气候变化领域集成服务门户(CCPortal): Paleoclimate reconstruction of the Prince Creek Formation; Arctic Alaska; during Maastrichtian global warming

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DOI	10.1016/j.palaeo.2019.109265
	Paleoclimate reconstruction of the Prince Creek Formation; Arctic Alaska; during Maastrichtian global warming
	Salazar-Jaramillo S.; McCarthy P.J.; Ochoa A.; Fowell S.J.; Longstaffe F.J.
发表日期	2019
ISSN	0031-0182
卷号	532
英文摘要	The Upper Cretaceous (Maastrichtian) Prince Creek Formation of Arctic Alaska (~82–85°N paleolatitude) preserves successions of alluvial paleosols that are used to estimate mean annual precipitation (MAP), mean annual temperature (MAT) and meteoric water oxygen isotope composition. For the Prince Creek Formation, the highest MAP estimates range between 1000 and 3900 mm/yr and the lowest range between 350 and 1200 mm/yr. The precipitation variability, derived from stable carbon isotope analysis, occurs on a time scale of 104 years. MAP values agree with previous interpretations from fossil pollen, pedological features, soil types, vegetation composition, sedimentological indicators and CLAMP estimates that suggest high precipitation amounts and high humidity. Despite the considerable uncertainty with MAT proxies, our values are consistent with warm month mean temperatures obtained previously from paleobotanical data. The δ18O of smectite from bentonite beds clusters around ~+5.0‰ (VSMOW). The δ18O of meteoric water calculated from bentonitic smectite is ~−23‰ (VSMOW), assuming a mean annual temperature of 6.3 °C, which is slightly more 18O-depleted than meteoric water calculated from pedogenic siderite in stratigraphically younger beds closer to the Brooks Range. Chronostratigraphic correlation with the lower Cantwell Formation, Denali National Park, Alaska (~64°N paleolatitude), suggests higher precipitation rates and highly 18O-depleted precipitation in the Late Cretaceous paleo-Arctic compared to central Alaska. These data are consistent with previous studies that suggest a warmer and moister greenhouse Earth and an intensified hydrological cycle that enhanced latent heat transport, resulting in increased rainout effects. © 2019 Elsevier B.V.
英文关键词	High-latitude; Meteoric water composition; Paleosol; Smectite; Stable isotopes
语种	英语
scopus关键词	carbon isotope; Cretaceous; global warming; hydrological cycle; latitude; Maastrichtian; meteoric water; oxygen isotope; paleoclimate; paleosol; precipitation (climatology); reconstruction; smectite; stable isotope; Alaska; Brooks Range; Denali National Park; United States
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/150851
作者单位	Universidad Nacional de Colombia, Departamento de Geociencias, Carrera 30 N° 45 – 03 Edificio 224, Bogotá, Colombia; University of Alaska Fairbanks, Department of Geosciences, and Geophysical Institute, Fairbanks, AK 99775-5780, United States; Universidad Nacional de Colombia, Departamento de Geociencias, Cl. 80 N° 65 – 223, Medellín, Colombia, Colombia; University of Alaska Fairbanks, Department of Geosciences, Fairbanks, AK 99775-5780, United States; The University of Western Ontario, Department of Earth Sciences, London, Ontario N6A 5B7, Canada
推荐引用方式 GB/T 7714	Salazar-Jaramillo S.,McCarthy P.J.,Ochoa A.,et al. Paleoclimate reconstruction of the Prince Creek Formation; Arctic Alaska; during Maastrichtian global warming[J],2019,532.
APA	Salazar-Jaramillo S.,McCarthy P.J.,Ochoa A.,Fowell S.J.,&Longstaffe F.J..(2019).Paleoclimate reconstruction of the Prince Creek Formation; Arctic Alaska; during Maastrichtian global warming.Palaeogeography, Palaeoclimatology, Palaeoecology,532.
MLA	Salazar-Jaramillo S.,et al."Paleoclimate reconstruction of the Prince Creek Formation; Arctic Alaska; during Maastrichtian global warming".Palaeogeography, Palaeoclimatology, Palaeoecology 532(2019).