DOI: 10.1016/j.epsl.2019.115863
论文题名: Early-Middle Triassic boundary interval: Integrated chemo-bio-magneto-stratigraphy of potential GSSPs for the base of the Anisian Stage in South China
作者: Chen Y. ; Jiang H. ; Ogg J.G. ; Zhang Y. ; Gong Y. ; Yan C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 530 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164920
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,530