Eruptive styles and inferences about plumbing systems at Hidden Cone and Little Black Peak scoria cone volcanoes (Nevada,U.S.A.) |
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| Authors: | Greg A Valentine Gordon N Keating |
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| Institution: | (1) Earth and Environmental Sciences Division, Los Alamos National Laboratory, Mail Stop D462, Los Alamos, NM 87545, USA |
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| Abstract: | We describe two small scoria cone volcanoes, Hidden Cone and Little Black Peak (ages between ~320–390 ka), in the Southwestern
Nevada Volcanic Field and discuss their eruption mechanisms and inferences about their plumbing systems. Cone-forming pyroclastic
deposits are consistent with eruptive styles ranging from Strombolian to violent Strombolian, and lavas emanated from near
the bases of the cones. The volcanoes are monogenetic (rather than polycyclic, as allowed by previous geomorphic interpretations).
Vents at each volcano appear to coincide with pre-existing normal faults, consistent with observations at older, deeply eroded
volcanoes in the region. The existence of these two volcanoes on a topographically high area (particularly Hidden Cone) provides
evidence for short feeder dike lengths (~500 m at the surface). We infer that this short length reflects the small length
scale of the mantle source region that was tapped to feed each volcano.
Editorial responsibility: J Stix |
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| Keywords: | Scoria cone Dike Southwest Nevada Volcanic Field |
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