DOI: 10.1016/j.earscirev.2020.103123
论文题名: Data-model comparison reveals key environmental changes leading to Cenomanian-Turonian Oceanic Anoxic Event 2
作者: Joo Y.J. ; Sageman B.B. ; Hurtgen M.T.
刊名: Earth-Science Reviews
ISSN: 128252
出版年: 2020
卷: 203 语种: 英语
英文关键词: Box model
; Carbon cycle
; Cretaceous
; Large Igneous Province
; Mid-Cenomanian Event
; Oceanic Anoxic Event 2
Scopus关键词: anoxic conditions
; carbon cycle
; Cenomanian
; Cretaceous
; data set
; environmental change
; isotopic fractionation
; large igneous province
; sea level change
; volcanism
; Caribbean Islands
英文摘要: The middle Cretaceous was a period characterized by elevated sea-floor spreading rates, enhanced volcanism, high atmospheric CO2 levels, warming temperatures, and the peak eustatic highstand of the Mesozoic. Two well-known perturbations in the global carbon cycle mark this interval – the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE2) and the Mid-Cenomanian Event (MCE). Although studies during the past two decades have arrived at a consensus that the Caribbean Large Igneous Province (LIP) likely played a key role in triggering OAE2, arguably the most significant perturbation of the Late Cretaceous, the detailed environmental developments during the Mid-Late Cenomanian leading up to it have only recently been the focus of investigations. This study, based on previous studies of the Middle Cenomanian – Early Turonian climate, tectonics, sea level, and carbon isotope chemostratigraphy, tests plausible environmental scenarios to explain the behavior of the Middle Cenomanian to Early Turonian carbon cycle, via isotope-mass balance calculation in a simple carbon cycle box model. The model experiments successfully reproduce two distinctive features observed in the Mid-Late Cenomanian δ13C curves - 1) decoupling of δ13Ccarb and δ13Corg reflecting increasing isotope fractionation in response to steadily rising pCO2, driven by enhanced volcanic degassing of mantle-derived CO2, which likely preceded the presumed peak volcanism of the Caribbean LIP; and 2) a long-lived, secondary positive excursion that documents enhanced organic carbon burial in shallow shelf seas that expanded during global sea-level rise and highstand. We demonstrate a plausible combination of environmental forcings that pre-conditioned the mid-Cretaceous ocean-atmosphere system for a massive perturbation, OAE2. © 2020 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158467
Appears in Collections: 气候变化与战略
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作者单位: Division of Polar Paleoenvironment, Korea Polar Research Institute, 26 Songdomirae-ro, Incheon, 21990, South Korea; Department of Earth & Planetary Sciences, Northwestern University, Evanston, IL 60208, United States
Recommended Citation:
Joo Y.J.,Sageman B.B.,Hurtgen M.T.. Data-model comparison reveals key environmental changes leading to Cenomanian-Turonian Oceanic Anoxic Event 2[J]. Earth-Science Reviews,2020-01-01,203