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Luminescence dating of alluvial fans in intramontane basins of NW Argentina

By
R. A. J. Robinson
R. A. J. Robinson
School of Geography & Geosciences, University of St Andrews, St Andrews, Fife KY16 9AL, UK (e-mail: rajr@st-andrews.ac.uk)
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J. Q. G. Spencer
J. Q. G. Spencer
School of Geography & Geosciences, University of St Andrews, St Andrews, Fife KY16 9AL, UK (e-mail: rajr@st-andrews.ac.uk)
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M. R. Strecker
M. R. Strecker
Institut für Geowissenschaften, Universitat Potsdam, P.O. Box 601553, Potsdam, Germany
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A. Richter
A. Richter
Institut für Geowissenschaften, Universitat Potsdam, P.O. Box 601553, Potsdam, Germany
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R. N. Alonso
R. N. Alonso
Facultad de Ciencias Naturales-Geologia, Universidad Nacional de Salta, Salta, Argentina
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Published:
January 01, 2005

Abstract

Alluvial fans are sensitive recorders of both climatic change and tectonic activity. The ability to constrain the age of alluvial-fan sequences, individual sedimentary events and the rates of sediment accumulation are key for constraining which mechanisms most control their formation. Recent advances in optically stimulated luminescence (OSL) measurement and analysis have resulted in vast improvements in the dating technique and reliability of age determinations, particularly for OSL dating of quartz grains, and routine application to a wide variety of depositional environments is now possible. Here we apply OSL methods to date a variety of deposits within Late Pleistocene conglomeratic alluvial sequences in NW Argentina. The ages obtained range from 39 to 83 ka and were determined from debris-flow- and fluvial-dominated deposits and lacustrine sequences in intramontane basins bounded by tectonically active mountain ranges with as much as 2 km of relief. With careful choice of facies and sample collection, OSL techniques can be used to date Late Pleistocene, predominately matrix-supported, cobble–conglomerate alluvial deposits.

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Contents

Geological Society, London, Special Publications

Alluvial Fans: Geomorphology, Sedimentology, Dynamics

A. M. Harvey
A. M. Harvey
University of Liverpool, UK
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A. E. Mather
A. E. Mather
University of Plymouth, UK
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M. Stokes
M. Stokes
University of Plymouth, UK
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Geological Society of London
Volume
251
ISBN electronic:
9781862394995
Publication date:
January 01, 2005

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