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Climatic implications of the Quaternary fluvial tufa record in the NE Iberian Peninsula over the last 500 ka

Published online by Cambridge University Press:  20 January 2017

Carlos Sancho ,
Concha Arenas ,
Marta Vázquez-Urbez ,
Gonzalo Pardo ,
María Victoria Lozano ,
José Luis Peña-Monné ,
John Hellstrom ,
José Eugenio Ortiz ,
María Cinta Osácar  and
Luis Auqué
...Show all authors
Carlos Sancho*
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
Concha Arenas
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
Marta Vázquez-Urbez
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
Gonzalo Pardo
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
María Victoria Lozano
Affiliation:
Departamento de Geografía y Ordenación del Territorio, Universidad de Zaragoza, Ciudad Escolar s/n, 44003 Teruel, Spain
José Luis Peña-Monné
Affiliation:
Departamento de Geografía y Ordenación del Territorio, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
John Hellstrom
Affiliation:
School of Earth Sciences, The University of Melbourne, VIC 3010, Melbourne, Australia
José Eugenio Ortiz
Affiliation:
Laboratorio de Estratigrafía Biomolecular, Escuela Técnica Superior de Ingenieros de Minas, Ríos Rosas 21, 28003 Madrid, Spain
María Cinta Osácar
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
Luis Auqué
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
Trinidad Torres
Affiliation:
Laboratorio de Estratigrafía Biomolecular, Escuela Técnica Superior de Ingenieros de Minas, Ríos Rosas 21, 28003 Madrid, Spain
*
*Corresponding author. Email Address: csancho@unizar.es
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Abstract

The drainage area of the Iberian Ranges (NE Spain) houses one of the most extensive Quaternary fluvial tufaceous records in Europe. In this study, tufa deposits in the Añamaza, Mesa, Piedra and Ebrón river valleys were mapped, stratigraphically described and chronologically referenced from U/Th disequilibrium series, amino acid racemization and radiocarbon methods. Tufa deposits accumulated in cascades, barrage-cascades and related damming areas developed in stepped fluvial systems. The maximum frequency of tufa deposition was identified at 120 ka (Marine Oxygen Isotope Stage [MIS] 5e), 102 ka (MIS 5c), 85 ka (~ MIS 5a) and 7 ka (MIS 1), probably under warmer and wetter conditions than today. Additional phases of tufa deposition appear at ~ 353 ka (~ end of MIS 11), 258–180 ka (MIS 7) and 171–154 ka (MIS 6). Although most tufa deposition episodes are clearly correlated with interstadial periods, the occurrence of tufa deposits during the penultimate glaciation (MIS 6) is remarkable, indicating that the onset of this stage was climatically favourable in the Iberian Peninsula. Biostatic conditions and the dynamics of karstic systems regulating tufa deposition seem to be sensitive to the precipitation regime, controlled by shifts in the position of North Atlantic atmospheric belts, and summer insolation, regulated by orbital forcing.

Keywords

Fluvial tufasDating techniquesQuaternary climateIberian Ranges
Type
Articles
Information
Quaternary Research , Volume 84 , Issue 3 , November 2015 , pp. 398 - 414
Copyright
University of Washington

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