globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.03.007
Scopus记录号: 2-s2.0-84961954150
论文题名:
Eolian depositional phases during the past 50 ka and inferred climate variability for the Pampean Sand Sea, western Pampas, Argentina
作者: Tripaldi A.; Forman S.L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 139
起始页码: 77
结束页码: 93
语种: 英语
英文关键词: Argentina ; Dune field ; Eolian ; Paleoclimate ; Pampean Sand Sea
Scopus关键词: Lakes ; Sand ; Stratigraphy ; Argentina ; Dune fields ; Eolian ; Paleoclimates ; Pampean Sand Sea ; Deposition ; climate variation ; deposition ; dune field ; environmental response ; eolian deposit ; Heinrich event ; historical record ; monsoon ; Northern Hemisphere ; paleoclimate ; Quaternary ; shrub ; Southern Hemisphere ; vegetation type ; Andes ; Argentina ; Pampas ; San Luis
英文摘要: The Pampean Sand Sea, which occurs from the Argentinian Pampas to the eastern Andean piedmont, hosts presently stabilized dune fields spanning the late Quaternary. This study integrates previous results and presents new geomorphic, stratigraphic, sedimentological, and chronologic data for nineteen >2 m-thick eolian successions for the San Luis paleo-dune field, western Pampas, to better constrain the depositional history. Six eolian depositional phases are identified spanning the past 50 ka, interposed with paleosols and/or bounded by erosive surfaces. Age control was from 61 OSL ages of small aliquots of quartz grains from eolian stratigraphic units. The inferred timing of eolian phases are at ca. 70 ± 10 yr, 190 ± 20 yr, 12 to 1 ka, 22 to 17 ka, 29 to 24 ka, and 40 to 32 ka. A maximum span for periods of pedogenesis at ca. 12 to 17 ka, 22 to 24 ka, and 29 to 32 ka was provided by bounding OSL ages, which broadly overlap with high stands of pluvial lakes and glacier advances in the central Andes. We infer that the added precipitation may reflect expansion of the Southern Hemisphere monsoon, associated with Northern Hemisphere Heinrich events, leading to episodes of significantly wetter conditions (>350 mm MAP) to at least 35° S. Most of the Holocene (12 ka to 0.8 ka) was characterized by sand sheet deposit under drier than present conditions (100-450 mm MAP), associated with Monte-type vegetation (shrub steppe). The latest two eolian depositional phases, occurred at ca. 190 and 70 yr ago, during the historic period with European settlement and are related to anthropogenic landscape disturbance, though the youngest phase was concomitant with 1930s drought. Wet conditions dominated since ca. AD 1970 with new lakes and rivers forming across this eolian terrain; an incongruous environmental response in reference to drier conditions for most of the Holocene. © 2016 Elsevier Ltd.
资助项目: The authors'' gratitude is extended to able field assistance from H. Reinjestein, A. Quesada, T. Luppo, J. Perelló, P. Ciccioli, P. Forte, F. González Tomassini, N. Kubik, L. Marín, and T. Badger. Meteorological data were kindly provided by the Servicio Meteorológico Nacional (National Weather Service). Funding for this research was supported by Universidad de Buenos Aires (UBACyT20620100100009 and UBACyT20620130100002BA) and CONICET fellowship to AT ; and National Geographic Society Grant 8607-09 to SLF. Assistance in OSL dating was provided by J. Mazzoco, J. Pierson and L. Marín. The comments of the two journal reviews and the editor are highly appreciated. We are grateful to the many farmers and ranchers of San Luis Province whose generosity and hospitality made this study possible.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59624
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: IGEBA-CONICET, Dept. of Geological Sciences, University of Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina; Dept. of Geology, Baylor University, One Bear Place #97354, Waco, TX, United States

Recommended Citation:
Tripaldi A.,Forman S.L.. Eolian depositional phases during the past 50 ka and inferred climate variability for the Pampean Sand Sea, western Pampas, Argentina[J]. Quaternary Science Reviews,2016-01-01,139
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Tripaldi A.]'s Articles
[Forman S.L.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Tripaldi A.]'s Articles
[Forman S.L.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Tripaldi A.]‘s Articles
[Forman S.L.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.