Rockhound and Prospector's Bible: A Reference and Study Guide to Rocks, Minerals, Gemstones and Prospecting by Ettinger L.J

Author:Ettinger, L.J. [Ettinger, L.J.]
Language: eng
Format: epub
Tags: Minerals, Geologic Environments, Gemstones, Igneous, Rockhound, Metamorphic, Rocks, Geologist, L.J. Ettinger, Rock Classifications, Sedimentary, Prospector
Publisher: SO&SO Co LLC
Published: 2013-04-03T00:00:00+00:00

Bajada Placers

Bajada placers form in arid climates and are related to alluvial fans. Alluvial fans form at the base of a mountain range as the result of flash flood erosion and transportation of rock and mineral material. When the waters emerge from narrow canyons draining the mountain range, there is a sudden decrease in water velocity and the boulders, gravel and sand are deposited, building alluvial fans. Bajada placers may show surface enrichment by removal of lighter material by wind and sheet floods. Placer concentrations are usually erratic because of the wandering nature of the channelways.

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