DOI: 10.1016/j.palaeo.2015.09.046
论文题名: Volcanism and deep-ocean acidification across the end-Triassic extinction event
作者: Ikeda M. ; Hori R.S. ; Okada Y. ; Nakada R.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440 起始页码: 725
结束页码: 733
语种: 英语
英文关键词: Acidification
; Aeolian dust
; Bedded chert
; Central Atlantic magmatic province (CAMP)
; Extinction
; Triassic-Jurassic
英文摘要: The end-Triassic extinction event marks one of the "big five" mass extinction events of the Phanerozoic. The ultimate cause of the extinction is considered to be volcanic activity at the Central Atlantic magmatic province (CAMP), yet the underlying nature of global environmental changes that accompanied the biotic turnover remains elusive. Here we present chemical and mineralogical studies across the end-Triassic extinction level of the deep-sea chert sequence (Inuyama, Japan). Depleted hematite content normalized by terrigenous material predated the end-Triassic extinction level with significant rock color change from brick red to purple, which is consistent with the rock magnetic records of hematite reported. This suggests the loss of authigenic hematite possibly due to the acidification of bottom-water and the underlying sediment pore-water. This timing is consistent with the initial eruption of CAMP volcanism, suggesting a catastrophic release of greenhouse gases as a cause of deep-ocean acidification. Across the end-Triassic extinction interval, MgO/Al2O3, Fe2O3/Al2O3, and Al2O3/SiO2 increased with change in color from purple to dusty red. This trend became close to those of weathered CAMP basalts in arid area, implying that it became the considerable source of aeolian dust in cherts after the end-Triassic extinction event. These temporal relations support the synchrony among the initial eruption of CAMP, deep-ocean acidification, and the end-Triassic extinction. Similar rock color changes of cherts might have potential information for the volcanisms and deep-ocean acidification in other geologic events. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68764
Appears in Collections: 过去全球变化的重建
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作者单位: Graduate school of Geoscience, Shizuoka University, Shizuoka, Shizuoka, Japan; Department of Earth Sciences, Graduate School of Science and Engineering, Ehime University, Matsuyama, Ehime, Japan; Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, Japan; Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Nankoku, Kochi, Japan
Recommended Citation:
Ikeda M.,Hori R.S.,Okada Y.,et al. Volcanism and deep-ocean acidification across the end-Triassic extinction event[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440