Skip to Main Content
Book Chapter

Differential effects of base-level, tectonic setting and climatic change on Quaternary alluvial fans in the northern Great Basin, Nevada, USA

By
Adrian M. Harvey
Adrian M. Harvey
Department of Geography, University of Liverpool, PO Box 147, Liverpool L69 3BX, UK (e-mail: amharvey@liv.ac.uk)
Search for other works by this author on:
Published:
January 01, 2005

Abstract

Mountain-front alluvial fans in the northern Great Basin were affected by interactions between the tectonic setting, late Quaternary climatic changes and climatically induced base-level changes through fluctuations in pluvial lake levels. Four fan groups were studied on the margins of and near pluvial Lake Lahontan with varying geology and tectonic settings. All fans were affected by climatically led variations in sediment supply, but only those on steep mountain fronts adjacent to deep lakes were affected by base-level changes during lake desiccation.

Relationships between fan segments and dated lake shorelines, augmented by soil and desert pavement characteristics, have enabled fan segments older and younger than the lake highstands to be identified. Major periods of fan aggradation occurred prior to the last glacial maximum and during the Holocene, with little or no fan deposition occurring during and after the last glacial maximum, at the time of high lake levels. The interactions between tectonics, climate and base-level change have produced distinctive fan geometric relationships between older and younger fan segments, also expressed in the morphometric properties of the fans. Tectonics primarily influence the fan setting, particularly the accommodation space, and interact with sediment supply rates partly related to source-area geology. The climatic signal is present in all four groups of fans, but is modified locally by a base-level signal only where deep pluvial lakes abutted to relatively high levels on fans on relatively steep mountain fronts.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Alluvial Fans: Geomorphology, Sedimentology, Dynamics

A. M. Harvey
A. M. Harvey
University of Liverpool, UK
Search for other works by this author on:
A. E. Mather
A. E. Mather
University of Plymouth, UK
Search for other works by this author on:
M. Stokes
M. Stokes
University of Plymouth, UK
Search for other works by this author on:
Geological Society of London
Volume
251
ISBN electronic:
9781862394995
Publication date:
January 01, 2005

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