DOI: 10.1016/j.palaeo.2015.09.003
论文题名: Increase of seawater Mo inventory and ocean oxygenation during the early Cambrian
作者: Wang X. ; Shi X. ; Zhao X. ; Tang D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440 起始页码: 621
结束页码: 631
语种: 英语
英文关键词: Early Cambrian
; Mo/TOC ratio
; Ocean oxygenation
; Redox sensitive trace elements
; South China
英文摘要: The early Cambrian radiation of macroscopic animals, commonly referred as the 'Cambrian Explosion', is one of the most important biological innovations in Earth history. Because oxygen is a requirement for complex animal life, it is generally accepted that ocean oxygenation may have been the environmental trigger for animal evolution, but direct geochemical evidence supporting oxygen increase prior to the 'Cambrian Explosion' remains sparse and insufficient. To better understand the casual relationship between ocean oxygenation and animal evolution, we have carried out a systematic analysis of redox sensitive trace element (RSTE) concentrations, total organic carbon (TOC) contents and pyrite morphology for the early Cambrian Niutitang Formation of the Hejiapu section, northeastern Guizhou Province, South China. The new data, in combination with previously published data from other sections, show strong Mo enrichments (average of 88. ppm) and high Mo/TOC ratios (average of 14. ppm/wt.%) in the euxinic black shales of the lower Niutitang Formation (~520. Ma), indicating increase of the oceanic Mo reservoir. In the light of the positive correlation between sediment Mo/TOC and aqueous Mo in modern basins, the early Cambrian oceanic Mo concentration is estimated as ~50. nmol, which is about half of the modern ocean Mo concentration (~105. nmol) but is significantly higher than that of the Mesoproterozoic oceans (10-20. nmol). The marked increase in oceanic Mo reservoir is therefore interpreted as recording significant rise of atmospheric oxygen and pervasive ocean oxygenation, which may have facilitated the diversification of macroscopic metazoans during the early Cambrian. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68762
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Biogeology and Environmental Geology, Beijing, China; School of Earth Sciences and Resources, China University of Geosciences, Beijing, China; Science Research Institute, China University of Geosciences, Beijing, China
Recommended Citation:
Wang X.,Shi X.,Zhao X.,et al. Increase of seawater Mo inventory and ocean oxygenation during the early Cambrian[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440