Skip to Main Content
Book Chapter

Upper Pleistocene glacial valley-junction sediments at Pias, Trevinca Mountains, NW Spain

By
Augusto Pérez Alberti
Augusto Pérez Alberti
Departamento de Xeografía. Universidade de Santiago de Compostela, Santjago de Compostela, Spain
Search for other works by this author on:
Marcos Valcárcel Díaz
Marcos Valcárcel Díaz
Departamento de Xeografía. Universidade de Santiago de Compostela, Santjago de Compostela, Spain
Search for other works by this author on:
I. Peter Martini
I. Peter Martini
School of Environmental Sciences, University of Guelph, Guelph, ON, Canada
Search for other works by this author on:
Vincenzo Pascucci
Vincenzo Pascucci
Dipartimento Scienze Botaniche, Ecologiche e Geologiche, Università di Sassari, Sassari, Italia
Search for other works by this author on:
Stefano Andreucci
Stefano Andreucci
Dipartimento Scienze Botaniche, Ecologiche e Geologiche, Università di Sassari, Sassari, Italia
Search for other works by this author on:
Published:
January 01, 2011

Abstract

Sediments at Pias (Galicia) provide evidence of Upper Pleistocene glacial activities at a valley junction in the north-western mountains of Spain. The sedimentary sequence consists of lower, predominately fine-grained lacustrine deposits with few lonestones, overlain by poorly sorted, sandy gravels interstratified with massive diamicton deposited during mid-Weichselian times (MIS 3) (marine isotope stage 3). The lacustrine sediments were deposited in a glacial valley temporarily dammed by a confluent glacier. The presence of active ice is suggested by massive diamicton layers best interpreted as till, rafted sediments in lacustrine deposits and deformation structures indicative of loading and kettle formation. Frozen ground conditions are suggested by a few involution-like structures. The Pias area contains one of the few western-Spain sedimentary records of Upper Pleistocene glaciation at relatively low latitude (about 42°N) and low altitude (less than 1000 m a.s.l.). A southern dip of the Polar front to 40–45°N latitudes, as occurred during Last Glacial Maximum, could have cut moisture to the northern Fennoscandinavian ice sheets. At the same time, however, sufficient precipitations would have persisted in north-western Spain to sustain extensive ice caps and their outlets to elevations as low as c. 900 m a.s.l.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

Geological Society Special Publication

Ice-Marginal and Periglacial Processes and Sediments

I. P. Martini
I. P. Martini
University of Guelph, Canada
Search for other works by this author on:
H. M. French
H. M. French
University of Guelph, Canada
Search for other works by this author on:
A. PéRez Alberti
A. PéRez Alberti
Universidade de Santiago de Compostela, Spain
Search for other works by this author on:
Geological Society of London
Volume
354
ISBN electronic:
9781862396029
Publication date:
January 01, 2011

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal