DOI: 10.1016/j.palaeo.2016.03.006
论文题名: Secular changes in environmental stresses and eukaryotes during the Early Triassic to the early Middle Triassic
作者: Saito R. ; Kaiho K. ; Oba M. ; Tong J. ; Chen Z.-Q. ; Takahashi S. ; Chen J. ; Tian L. ; Biswas R.K.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 451 起始页码: 35
结束页码: 45
语种: 英语
英文关键词: Cyanobacteria
; Delayed biotic recovery
; Early Triassic
; Eukaryotic algae
; Oceanic anoxia
; Organic geochemistry
英文摘要: The Early Triassic, following the end-Permian mass extinction, was an interval of severe low diversity. Increasing amounts of evidence demonstrate that variable environmental stresses were widespread and intense after the end-Permian mass extinction. Here we report biomarkers from lowest Triassic to lower Middle Triassic strata in South China (Qingyan and Chaohu sections), including biomarkers for environmental stress (2-methyl hopane index) and eukaryotic algae (steranes and C21 n-alkylbenzene ratio). Using the 2-methyl hopane index, we detected the persistence of environmental stress during most of the Early Triassic. Using steranes and the C21 n-alkylbenzene ratio, we found a gradual increase in the biomass of eukaryotic algae during the Early to early Middle Triassic. A decrease in environmental stress in the Qingyan section (Leidapo Member) during the early Middle Triassic was synchronous with the "explosion" of the Qingyan Biota, which is characterized by a high abundance and diversity of invertebrate marine animals. Because the environmental stresses revealed by the 2-methyl hopane index encompass various factors (e.g., pH and temperature), we cannot identify the exact stresses at that time; however, our results reflect the amelioration of harsh environments for life during the interval of complete biotic recovery. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68445
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geology and Paleontology, Tohoku University, Sendai, Japan; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China
Recommended Citation:
Saito R.,Kaiho K.,Oba M.,et al. Secular changes in environmental stresses and eukaryotes during the Early Triassic to the early Middle Triassic[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,451