Drainage networks on the accretionary eolian mantles of 11 K-Ar-dated lava flows in Cima volcanic field and 8 K-Ar-dated flows in the Lunar Crater volcanic field show several related and progressive changes with flow age. After accumulation of an eolian mantle (requiring 0. 1 to 0. 2 m. y. ), master drainages extend to all parts of a flow. During this period of elongation, which lasts for minus 0. 2 to 0. 3 m. y. , drainage density (D) and link, frequency (F) increase rapidly whereas the value of Shreve's kappa ( kappa ) declines. After minus 0. 4 m. y. , elaboration replaces elongation as the principal mode of network extension and remains predominant throughout the remainder of the 1. 1-m. y. period of record. Elaboration proceeds mainly by the formation of short tributaries along existing streams and by the creation of short streams along flow margins.
|Original language||English (US)|
|Number of pages||9|
|Journal||Bulletin of the Geological Society of America|
|State||Published - 1987|
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