气候变化领域集成服务门户(CCPortal): Data-model comparison reveals key environmental changes leading to Cenomanian-Turonian Oceanic Anoxic Event 2

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DOI	10.1016/j.earscirev.2020.103123
	Data-model comparison reveals key environmental changes leading to Cenomanian-Turonian Oceanic Anoxic Event 2
	Joo Y.J.; Sageman B.B.; Hurtgen M.T.
发表日期	2020
ISSN	00128252
卷号	203
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
关键词	Box model Carbon cycle Cretaceous Large Igneous Province Mid-Cenomanian Event Oceanic Anoxic Event 2
英文关键词	anoxic conditions; carbon cycle; Cenomanian; Cretaceous; data set; environmental change; isotopic fractionation; large igneous province; sea level change; volcanism; Caribbean Islands
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203754
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
推荐引用方式 GB/T 7714	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],2020,203.
APA	Joo Y.J.,Sageman B.B.,&Hurtgen M.T..(2020).Data-model comparison reveals key environmental changes leading to Cenomanian-Turonian Oceanic Anoxic Event 2.Earth Science Reviews,203.
MLA	Joo Y.J.,et al."Data-model comparison reveals key environmental changes leading to Cenomanian-Turonian Oceanic Anoxic Event 2".Earth Science Reviews 203(2020).