Arid
DOI10.1016/j.catena.2011.05.013
Environmental response of a fragile, semiarid landscape (Bardenas Reales Natural Park, NE Spain) to Early Holocene climate variability: A paleo- and environmental-magnetic approach
Gomez-Paccard, M.1; Larrasoana, J. C.1,2; Sancho, C.3; Munoz, A.3; McDonald, E.4; Rhodes, E. J.5; Osacar, M. C.3; Costa, E.6; Beamud, E.7
通讯作者Gomez-Paccard, M.
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2013
卷号103页码:30-43
英文摘要

The Bardenas Reales Natural Park (western Ebro Basin, NE Spain) constitutes a fragile landscape where the prevailing semiarid climate and erodability of the bedrock have resulted in high sensitivity to erosion/sedimentation oscillations during the Holocene. In this paper, we present new chronologic, sedimentologic, paleomagnetic and environmental magnetic results from the oldest unit (Qah1) of a system of nested cut-and-fill alluvial sequences, which is 18 m thick and crops out extensively in the central part of the natural park at the Bardena Blanca Depression. Radiocarbon dating indicates that Early Holocene unit Qah1 is younger than 9.38-8.89 cal kyr BP and gives ages of 8.92-8.42 and 7.59-737 cal kyr BP in the middle and uppermost parts of the unit, respectively. Sedimentologic data indicate that distal alluvial sediments of unit Qah1 accumulated in sandy mud flats and ephemeral playa lakes under arid conditions. The coincidence of enhanced magnetite content with moderate to intense root bioturbation in the lowermost and likely also uppermost sediments of unit Qah1 suggests that magnetite formed authigenically in response to relatively wetter conditions at the beginning and end of this dry period. These results indicate that onset and cessation of alluvial aggradation mark the passing of a geomorphologic threshold, most likely plant cover in the watershed, during a progressive drying wetting event. The radiocarbon-based age model of unit Qah1 indicates that alluvial aggradation under arid conditions began at 9.13 cal kyr BP and ended at 7.16 cal kyr BP. This period is strikingly centered at around the 8.2 kyr cold event but spans a longer time period, supporting the notion of a global climatic deterioration as the underlying cause for this event. Paleomagnetic directions do not clearly display the characteristic patterns recognized in paleosecular variation curves, derived from other European lacustrine sediments and cannot be used to refine the radiocarbon-based age model for unit Qah1. Our results demonstrate a quick and strong response of alluvial systems to Early Holocene climate variability in fragile Mediterranean landscapes such as those at the semiarid Bardenas Reales Natural Park. (C) 2011 Elsevier B.V. All rights reserved.


英文关键词Paleomagnetism Environmental magnetism Early Holocene Alluvial sediments Climate variability Iberian Peninsula
类型Article
语种英语
国家Spain ; USA
收录类别SCI-E
WOS记录号WOS:000314486200004
WOS关键词PALEOMAGNETIC SECULAR VARIATION ; CENTRAL EBRO BASIN ; FLUVIAL CHRONOLOGY ; MID-HOLOCENE ; SEDIMENTS ; RECORD ; EVENT ; ROCK ; PLEISTOCENE ; SOILS
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/176330
作者单位1.CSIC, Inst Ciencies Terra Jaume Almera, E-08028 Barcelona, Spain;
2.Inst Geol & Minero Espana, Unidad Zaragoza, Zaragoza 50006, Spain;
3.Univ Zaragoza, Dept Ciencias Tierra, E-50009 Zaragoza, Spain;
4.Desert Res Inst, Div Earth & Ecosyst Sci, Reno, NV 89512 USA;
5.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA;
6.Univ Barcelona, Dept Estratig Paleontol & Geociencies Marines, GEOMODELS Res Inst, GGAC, E-08028 Barcelona, Spain;
7.CSIC, Inst Ciencies Terra Jaume Almera, GEOMODELS Res Inst, GGAC,Lab Paleomagnetisme CCiTUB CSIC, E-08028 Barcelona, Spain
推荐引用方式
GB/T 7714
Gomez-Paccard, M.,Larrasoana, J. C.,Sancho, C.,et al. Environmental response of a fragile, semiarid landscape (Bardenas Reales Natural Park, NE Spain) to Early Holocene climate variability: A paleo- and environmental-magnetic approach[J],2013,103:30-43.
APA Gomez-Paccard, M..,Larrasoana, J. C..,Sancho, C..,Munoz, A..,McDonald, E..,...&Beamud, E..(2013).Environmental response of a fragile, semiarid landscape (Bardenas Reales Natural Park, NE Spain) to Early Holocene climate variability: A paleo- and environmental-magnetic approach.CATENA,103,30-43.
MLA Gomez-Paccard, M.,et al."Environmental response of a fragile, semiarid landscape (Bardenas Reales Natural Park, NE Spain) to Early Holocene climate variability: A paleo- and environmental-magnetic approach".CATENA 103(2013):30-43.
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