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Mammoth Mountain

용암돔 · United States · 3369m

Mammoth Mountain, a Pleistocene trachydacitic lava-dome complex constructed on the SW topographic rim of the Long Valley caldera between about 200,000 and 50,000 years ago, forms the broad peak on the horizon. The Red Cones (center and lower left) are part of series of about three dozen mafic cones surrounding Mammoth Mountain. The oxidized reddish scoria of the cone, which was formed during the early Holocene, is mantled at its base by light-colored pumice erupted from the Inyo Craters about 650 years ago.
Mammoth Mountain, a Pleistocene trachydacitic lava-dome complex constructed on the SW topographic rim of the Long Valley caldera between about 200,000 and 50,000 years ago, forms the broad peak on the horizon. The Red Cones (center and lower left) are part of series of about three dozen mafic cones surrounding Mammoth Mountain. The oxidized reddish scoria of the cone, which was formed during the early Holocene, is mantled at its base by light-colored pumice erupted from the Inyo Craters about 650 years ago. · 사진: Photo by Lee Siebert, 1998 (Smithsonian Institution) · Wikimedia Commons
화산 유형
용암돔
국가
United States
지역
North America Volcanic Regions / Basin and Range Volcanic Province
해발
3369m
좌표
37.631, -119.032
마지막 분화
1260년
판구조 환경
Rift zone / Continental crust (> 25 km)
화산 지형
Minor
주요 암석
Trachyte / Trachydacite
지질학적 요약

Mammoth Mountain, a trachydacitic lava-dome complex, lies on the SW topographic rim of Long Valley caldera. It is west of the structural rim of the caldera and considered to represent a magmatic system distinct from other nearby volcanic regions (Hildreth, 2004). The latest magmatic eruptions took place about 57,000 years ago. Mammoth Mountain is surrounded by at least 35 mafic vents that are part of the same magmatic system and include Red Cones, two closely spaced basaltic cinder cones SW of Mammoth Mountain and SE of Devils Postpile National Monument. The cones, whose name derives from colorful scoria deposits, are unglaciated and were radiocarbon dated at about 8,500 years ago. Phreatic eruptions, distinct from those at South Inyo Craters, took place about 700 years ago from vents on the north side of Mammoth Mountain. Recent unrest, including seismicity, gas emission, and tree kill, is thought to be related to dike intrusion in 1989.

Wikipedia 요약

영어 요약

Mammoth Mountain is a lava dome complex partially located in the town of Mammoth Lakes, California, within the Inyo National Forest of Madera and Mono counties. It is home to a large ski area primarily on the Mono County side.

Wikipedia · CC BY-SA · 전체 기사 보기 →

분화 이력

요약 (VEI 시계열)
막대를 클릭하면 개별 분화가 표시됩니다
6540 BCE~6280 BCE · 1건 · 최고 VEI 21000~1260 · 1건 · 최고 VEI ?6540 BCE4720 BCE2640 BCE820 BCE1000

상세 타임라인

  1. 1260년 (±40년)VEI ?지질학적 추정
    1260 ~ 진행 중
    North flank of Mammoth Mountain
  2. 기원전 6540년 (±90년)VEI 2지질학적 추정
    BCE 6540 ~ 진행 중
    SSW of Mammoth Mtn (Red Cones)

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