| Pipkin / Malpais Crater | |
|---|---|
| Geology | |
| Mountain type | Cinder Cone |
| Volcanic arc | Lavic Lake volcanic field |
| Last eruption | c. 600,000 years BP |
Pipkin (also known as Malpais Crater) is a volcano in California, with activity during the Quaternary. The surface of erupted lava flows is weathered, and argon-argon dating and potassium-argon dating has yielded ages of 770,000 ± 40,000 and c. 600,000 years before present, respectively.
The volcano lies in the Rodman Mountains. The 300 feet (91 m) high and 2,000 feet (610 m) wide Pipkin cinder cone probably erupted the lava flows which extend to its north and form a lava flow field which has the appearance of a mesa. The cone itself consists of lava bombs and scoria with red and black colours. Lava flows from the vent propagated through Kane Wash and into the Mojave River valley; it is possible that the lava diverted part of the wash into neighbouring Sheep Springs Wash.
The cone is the site of a quarry. Pipkin was mined since the 1950s for its ash.
References
- Bezore 1997, p. 41.
- Oskin et al. 2007, p. 4.
- Oskin et al. 2007, p. 6.
- ^ Oskin et al. 2007, p. 3.
- ^ Bezore 1997, p. 37.
- Oskin et al. 2007, p. 5.
- Bezore 1997, p. 11.
- Oskin et al. 2007, p. 10.
Sources
- Bezore, Stephen B. (1997). "Mineral land classification of a part of southwestern San Bernardino County: the Barstow-Newberry Springs area, California" (PDF). California Department of Conservation. Retrieved 16 March 2018.
- Oskin, Michael; Perg, Lesley; Blumentritt, Dylan; Mukhopadhyay, Sujoy; Iriondo, Alexander (1 March 2007). "Slip rate of the Calico fault: Implications for geologic versus geodetic rate discrepancy in the Eastern California Shear Zone". Journal of Geophysical Research: Solid Earth. 112 (B3): B03402. doi:10.1029/2006JB004451. ISSN 2156-2202.
34°41′12″N 116°37′12″W / 34.68667°N 116.62000°W / 34.68667; -116.62000
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