气候变化领域集成服务门户(CCPortal): The antiquity of the Sahara Desert: New evidence from the mineralogy and geochemistry of Pliocene paleosols on the Canary Islands; Spain

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DOI	10.1016/j.palaeo.2019.109245
	The antiquity of the Sahara Desert: New evidence from the mineralogy and geochemistry of Pliocene paleosols on the Canary Islands; Spain
	Muhs D.R.; Meco J.; Budahn J.R.; Skipp G.L.; Betancort J.F.; Lomoschitz A.
发表日期	2019
ISSN	0031-0182
卷号	533
英文摘要	The Sahara is the largest warm desert in the world, but its age has been controversial, with estimates ranging from Miocene to Holocene. Mineralogical and geochemical data show that paleosols of Pliocene to mid-Pleistocene age on Fuerteventura and Gran Canaria in the Canary Islands have developed in part from inputs of dust from Africa. These paleosols contain quartz and mica, minerals that are abundant in African dust but are rare in the basaltic rocks that dominate the Canary Islands. Trace elements with minimal mobility, Sc, Cr, Hf, Th, and Ta as well as the rare earth elements, show that paleosols have compositions that are intermediate between those of local rocks and African-derived dust. Thus, results reported here and in a recently published study by others indicate that 9 paleosols record delivery of African dust to the Canary Islands between ~4.8–2.8 Ma, ~3.0–2.9 Ma, ~2.3–1.46 Ma, and ~0.4 Ma. A long-term paleosol record of African dust input agrees with deep-sea records off the coast of western Africa that imply increased dust fluxes to the eastern Atlantic Ocean at ~4.6 Ma. It is concluded that the Sahara Desert has been in existence as an arid-region dust source, at least intermittently, for much of the Pliocene and continuing into the Pleistocene. © 2019
英文关键词	African dust; Aridity; Clay minerals; Paleoclimate; Trace elements
语种	英语
scopus关键词	clay mineral; dust; Holocene; mineralogy; Miocene; paleoclimate; paleosol; Pliocene; Pliocene-Pleistocene boundary; rare earth element; trace element; Atlantic Ocean; Atlantic Ocean (East); Canary Islands; Fuerteventura; Gran Canaria; Las Palmas; Sahara; Spain
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/150829
作者单位	U.S. Geological Survey, MS 980, Box 25046, Federal Center, Denver, CO 80225, United States; Departamento de Biología, Universidad de Las Palmas de Gran Canaria, 35017 Las Palmas de Gran CanariaCanary Islands, Spain; Instituto de Oceanografía y Cambio Global, IOCAG – Unidad Asociada de I+D+i al CSIC, Universidad de Las Palmas de Gran Canaria, ULPGC, Las Palmas de Gran Canaria, Canary Islands 35017, Spain
推荐引用方式 GB/T 7714	Muhs D.R.,Meco J.,Budahn J.R.,et al. The antiquity of the Sahara Desert: New evidence from the mineralogy and geochemistry of Pliocene paleosols on the Canary Islands; Spain[J],2019,533.
APA	Muhs D.R.,Meco J.,Budahn J.R.,Skipp G.L.,Betancort J.F.,&Lomoschitz A..(2019).The antiquity of the Sahara Desert: New evidence from the mineralogy and geochemistry of Pliocene paleosols on the Canary Islands; Spain.Palaeogeography, Palaeoclimatology, Palaeoecology,533.
MLA	Muhs D.R.,et al."The antiquity of the Sahara Desert: New evidence from the mineralogy and geochemistry of Pliocene paleosols on the Canary Islands; Spain".Palaeogeography, Palaeoclimatology, Palaeoecology 533(2019).