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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Sedimentation of an Alluvial Fan in Southern Nevada
Brian J. Bluck
ABSTRACT
The study of an alluvial fan sequence in southern Nevada consisting of an earlier mudflow and a younger stream deposit reveals that particles of both these phases have an exponential decline in size away from the source area. The mudflow is characterized by a steeper curve of particle size decline and also has a lower correlation coefficient than that of the stream deposit. The stream deposit is largely the result of reworking of the older mudflow, but it has a consistently lower particle size. This is caused by weathering and splitting of the particles. In the stream deposit a general increase in the rod- and disc-shaped pebbles downstream is due to the effects of transportation in traction and suspension respectively.
Fan head entrenchment is the result of a change from mudflow to stream conditions on the alluvial fan and the development of a new fan profile.
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