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Climatic controls on alluvial-fan activity, Coastal Cordillera, northern Chile

By
Adrian J. Hartley
Adrian J. Hartley
1
Department of Geology & Petroleum Geology, Meston Building, King's College, University of Aberdeen, Aberdeen AB9 2UE, UK
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Anne E. Mather
Anne E. Mather
2
School of Geography, University of Plymouth, Plymouth PL4 8AA, UK
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Elizabeth Jolley
Elizabeth Jolley
3
BP Exploration Co. of Trinidad & Tobago, 5–5a Queens Park West, Port of Spain, Trinidad, West Indies
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Peter Turner
Peter Turner
4
School of Earth Sciences, University of Birmingham, Birmingham B15 2TT, UK
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Published:
January 01, 2005

Abstract

A description of the distribution, drainage basin characteristics, surface morphology, depositional process and age of 64 alluvial fan systems from both flanks of the hyper-arid Coastal Cordillera of northern Chile between 22°15′S and 23°40′S is presented. The coastal fans on the western flank of the Coastal Cordillera are dominated by debris-flow deposits fed from steep catchments. Two drainage basin types are recognized: type A drainage basins are small (10–30 km2) and do not cut back beyond the main coastal watershed; and type B drainage basins are large (up to 400 km2) and cut inland beyond the coastal watershed. The western Central Depression fans on the eastern flank of the Coastal Cordillera are characterized by sheetflood deposition fed from relatively shallow catchments in small drainage basins (10–50 km2). The surface morphology, sedimentation rates, a luminescence date and regional cosmogenic radionucleide data suggest that these fans have been inactive for at least the last 230 000 years and probably for much of the Neogene.

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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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