气候变化领域集成服务门户(CCPortal): Terrestrial and marginal-marine record of the mid-Cretaceous Oceanic Anoxic Event 2 (OAE 2): High-resolution framework; carbon isotopes; CO 2 and sea-level change

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DOI	10.1016/j.palaeo.2019.03.019
	Terrestrial and marginal-marine record of the mid-Cretaceous Oceanic Anoxic Event 2 (OAE 2): High-resolution framework; carbon isotopes; CO 2 and sea-level change
	Laurin J.; Barclay R.S.; Sageman B.B.; Dawson R.R.; Pagani M.; Schmitz M.; Eaton J.; McInerney F.A.; McElwain J.C.
发表日期	2019
ISSN	0031-0182
起始页码	118
结束页码	136
卷号	524
英文摘要	Oceanic Anoxic Event 2 (OAE2; c. 94.5–93.9 Ma) offers insight into the mechanisms of past climate change linked to organic productivity and carbon sequestration. It has been studied extensively, but the vast majority of data come from marine records, thus providing an incomplete view of past climate dynamics. Here we integrate new high-resolution data and published records on depositional environments, the carbon-isotope composition of bulk organic carbon (δ 13 C org ) and plant cuticles (δ 13 C cut ), and stomatal-index values, a proxy for pCO 2 , in well-preserved terrestrial through marginal-marine archives of the initial phase of OAE2. The study area is located on the western margin of the Western Interior Seaway (southwestern Utah). Age constraints are based on a new U-Pb bentonite age and correlation to an orbitally calibrated interval of the Bridge Creek Limestone. n-Alkane abundance suggests predominance of terrestrial contributions to bulk organic carbon for most samples. Despite similarities between carbon-isotope variations and transgressive-regressive shoreline movements, it is argued that δ 13 C org and δ 13 C cut are not strongly affected by local variables. A series of negative, ~2‰ carbon-isotope excursions is identified and attributed to changes in the size and isotopic value of the atmospheric CO 2 reservoir. The temporal spacing of these anomalies (80–120 kyr) is consistent with changes in insolation modulated by orbital eccentricity. A systematic, phase-shifted relationship between the negative carbon-isotope excursions and transgressive increments further suggests a link between carbon-cycle perturbations and meter-scale sea-level change on the 100-kyr time scale. A conceptual model involving insolation-controlled aquifer charge/discharge and biomass burial/degradation in the monsoonal belt is proposed. The framework presented here is available to facilitate further research on the interplay of terrestrial and oceanic carbon reservoirs during OAE2. © 2019 Elsevier B.V.
英文关键词	Carbon cycle; Cenomanian; Cretaceous; Milankovitch cycles; Orbital eccentricity; Paleoclimate
语种	英语
scopus关键词	anoxic conditions; aquifer; bentonite; biomass; carbon cycle; carbon dioxide; carbon isotope; carbon sequestration; Cenomanian; climate change; climate variation; Cretaceous; organic carbon; paleoclimate; sea level change; terrestrial environment; Bridge Creek; Oregon; United States; Utah; Western Interior
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150974
作者单位	Institute of Geophysics, Academy of Sciences of the Czech Republic, Boční II/1401, Praha 4, Czech Republic; Department of Paleobiology, Smithsonian Institution, National Museum of Natural History, 10th & Constitution Avenue NW, Washington, DC 20560-0121, United States; Department of Earth & Planetary Sciences, Northwestern University, 2145 Sheridan Road Technological Institute, Evanston, IL 60208, United States; Department of Geology and Geophysics, Yale University, New Haven, CT 06520, United States; Department of Geosciences, Boise State University, 1910 University Drive, Boise, United States; P.O. Box 231, Tropic, UT 84776, United States; Department of Earth Sciences, University of Adelaide, Adelaide, SA, Australia; Department of Botany, Trinity College Dublin, College Green, Dublin 2, Ireland
推荐引用方式 GB/T 7714	Laurin J.,Barclay R.S.,Sageman B.B.,et al. Terrestrial and marginal-marine record of the mid-Cretaceous Oceanic Anoxic Event 2 (OAE 2): High-resolution framework; carbon isotopes; CO 2 and sea-level change[J],2019,524.
APA	Laurin J..,Barclay R.S..,Sageman B.B..,Dawson R.R..,Pagani M..,...&McElwain J.C..(2019).Terrestrial and marginal-marine record of the mid-Cretaceous Oceanic Anoxic Event 2 (OAE 2): High-resolution framework; carbon isotopes; CO 2 and sea-level change.Palaeogeography, Palaeoclimatology, Palaeoecology,524.
MLA	Laurin J.,et al."Terrestrial and marginal-marine record of the mid-Cretaceous Oceanic Anoxic Event 2 (OAE 2): High-resolution framework; carbon isotopes; CO 2 and sea-level change".Palaeogeography, Palaeoclimatology, Palaeoecology 524(2019).