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cinder cone description
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A cinder cone is a simple, steep-sided volcanic cone built from pyroclastic fragments (mainly scoria) thrown out of a single vent during moderately explosive eruptions.
Key points
- Formation: Gas-charged magma erupts explosively, fragmenting into molten droplets that solidify in the air as cinders (scoria) and fall back around the vent, accumulating into a cone.
- Composition: Typically basaltic to basaltic-andesitic; the fragments are vesicular (full of gas bubbles) and dark-colored.
- Shape and size: Steep slopes close to the angle of repose (~30–40°), usually 100–400 m high, with a bowl-shaped crater at the summit. Some reach up to 1 km in height in exceptional cases.
- Eruption style and lifespan: Often Strombolian-style—short-lived, intermittent explosions. Most cinder cones form during a single eruptive episode that lasts days to years (monogenetic).
- Location: Common in volcanic fields and on the flanks of larger volcanoes; occur worldwide.
- Hazards: Local: falling volcanic bombs, scoria fall, ash, small lava flows from breaches in the cone. Not typically associated with very large regional hazards, but can threaten nearby settlements and infrastructure.
- Lifecycle and erosion: After the eruptive phase the cone is subject to rapid erosion; many preserved cones are relatively young (thousands to tens of thousands of years).
- Examples: Parícutin (Mexico), Sunset Crater (Arizona), Wizard Island (Crater Lake, Oregon).
Contrast: Unlike broad, fluid-lava shield volcanoes or large layered stratovolcanoes, cinder cones are small, monogenetic, and built primarily of loose pyroclastic material rather than thick lava layers.
Key points
- Formation: Gas-charged magma erupts explosively, fragmenting into molten droplets that solidify in the air as cinders (scoria) and fall back around the vent, accumulating into a cone.
- Composition: Typically basaltic to basaltic-andesitic; the fragments are vesicular (full of gas bubbles) and dark-colored.
- Shape and size: Steep slopes close to the angle of repose (~30–40°), usually 100–400 m high, with a bowl-shaped crater at the summit. Some reach up to 1 km in height in exceptional cases.
- Eruption style and lifespan: Often Strombolian-style—short-lived, intermittent explosions. Most cinder cones form during a single eruptive episode that lasts days to years (monogenetic).
- Location: Common in volcanic fields and on the flanks of larger volcanoes; occur worldwide.
- Hazards: Local: falling volcanic bombs, scoria fall, ash, small lava flows from breaches in the cone. Not typically associated with very large regional hazards, but can threaten nearby settlements and infrastructure.
- Lifecycle and erosion: After the eruptive phase the cone is subject to rapid erosion; many preserved cones are relatively young (thousands to tens of thousands of years).
- Examples: Parícutin (Mexico), Sunset Crater (Arizona), Wizard Island (Crater Lake, Oregon).
Contrast: Unlike broad, fluid-lava shield volcanoes or large layered stratovolcanoes, cinder cones are small, monogenetic, and built primarily of loose pyroclastic material rather than thick lava layers.
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