DOI: 10.1016/j.palaeo.2017.01.007
论文题名: A conodont-based revision of the 87Sr/86Sr seawater curve across the Permian-Triassic boundary
作者: Dudás F.Ö. ; Yuan D.-X. ; Shen S.-Z. ; Bowring S.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 470 起始页码: 40
结束页码: 53
语种: 英语
英文关键词: Abadeh
; Daijiagou
; Liangfengya
; Meishan
; Terrestrial extinction
英文摘要: Based on analyses of 565 conodonts from Meishan, Liangfengya, and Daijiagou (South China), and Abadeh (central Iran), we propose a revision of the seawater 87Sr/86Sr curve for the time period spanning 200 kyr prior to the Permian-Triassic boundary (PTB) to 330 kyr after the PTB. With carefully designed sample cleaning, conodonts faithfully record seawater 87Sr/86Sr. Seawater 87Sr/86Sr was 0.707030 ± 10,200 kyr prior to the PTB, rose to 0.707070 ± 10 approximately 39 kyr prior to the PTB (at the marine extinction horizon, the top of Bed 24e at Meishan), to 0.707080 ± 10 at the PTB, and to 0.707120 ± 20 at 330 kyr after the PTB. The rate of change of seawater 87Sr/86Sr was 0.0000185/Myr from the Capitanian minimum to } 100 kyr before the PTB, and was 0.00020 ± 7.5/Myr between } 100 kyr before and 330 kyr after the PTB. Over 6 Myr, this rate of change would result in a maximum 87Sr/86Sr of } 0.70825 at the end of the Early Triassic, compared with a model value of } 0.7080. The Sr data are consistent with the interpretation that the rise in marine 87Sr/86Sr was due primarily to an increase in the continental weathering and erosional flux, and that soil-binding vegetation was not re-established during most of the Early Triassic. The rapid rise in seawater 87Sr/86Sr began at least 30 kyr prior to the marine extinction at Meishan, indicating that the terrestrial extinction preceded that in the oceans. © 2017 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67924
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth, Atmospheric, Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
Recommended Citation:
Dudás F.Ö.,Yuan D.-X.,Shen S.-Z.,et al. A conodont-based revision of the 87Sr/86Sr seawater curve across the Permian-Triassic boundary[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,470