DOI: 10.1016/j.earscirev.2019.102906
论文题名: Age of the Barremian–Aptian boundary and onset of the Cretaceous Normal Superchron
作者: Olierook H.K.H. ; Jourdan F. ; Merle R.E.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 197 语种: 英语
中文关键词: 40Ar/39Ar geochronology
; Chron C34n
; Chron M0r
; Cretaceous Quiet Zone
; Geological time scale
; GSSP
英文关键词: Aptian
; argon-argon dating
; Barremian
; geochronology
; geological time
; stratigraphic boundary
; stratotype
; timescale
英文摘要: The age assigned to the boundary of the Barremian and Aptian stages remains one of the most poorly constrained post-Pangean stratigraphic boundaries. The lack of a Global Boundary Stratotype Section and Point (GSSP) for the stage boundary has hampered efforts to calibrate the absolute age of the Cretaceous period in the geological time scale. The current definition of the Barremian–Aptian boundary also approximates the onset of magnetic polarity chron M0r; the end of this chron denotes the start of the Cretaceous Normal polarity Superchron that is of fundamental importance for plate reconstructions. Currently, there is up to 5% discrepancy in the age estimates of the Barremian–Aptian boundary (ca. 126–121 Ma) and the start of the Cretaceous Normal Superchron. Here, we review available geochronological information from the late Barremian and early Aptian stages collected from the Pacific Ocean, China, California, the Ontong Java Nui large igneous province and the High Arctic large igneous province. By utilizing only robust geochronological data including U-Pb and recalibrated 40Ar/39Ar ages from sites with magnetic polarity information and/or paleontological constraints, we calculate a best estimate of between 123.8 and 121.8 Ma for the Barremian–Aptian boundary and the onset of chron M0r at 2σ confidence. Using estimates of the duration of chron M0r (0.49 ± 0.10 Myr, 2σ), we conservatively compute the start of the Cretaceous Normal Superchron to between 123.4 and 121.2 Ma (2σ). Using an age of 83.07 ± 0.15 Ma (2σ) for the end of the Cretaceous Normal Superchron, the duration of the superchron is also constrained to between 38.0 and 40.5 Myr (2σ). These age ranges for the Barremian–Aptian boundary, the onset of the Cretaceous Normal Superchron and the duration of the superchron currently provide the best estimates until a GSSP is formally ratified. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165901
Appears in Collections: 气候变化与战略
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作者单位: School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Centre for Exploration Targeting – Curtin Node, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; John de Laeter Centre, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Western Australian Argon Isotope Facility & JdL Centre, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Swedish Museum of Natural History, Stockholm, S-104 05, Sweden
Recommended Citation:
Olierook H.K.H.,Jourdan F.,Merle R.E.. Age of the Barremian–Aptian boundary and onset of the Cretaceous Normal Superchron[J]. Earth Science Reviews,2019-01-01,197