during the mid to late Smithian, development of an unconformity spanning the entire Spathian, and minor sea-level fluctuations during the Middle and Late Triassic. The Spathian unconformity is attributed to a eustatic fall related to a sharp cooling event at or close to the Smithian–Spathian boundary that exposed the Kamura atoll. The subsequent resumption of shallow-marine sedimentation in the earliest Middle Triassic was probably due to continued thermal subsidence of the oceanic crustal basement beneath the atoll. The present work is the most complete analysis to date of the conodont biostratigraphic, carbon isotope chemostratigraphic, and eustatic records of the Triassic System in the central Panthalassic Ocean and should serve as a regional reference standard in the future. © 2017
英文关键词	Eustasy; Griesbachian; Panthalassic Ocean; Permian–Triassic; Smithian–Spathian; δ 13 C
语种	英语
scopus关键词	atoll; biochronology; biostratigraphy; biozonation; calibration; carbon isotope; carbonate; conodont; eustacy; isotopic analysis; marine sediment; microfacies; paleoceanography; Permian-Triassic boundary; subsidence; succession; Chichibu; Honshu; Japan; Kanto; Kyushu; Saitama [Kanto]; Epigondolella; Hindeodus parvus; Isarcicella isarcica
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151052
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, United States; Geological Survey of Canada, 1500 - 625 Robson St., Vancouver, B.C. V6B 5J3, Canada; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China; Institute of Geology and Paleontology, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan
推荐引用方式 GB/T 7714	Zhang L.,Orchard M.J.,Algeo T.J.,et al. An intercalibrated Triassic conodont succession and carbonate carbon isotope profile; Kamura; Japan[J],2019,519.
APA	Zhang L..,Orchard M.J..,Algeo T.J..,Chen Z.-Q..,Lyu Z..,...&Liu S..(2019).An intercalibrated Triassic conodont succession and carbonate carbon isotope profile; Kamura; Japan.Palaeogeography, Palaeoclimatology, Palaeoecology,519.
MLA	Zhang L.,et al."An intercalibrated Triassic conodont succession and carbonate carbon isotope profile; Kamura; Japan".Palaeogeography, Palaeoclimatology, Palaeoecology 519(2019).