气候变化领域集成服务门户(CCPortal): Revisiting the chronology and environmental conditions for the accretion of late Pleistocene-early Holocene Pampean loess (Argentina)

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DOI	10.1016/j.quascirev.2019.04.018
	Revisiting the chronology and environmental conditions for the accretion of late Pleistocene-early Holocene Pampean loess (Argentina)
	Torre G.; Gaiero D.M.; Sawakuchi A.O.; Río I.D.; Coppo R.
发表日期	2019
ISSN	0277-3791
起始页码	105
结束页码	119
卷号	213
英文摘要	The present research work reviews the age models of three previously studied loess sections across 700 km in the loess belt of the Pampean region in central Argentina. The loess sections were investigated for the first time through high-resolution luminescence dating in order to determine the chronology of the loess deposits and its temporal correlation with important palaeoclimatic records of the Southern Hemisphere. Reliable estimations of mass accumulation rates (MARs) for loess were used to infer the temporal dust flux variation during the last glacial/interglacial transition in southern South America. The new age models have significant differences compared to the previously published ones of likely Last Glacial Maximum (LGM) ages. The three studied sections showed general bimodal grain-size distributions consistent with multiple sources contributing dust to the Pampas. It is observed that higher MARs values are associated with an increased presence of finer loess. Increases in loess accumulation are coeval with climatic transitions from wetter to drier periods in the Puna-Altiplano Plateau, and high MARs are related to synchronous climatic shifts to humid conditions in the Pampean plain. Contrasting with dust fluxes observed in the more distal palaeoarchives (i.e., the South Atlantic Ocean and the Antarctic ice sheet) the new data suggest increased dust accumulation in the Pampas during the Antarctic Cold Reversal (ACR) and the Holocene. This supports the idea that changes related to atmospheric transport efficiency can better explain dust flux variations observed over glacial/interglacial periods in distant palaeoarchives. © 2019 Elsevier Ltd
英文关键词	Loess; Mass accumulation rate (MAR); Optically stimulated luminescence dating (OSL); Palaeoclimatology; Pampas; Quaternary; South America
语种	英语
scopus关键词	Atmospheric movements; Biomarkers; Dust; Glacial geology; Grain size and shape; Luminescence; Loess; Mass accumulation rates; Optically stimulated luminescence; Palaeoclimatology; Pampas; Quaternary; South America; Sediments; atmospheric transport; chronology; dust; environmental conditions; Last Glacial Maximum; loess; luminescence dating; paleoclimate; Pleistocene-Holocene boundary; research work; Altiplano; Argentina; Atlantic Ocean; Pampas; Puna
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151931
作者单位	CICTERRA/CONICET, Facultad de Ciencias Exactas, Físicas y Naturales, Av. Velez Sarfield 1611, Córdoba, X5016GCA, Argentina; Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562, São Paulo, SP 05508-080, Brazil; Departamento de Ciencias Geológicas, Universidad Católica del Norte, Av. Angamos, Antofagasta, 0610, Chile
推荐引用方式 GB/T 7714	Torre G.,Gaiero D.M.,Sawakuchi A.O.,et al. Revisiting the chronology and environmental conditions for the accretion of late Pleistocene-early Holocene Pampean loess (Argentina)[J],2019,213.
APA	Torre G.,Gaiero D.M.,Sawakuchi A.O.,Río I.D.,&Coppo R..(2019).Revisiting the chronology and environmental conditions for the accretion of late Pleistocene-early Holocene Pampean loess (Argentina).Quaternary Science Reviews,213.
MLA	Torre G.,et al."Revisiting the chronology and environmental conditions for the accretion of late Pleistocene-early Holocene Pampean loess (Argentina)".Quaternary Science Reviews 213(2019).