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マンモス山

Mammoth Mountain

溶岩ドーム · 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. · 写真: Photo by Lee Siebert, 1998 (Smithsonian Institution) · Wikimedia Commons
タイプ
溶岩ドーム
国
United States
地域
North America Volcanic Regions / Basin and Range Volcanic Province
標高
3369m
座標
37.631, -119.032
最終噴火
1260年
テクトニクス環境
Rift zone / Continental crust (> 25 km)
火山地形
Minor
主要岩石
Trachyte / Trachydacite
地質学的概要

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 の要約

英語版の要約

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 · 記事全文を読む →

噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
6540 BCE~6280 BCE · 1件 · 最大 VEI 21000~1260 · 1件 · 最大 VEI ?6540 BCE4720 BCE2640 BCE820 BCE1000

詳細タイムライン

  1. 1260年 (±40年)VEI ?地質学的推定
    1260 ~ 進行中
    North flank of Mammoth Mountain
  2. 紀元前 6540年 (±90年)VEI 2地質学的推定
    BCE 6540 ~ 進行中
    SSW of Mammoth Mtn (Red Cones)

外部リンク

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