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タカヘ山

Takahe

楯状火山 · Antarctica · 3460m

This aerial view looks northeast across the trachytic shield volcano Mount Takahe, with an ice-filled 8-km-diameter caldera at the summit. The approximately 30-km-wide edifice rises about 2,000 m above the surrounding ice sheet. Eruption deposits indicate both subaqueous and subaerial eruptions, and include lavas and tephra. Möll Spur (right of center) is a prominent steep ridge of lava produced in two sequences at about 34 and 17 ka. The most recent eruption occurred around 5.6 ± 0.8 ka, producing widespread tephra distribution across West Antarctica.
This aerial view looks northeast across the trachytic shield volcano Mount Takahe, with an ice-filled 8-km-diameter caldera at the summit. The approximately 30-km-wide edifice rises about 2,000 m above the surrounding ice sheet. Eruption deposits indicate both subaqueous and subaerial eruptions, and include lavas and tephra. Möll Spur (right of center) is a prominent steep ridge of lava produced in two sequences at about 34 and 17 ka. The most recent eruption occurred around 5.6 ± 0.8 ka, producing widespread tephra distribution across West Antarctica. · 写真: U. S. Navy photo TMA 1718 F33 022. · Wikimedia Commons
タイプ
楯状火山
国
Antarctica
地域
南極・スコシア / Western Antarctica Volcanic Province
標高
3460m
座標
-76.280, -112.080
最終噴火
-5550年
テクトニクス環境
Intraplate / Continental crust (> 25 km)
火山地形
Shield
主要岩石
Trachyte / Trachydacite
地質学的概要

Mount Takahe is an isolated shield volcano in eastern Marie Byrd Land with an 8-km-wide summit caldera. The massive 780 km3 volcano displays a conical, youthful morphology, and the oldest dated rocks are only 310,000 years old. Three samples were too young to date by Potassium-Argon, and some tephra layers younger than 30,000 years in the Byrd Station ice core are thought to have originated from Takahe. Two early Holocene phreatomagmatic tephra layers in the Antarctic ice core were attributed to Takahe (Palais et al., 1988). The latest stage of activity constructed cinder cones on the upper southern flanks and tuff cones and cinder cones on the lower SW and NE flanks.

Wikipedia の要約

英語版の要約

Mount Takahe is a 3,460-metre-high (11,350 ft) snow-covered shield volcano in Marie Byrd Land, Antarctica, 200 kilometres (120 mi) from the Amundsen Sea. It is a c. 30-kilometre-wide (19 mi) mountain with parasitic vents and a caldera up to 8 kilometres (5 mi) wide. Most of the volcano is formed by trachytic lava flows, but hyaloclastite is also found. Snow, ice, and glaciers cover most of Mount Takahe. With a volume of 780 km3 (200 mi3), it is a massive volcano; the parts of the edifice that are buried underneath the West Antarctic Ice Sheet are probably even larger. It is part of the West Antarctic Rift System along with 18 other known volcanoes.

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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
7050 BCE~6900 BCE · 1件 · 最大 VEI ?6300 BCE~6150 BCE · 1件 · 最大 VEI ?5700 BCE~5550 BCE · 1件 · 最大 VEI ?7050 BCE6750 BCE6300 BCE6000 BCE5700 BCE

詳細タイムライン

  1. 紀元前 5550年VEI ?地質学的推定
    BCE 5550 ~ 進行中
  2. 紀元前 6250年 (±5400年)VEI ?地質学的推定
    BCE 6250 ~ 進行中
  3. 紀元前 7050年VEI ?地質学的推定
    BCE 7050 ~ 進行中

外部リンク

⚠ 参考情報です。緊急対応には使用しないでください。