气候变化领域集成服务门户(CCPortal): Paleoenvironmental reconstruction of the semi-arid Chaco region of Argentina based on multiproxy lake records over the last six hundred years

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DOI	10.1016/j.palaeo.2019.03.037
	Paleoenvironmental reconstruction of the semi-arid Chaco region of Argentina based on multiproxy lake records over the last six hundred years
	Speranza F.C.; Giralt S.; Lupo L.C.; Kulemeyer J.J.; Pereira E.D.L.Á.; López B.C.
发表日期	2019
ISSN	0031-0182
起始页码	85
结束页码	100
卷号	524
英文摘要	In this paper, we analyze the paleoclimatic and paleoenvironmental evolution of Laguna Yema in semi-arid Chaco region of Argentina over the past six hundred years. High resolution multiproxy studies of lake sediments utilize analyses of lithology, mineralogy, geochemistry, palynology, and are constrained by radiocarbon and gamma spectrometry dating. Laguna Yema sediments were mainly composed of well stratified fine sediments (silts and clays), with variable proportions of quartz, clays (illite) and feldspar (microcline and albite). Twelve light and heavy geochemical elements were registered. Most elements (Al, Si, K, Ti, Fe, Rb, Ba, and Br) are associated with illite and albite. Different material transport processes related to the changes in aridity and humidity of the basin were identified using the main mineralogical origins of geochemical elements. Palynological records indicate cycles of contraction and expansion of the lake, with an increase in concentration of Alternanthera aquatica during wet periods (expansion of lake), and an increase in Ambrosia, Poaceae and fern spores during dry periods (contraction of lake). These changes are linked to fluctuations in moisture conditions in the Subandean Mountains and semi-arid Chaco regions, in response to interactions between the South American Monsoon System (SAMS) and the South American Low Level Jet (SALLJ), which send warm and humid air to northern Argentina. In a regional context, the Laguna Yema records are in accordance with the analyses of the temporal and spatial pattern of moisture distribution for the last six centuries. © 2019 Elsevier B.V.
英文关键词	Bermejo basin; Palynology; Sedimentology; South American Arid Diagonal; South American Low Level Jet; South American Monsoon System
语种	英语
scopus关键词	dating method; dicotyledon; fossil record; lacustrine deposit; paleoclimate; paleoenvironment; palynology; proxy climate record; reconstruction; sedimentology; semiarid region; Argentina; Bermejo Basin; Chaco [Argentina]; Alternanthera; Ambrosia; Filicophyta; Poaceae
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/150977
作者单位	Instituto Nacional de Tecnología Agropecuaria, RN N° 34 Km 1286, Yuto, Jujuy 4518, Argentina; Institute of Earth Sciences Jaume Almera (ICTJA-CSIC), C/Lluís Solé i Sabarís s/n, Barcelona, 08028, Spain; Instituto de Ecorregiones Andinas (INECOA), CONICET, Universidad Nacional de Jujuy, Av. Bolivia 1239, San Salvador de Jujuy, Jujuy 4600, Argentina; Laboratorio de Palinología, Cátedra de Ecología General, Facultad de Ciencias Agrarias, Universidad Nacional de Jujuy, Alberdi 47, San Salvador de Jujuy, Jujuy 4600, Argentina; Cátedra de Ciencias de la Tierra, Facultad de Ciencias Agrarias, Universidad Nacional de JujuyJujuy, Argentina; Cátedra de Suelos, Facultad de Ingeniería, Universidad Nacional de Jujuy, Italo Palanca 10, San Salvador de Jujuy, Jujuy 4600, Argentina; InDyA, Conicet-UNJu, UNT, Pcia. de Jujuy, Av. Gral. Martijena S/N, Palpalá, Jujuy, Argentina; CREAF, Universitat Autònoma de Barcelona, Edifici C (Facultat de Ciències), Barcelona, Catalonia, Spain; Unitat d'Ecologia, Departament de Biolog...
推荐引用方式 GB/T 7714	Speranza F.C.,Giralt S.,Lupo L.C.,et al. Paleoenvironmental reconstruction of the semi-arid Chaco region of Argentina based on multiproxy lake records over the last six hundred years[J],2019,524.
APA	Speranza F.C.,Giralt S.,Lupo L.C.,Kulemeyer J.J.,Pereira E.D.L.Á.,&López B.C..(2019).Paleoenvironmental reconstruction of the semi-arid Chaco region of Argentina based on multiproxy lake records over the last six hundred years.Palaeogeography, Palaeoclimatology, Palaeoecology,524.
MLA	Speranza F.C.,et al."Paleoenvironmental reconstruction of the semi-arid Chaco region of Argentina based on multiproxy lake records over the last six hundred years".Palaeogeography, Palaeoclimatology, Palaeoecology 524(2019).