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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 34 (1964)No. 2. (June), Pages 395-400

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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