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Mammoth Mountain

Kubah lava · United States · 3369 m

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. · Foto: Photo by Lee Siebert, 1998 (Smithsonian Institution) · Wikimedia Commons
Tipe
Kubah lava
Negara
United States
Wilayah
North America Volcanic Regions / Basin and Range Volcanic Province
Ketinggian
3369 m
Koordinat
37.631, -119.032
Letusan terakhir
1260
Kondisi tektonik
Rift zone / Continental crust (> 25 km)
Bentuk lahan
Minor
Batuan utama
Trachyte / Trachydacite
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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.

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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
6540 BCE~6280 BCE · 1 letusan · VEI maks. 21000~1260 · 1 letusan · VEI maks. ?6540 BCE4720 BCE2640 BCE820 BCE1000

Garis waktu rinci

  1. 1260 (±40 tahun)VEI ?Perkiraan geologi
    1260 – Berlangsung
    North flank of Mammoth Mountain
  2. 6540 SM (±90 tahun)VEI 2Perkiraan geologi
    BCE 6540 – Berlangsung
    SSW of Mammoth Mtn (Red Cones)

Tautan eksternal

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