United States · Stratovolcano
Mount Bachelor
Bachelor
- Type
- Stratovolcano
- Elevation
- 2763m
- Last eruption
- -5800
- Type
- Stratovolcano
- Country
- United States
- Region
- North America / High Cascades Volcanic Arc
- Elevation
- 2763m
- Coordinates
- 43.979, -121.688
- Last eruption
- -5800
- Tectonic setting
- Subduction zone / Continental crust (> 25 km)
- Landform
- Composite
- Major rock type
- Andesite / Basaltic andesite
Geological summary
This volcanic system extends from Mount Bachelor on the N to Lookout Mountain about 20 km S, with a chain of scoria cones and small shield volcanoes between and additional volcanic features to the E. The basaltic andesite and basaltic volcanoes formed during four eruptive periods dating back to about 18,000-15,000 years before present (BP). Construction of the main scoria cone chain was completed by about 12,000 years BP, and Bachelor (formerly known as Bachelor Butte) is one of its youngest features. The latest activity produced lava flows on the E side of Sparks Lake from scoria cones on the NNE flank of Bachelor, and lava flows from Egan scoria cone on the N flank that slightly preceded the eruption of the Mazama ash from Crater Lake about 7,000-8,500 years ago.
From Wikipedia
Mount Bachelor, formerly named Bachelor Butte, is a dormant stratovolcano atop a shield volcano in the Cascade Volcanic Arc and the Cascade Range of central Oregon, United States. Named Mount Bachelor because it stands apart from the nearby Three Sisters, it lies in the eastern segment of the central portion of the High Cascades, the eastern segment of the Cascade Range. The volcano lies at the northern end of the 15-mile (24 km) long Mount Bachelor Volcanic Chain, which underwent four major eruptive episodes during the Pleistocene and the Holocene. The United States Geological Survey considers Mount Bachelor a moderate threat, but Bachelor poses little threat of becoming an active volcano in the near future. It remains unclear whether the volcano is extinct or just inactive.
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Eruption history
1 recordedGlossaryDetailed timeline
- 5800 BCE (±750 yrs)VEI ?Geological estimate5800 BCE – end unknownNorth flank (Egan cone)
Nearby volcanoes
External links
⚠ For reference only. Not for emergency response.