DOI: 10.1016/j.gloplacha.2012.10.023
论文题名: Large vertical δ13CDIC gradients in Early Triassic seas of the South China craton: Implications for oceanographic changes related to Siberian Traps volcanism
作者: Song H. ; Tong J. ; Algeo T.J. ; Horacek M. ; Qiu H. ; Song H. ; Tian L. ; Chen Z.-Q.
刊名: Global and Planetary Change
ISSN: 0921-8303
出版年: 2013
卷: 105 起始页码: 7
结束页码: 20
语种: 英语
英文关键词: Anoxia
; Biological pump
; Biotic recovery
; Carbon isotopes
; Chemocline
; Mass extinction
; Oxygen minimum zone
Scopus关键词: Anoxia
; Biological pumps
; Carbon isotopes
; Chemocline
; Mass extinction
; Oxygen minimum zone
; Carbon
; Digital storage
; Seawater
; Isotopes
; anoxia
; biological pump
; carbon isotope
; data set
; depositional environment
; dissolved inorganic carbon
; disturbance
; global ocean
; global warming
; mass extinction
; nutrient enrichment
; oceanography
; oxygen minimum layer
; paleoenvironment
; Triassic
; vertical mixing
; volcanism
; water depth
; China
; Nanpanjiang Basin
英文摘要: Vertical gradients in the δ13C of seawater dissolved inorganic carbon (δδ13CDIC) can be estimated for paleomarine systems based on δ13Ccarb data from sections representing a range of depositional water depths. An analysis of eight Lower Triassic sections from the northern Yangtze Platform and Nanpanjiang Basin, representing water depths of ~50 to 500m, allowed reconstruction of δδ13CDIC in Early Triassic seas of the South China craton for seven time slices representing four negative (N) and three positive (P) carbon-isotope excursions: 8.5% (N1), 5.8% (P1), 3.5% (N2), 6.5% (P2), 7.8% (N3), -1.9% (P3), and 2.2% (N4). These values are much larger than vertical δ13CDIC gradients in the modern ocean (~1-3%) due to intensified stratification and reduced vertical mixing in Early Triassic seas. Peaks in δδ13CDIC around the PTB (N1) and in the early to mid-Smithian (P2-N3) coincided with episodes of strong climatic warming, reduced marine productivity, and expanded ocean anoxia. The Dienerian-Smithian boundary marks the onset of a major mid-Early Triassic disturbance, commencing ~1Myr after the latest Permian mass extinction, that we link to a second eruptive stage of the Siberian Traps. Inhospitable oceanic conditions generally persisted until the early Spathian, when strong climatic cooling caused re-invigoration of global-ocean circulation, leading to an interval of negative δδ13CDIC values and a sharp increase in δ13Ccarb driven by upwelling of nutrient-rich deepwaters. These developments marked the end of the main eruptive stage of the Siberian Traps. © 2012 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876957101&doi=10.1016%2fj.gloplacha.2012.10.023&partnerID=40&md5=2e86f6b6da079ca749db316de91f5057
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11209
Appears in Collections: 全球变化的国际研究计划
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作者单位: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
Recommended Citation:
Song H.,Tong J.,Algeo T.J.,et al. Large vertical δ13CDIC gradients in Early Triassic seas of the South China craton: Implications for oceanographic changes related to Siberian Traps volcanism[J]. Global and Planetary Change,2013-01-01,105.