DOI: 10.1016/j.epsl.2017.11.042
Scopus记录号: 2-s2.0-85037358184
论文题名: Astrochronology of the Anisian stage (Middle Triassic) at the Guandao reference section, South China
作者: Li M. ; Huang C. ; Hinnov L. ; Chen W. ; Ogg J. ; Tian W.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 591
结束页码: 606
语种: 英语
英文关键词: cyclostratigraphy
; Early Triassic
; Great Bank of Guizhou
; magnetostratigraphy
; paleoclimate change
; timescale
Scopus关键词: Carbon
; Gamma rays
; Geomagnetism
; Magnetic polarity
; Magnetic susceptibility
; Cyclostratigraphy
; Guizhou
; Magnetostratigraphy
; Paleoclimate change
; Time-scales
; Triassic
; Sea level
; Anisian
; chronology
; climate variation
; cyclostratigraphy
; magnetostratigraphy
; paleoclimate
; sea level change
; Triassic
; China
; Guizhou
英文摘要: A high-precision global timescale for the Early and Middle Triassic is the key to understanding the nature, pattern and rates of biotic recovery following the end-Permian mass extinction. The Guandao section of Guizhou Province of South China is an important reference section for the magnetic polarity pattern, conodont datums, geochemical anomalies and interpreted temperature history through the Anisian (Middle Triassic). We analyzed the high-resolution gamma-ray and magnetic susceptibility series from the complete Anisian stage. Intensity variations are indicative of fluctuating terrestrial clay influxes showing strong signals that match predicted astronomical solutions for eccentricity and precession. Astronomical tuning of these series to interpreted 405-kyr long-eccentricity cycles yields a 5.3 Myr duration for the Anisian at Guandao. When combined with the astrochronology of the Early Triassic, then the projected age of the Anisian–Ladinian boundary relative to the base-Triassic date of 251.9 Ma is 241.5±0.1 Ma. This provides a 10-Myr reference timescale for other key geological events, including conodont zones, geomagnetic polarity chrons, rates of marine carbon- and oxygen isotope excursions and global sea-level changes, that were associated with the repeated biotic crises and recovery episodes after the end-Permian mass extinction. The middle Anisian humid phase in ca. 244–244.5 Ma was probably a global event, which may have been linked to the middle Anisian warming event and sea-level change. Sea-level fluctuations at Guandao generally correlate with those in western Tethyan and Boreal regions in time, confirming sea-level changes during the Anisian were of eustatic origin. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110119
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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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), Wuhan, 430074, China; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA 22030, United States; Department of Geosciences, Pennsylvania State University, University Park, PA 16802, United States; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051, United States
Recommended Citation:
Li M.,Huang C.,Hinnov L.,et al. Astrochronology of the Anisian stage (Middle Triassic) at the Guandao reference section, South China[J]. Earth and Planetary Science Letters,2018-01-01,482