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Mammoth Mountain

Duomo di 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
Tipo
Duomo di lava
Paese
United States
Regione
North America Volcanic Regions / Basin and Range Volcanic Province
Altitudine
3369 m
Coordinate
37.631, -119.032
Ultima eruzione
1260
Contesto tettonico
Rift zone / Continental crust (> 25 km)
Forma vulcanica
Minor
Roccia principale
Trachyte / Trachydacite
Sintesi geologica

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.

Sintesi da Wikipedia

Riassunto in inglese

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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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
6540 BCE~6280 BCE · 1 eruzioni · VEI max. 21000~1260 · 1 eruzioni · VEI max. ?6540 BCE4720 BCE2640 BCE820 BCE1000

Cronologia dettagliata

  1. 1260 (±40 anni)VEI ?Stima geologica
    1260 – In corso
    North flank of Mammoth Mountain
  2. 6540 a.C. (±90 anni)VEI 2Stima geologica
    BCE 6540 – In corso
    SSW of Mammoth Mtn (Red Cones)

Link esterni

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