气候变化领域集成服务门户(CCPortal): Early-Middle Triassic boundary interval: Integrated chemo-bio-magneto-stratigraphy of potential GSSPs for the base of the Anisian Stage in South China

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DOI	10.1016/j.epsl.2019.115863
	Early-Middle Triassic boundary interval: Integrated chemo-bio-magneto-stratigraphy of potential GSSPs for the base of the Anisian Stage in South China
	Chen Y.; Jiang H.; Ogg J.G.; Zhang Y.; Gong Y.; Yan C.
发表日期	2020
ISSN	0012821X
卷号	530
英文摘要	The Wantou and Youping sections of Guangxi, South China provide a detailed high-resolution integrated calibration of the Early-Middle Triassic boundary succession for lithostratigraphy, volcanic episodes, conodont first occurrences (FOs), ammonoid biostratigraphy, geomagnetic polarity, inorganic carbon isotopes, sea-surface temperatures derived from conodont-apatite oxygen-isotopes, and ID-TIMS U–Pb radiometric dating. The upper Spathian (late Early Triassic) magnetostratigraphy is characterized by normal polarity (magnetozone LT9n) that encompasses the FOs of the typical Spathian conodonts Triassospathodus homeri and Gladigondolella carinata, the late Spathian Neopopanoceras haugi ammonoid zone and the beginning of a progressive positive shift in inorganic carbon isotopes. The overlying reversed polarity interval (LT9r) contains two brief normal-polarity subzones (MT1n and MT2n) that can be recognized in several other marine and terrestrial sections. The FO of conodont Chiosella timorensis sensu stricto, a proposed base-Anisian global marker, is near MT1n and near the end of the positive δ13Ccarb excursion. Sea-surface temperatures were reported to have cooled by 4 °C during this rise in δ13Ccarb, suggesting a sequestration of carbon dioxide. The lowermost Anisian at Wantou and Youping is dominated by normal polarity (MT3n, with the presence of one major reversed-polarity subzone MT3n.1r), contains the FO of typical Anisian conodonts (Gladigondolella tethydis/Magnigondolella alexanderi), and has the onset of a plateau in inorganic carbon isotopes values (stabilizing around +4‰). The combination of the FO of conodont Chiosella timorensis s.s., the brief normal polarity zone (MT1n) and the last portion of the rising carbon-isotope trend are suitable for primary proxies for global correlation of the Early-Middle Triassic boundary (base of Anisian) to other marine and non-marine settings. Radiometric dates at the Wantou and at the Guandao sections, coupled with a composite cyclostratigraphy for Early Triassic through Anisian, indicate that the FO of the conodont Chiosella timorensis s.s. is at approximately 246.7 Ma. © 2019 Elsevier B.V.
关键词	Chiosella timorensis sensu stricto conodonts global boundary stratotype section and point inorganic carbon isotopes magnetostratigraphy Olenekian-Anisian boundary
英文关键词	Atmospheric temperature; Carbon dioxide; Geomagnetism; Oceanography; Phosphate minerals; Radiometry; Stratigraphy; Submarine geophysics; Surface properties; Surface waters; Chiosella timorensis sensu stricto; conodonts; global boundary stratotype section and point; Inorganic carbon; Magnetostratigraphy; Olenekian-Anisian boundary; Isotopes; Anisian; carbon isotope; conodont; inorganic carbon; magnetostratigraphy; stratotype; uranium-lead dating; China; Guangxi Zhuangzu; Ammonoidea
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202542
作者单位	State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074, China; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051, United States; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China; Wuhan Center of Geological Survey, Wuhan, 430205, China; Henan Aero Geophysical Survey and Remote Sensing Center, Zhengzhou, 450053, China
推荐引用方式 GB/T 7714	Chen Y.,Jiang H.,Ogg J.G.,et al. Early-Middle Triassic boundary interval: Integrated chemo-bio-magneto-stratigraphy of potential GSSPs for the base of the Anisian Stage in South China[J],2020,530.
APA	Chen Y.,Jiang H.,Ogg J.G.,Zhang Y.,Gong Y.,&Yan C..(2020).Early-Middle Triassic boundary interval: Integrated chemo-bio-magneto-stratigraphy of potential GSSPs for the base of the Anisian Stage in South China.Earth and Planetary Science Letters,530.
MLA	Chen Y.,et al."Early-Middle Triassic boundary interval: Integrated chemo-bio-magneto-stratigraphy of potential GSSPs for the base of the Anisian Stage in South China".Earth and Planetary Science Letters 530(2020).