K-Ar dating of the Cima volcanic field, eastern Mojave Desert, California; late Cenozoic volcanic history and landscape evolution.
Dohrenwend, John C; McFadden, Leslie D; Turrin, Brent D; Wells, Stephen G (1984) K-Ar dating of the Cima volcanic field, eastern Mojave Desert, California; late Cenozoic volcanic history and landscape evolution. Geology (Boulder). 12; 3, Pages 163-167. 1984.
| Authors | Dohrenwend, John C; McFadden, Leslie D; Turrin, Brent D; Wells, Stephen G |
|---|---|
| Year | 1984 |
| Title | K-Ar dating of the Cima volcanic field, eastern Mojave Desert, California; late Cenozoic volcanic history and landscape evolution. |
| Source | Geology (Boulder). 12; 3, Pages 163-167. 1984. |
| Publisher | Geological Society of America (GSA). Boulder, CO, United States. 1984. |
| Document type | Serial |
| ISSN | 0091-7613 |
| GeoRef | 1984-029708 |
| Keywords | absolute-age; age-; arid-environment; California-; Cenozoic-; dates-; degradation-; erosion-; evolution-; geochronology-; geomorphology-; horizon-differentiation; igneous-rocks; K-Ar; landform-evolution; lava-; lava-fields; Mojave-Desert; Neogene-; paleomagnetism-; pedogenesis-; Pleistocene-; Quaternary-; San-Bernardino-County-California; soils-; surveys-; Tertiary-; United-States; upper-Cenozoic; volcanic-features; volcanic-fields; volcanic-rocks; volcanism-; volcanology-; wind-transport |
Abstract
Thirty-four K-Ar ages, supporting paleomagnetic measurements. Three periods of volcanic activity: (1) 7.6 to 6.5, (2) 4.5 to 3.6 and (3) 1.0 to at least 0.015 m.y. ago. Long-term effects of pedogenesis and erosion on volcanic landforms in an arid environment. The most stable geomorphic surfaces in the field occur on flows between 0.25 and 0.75 m.y old. Younger flows are dominated by eolian aggradation and outcrop rubbling, and older flows are dominated by surface runoff and fluvial dissection. Progressive pedogenesis and a subsequent shift from infiltration to surface runoff is proposed to explain this temporal variation in land-surface stability.--Modified journal abstract.
34 samples from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| 1 | Basalt | |||
| 1A | Basalt | |||
| 1AR | Basalt | |||
| 2 | Basalt | |||
| 2A | Basalt | |||
| 3 | Basalt | |||
| 5 | Basalt | |||
| 6 | Basalt | |||
| 11 | Basalt | |||
| 12 | Basalt | |||
| 13 | Basalt | |||
| 14 | Basalt | |||
| 14R | Basalt | |||
| 16 | Basalt | |||
| 19 | Basalt | |||
| 20 | Basalt | |||
| 21 | Basalt | |||
| 24 | Basalt | |||
| 25 | Basalt | |||
| 26 | Basalt | |||
| 28 | Basalt | |||
| 29 | Basalt | |||
| 36 | Basalt | |||
| 37 | Basalt | |||
| 40 | Basalt | |||
| 41 | Basalt | |||
| 41R | Basalt | |||
| 42 | Basalt | |||
| 43 | Basalt | |||
| 51 | Basalt | |||
| 55 | Basalt | |||
| 56 | Basalt | |||
| 59 | Basalt | |||
| 62 | Basalt |