DOI: 10.1016/j.gloplacha.2012.02.008
论文题名: Plankton and productivity during the Permian-Triassic boundary crisis: An analysis of organic carbon fluxes
作者: Algeo T.J. ; Henderson C.M. ; Tong J. ; Feng Q. ; Yin H. ; Tyson R.V.
刊名: Global and Planetary Change
ISSN: 0921-8301
出版年: 2013
卷: 105 起始页码: 52
结束页码: 67
语种: 英语
英文关键词: Mass extinction
; Organic carbon accumulation rates
; Primary productivity
; Sedimentation rates
; South China
; Total organic carbon
Scopus关键词: Carbon accumulation
; Mass extinction
; Primary productivity
; Sedimentation rates
; South China
; Total Organic Carbon
; Geographical distribution
; Photosynthesis
; Phytoplankton
; Productivity
; Sedimentation
; Sedimentology
; Uncertainty analysis
; Weathering
; Organic carbon
; carbon flux
; chemical weathering
; geographical distribution
; mass extinction
; Permian-Triassic boundary
; plankton
; primary production
; radiometric method
; redox potential
; resolution
; sedimentation
; total organic carbon
; water column
; China
英文摘要: Changes in marine primary productivity following the latest Permian mass extinction (LPME) have been debated at length, with little resolution to date owing to a paucity of quantitative data. Herein, we report total organic carbon (TOC) concentrations and organic carbon accumulation rates (OCAR) for 40 Permian-Triassic boundary (PTB) sections with a near-global distribution and consider their implications for changes in marine productivity during the boundary crisis. Many sections in South China exhibit abrupt declines in TOC and OCAR from the Changhsingian (latest Permian) to the Griesbachian (earliest Triassic), a pattern not observed for sections in other regions. This pattern cannot be explained through secular changes in sedimentation rates, sedimentary facies, or redox conditions, all of which would have favored higher (rather than lower) TOCs and OCARs during the Griesbachian. Further, back-calculation of OC fluxes demonstrate that this pattern cannot be attributed to diagenetic loss of OC in the sediment or, possibly, to OC remineralization in the water column. The most likely explanation is a collapse of marine primary productivity across the South China region concurrently with the LPME and continuing for an extended interval into the Early Triassic. The productivity crash as well as the coeval decimation of benthic marine fauna coincided with deposition of the "boundary clay" at Meishan D, suggesting that both events were related to a large explosive volcanic eruption of uncertain provenance. In other PTB sections having a wide geographic distribution, OCARs increased on average by a factor of ~. 4. × across the LPME, largely owing to a concurrent increase in bulk accumulation rates (BARs). Radiometric dating uncertainties can account at most for only a fraction of the secular change in BARs, which are likely to reflect an increase in subaerial weathering rates and elevated fluxes of detrital material to Early Triassic marine systems. Intensification of chemical weathering relative to physical weathering may have increased the flux of nutrients to the Early Triassic ocean, enhancing marine productivity and contributing to the widespread development of marine dysoxia-anoxia. © 2012 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876958391&doi=10.1016%2fj.gloplacha.2012.02.008&partnerID=40&md5=611bfd99ab7fb85f2091ce9d65f43e32
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11207
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Geology, University of Cincinnati, Cincinnati, OH 45221, United States
Recommended Citation:
Algeo T.J.,Henderson C.M.,Tong J.,et al. Plankton and productivity during the Permian-Triassic boundary crisis: An analysis of organic carbon fluxes[J]. Global and Planetary Change,2013-01-01,105.