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Sedimentation of an Alluvial Fan in Southern Nevada
Brian J. Bluck
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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