The paleolake of La Larri (Pineta valley, Pyrenees): explanation in the framework of the last glacial maximum in the Pyrenees

A. Salazar-Rincón, María Pilar Mata-Campo, Maria Teresa Rico-Herrero, Blas Lorenzo Valero-Garcés, Belén Oliva-Urcia, P. Ibarra, F. M. Rubio, Grupo Horda

Abstract


The unique geological framework of the “los Llanos de La Larri” (Ordesa-Monte Perdido National Park) facilitated the genesis of a relevant juxtaglacial sedimentary record during the last glacial phase in the central Pyrenees. In this study we conducted a geomorphological and outcrop survey, an electric tomography study and the definition of the main sedimentological units by means of the study of 3 cores up to 17 m long. The combined study of surface and underground data has allowed us to define a paleolacustrine sedimentary sequence more than 40 m thick and the geometry and nature of the units of the infilling sequence. Radiocarbon dating indicate that the minimum age of this deposit is 35 ky (BP) at 17 m depth, and the infilling of the basin ends at 11 ky BP.

Keywords


paleolake, last glacial maximun, geomorphology, electric tomography, Central Pyrenees,



DOI: http://dx.doi.org/10.18172/cig.2001

© Universidad de La Rioja, 2013

ISSN 0211-6820

EISSN 1697-9540