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イスクット‐ウヌク川丘群

Iskut-Unuk River Cones

火砕丘 · Canada · 1880m

Shallow ponds are seen across the surface of valley-filling lava flows of the Iskut-Unuk volcanic field. The flows traveled south 5 km where they crossed the border into Alaska and dammed the Blue River, forming several small lakes and traveling a total of approximately 22 km. The Iskut-Unuk River Cone Group consists of eight small basaltic centers at the southern end of the Stikine volcanic belt that range in age from about 70,000 to only a few hundred years old and form one of the youngest volcanic fields in Canada.
Shallow ponds are seen across the surface of valley-filling lava flows of the Iskut-Unuk volcanic field. The flows traveled south 5 km where they crossed the border into Alaska and dammed the Blue River, forming several small lakes and traveling a total of approximately 22 km. The Iskut-Unuk River Cone Group consists of eight small basaltic centers at the southern end of the Stikine volcanic belt that range in age from about 70,000 to only a few hundred years old and form one of the youngest volcanic fields in Canada. · 写真: Photo by Ben Edwards, 1997 (Dickinson College, Pennsylvania). · Wikimedia Commons
タイプ
火砕丘
国
Canada
地域
North America Volcanic Regions / Northern Cordilleran Volcanic Province
標高
1880m
座標
56.567, -130.750
最終噴火
1800年
テクトニクス環境
Intraplate / Continental crust (> 25 km)
火山地形
Cluster
主要岩石
Basalt / Picro-Basalt
地質学的概要

Eight small basaltic centers at the southern end of the Stikine volcanic belt near the Alaska border comprise the Iskut-Unuk River Cones group. Lava flows date back 70,000 years, but the subaerial vents produced cinder cones and lava flows that were probably all active between about 9,000 and a few hundred years ago. Five of the centers produced lava flows that traveled up to ~20 km down the Iskut and Unuk River valleys and their tributaries. The three remaining centers are products of ice-contact volcanism that formed pillow lava, hyaloclastite breccias, and scoria. The flows are similar in mineralogy and contain abundant crustal xenoliths. Vents in the Iskut River Canyon area produced at least 10 lava flows, and the Lava Fork vents at least three lava flows, the latest of which erupted within the past few hundred years.

Wikipedia の要約

英語版の要約

The Iskut volcanic field is a group of volcanoes and lava flows on and adjacent to the Alaska–British Columbia border in the Boundary Ranges of the Coast Mountains. All the volcanoes in this volcanic field are situated in British Columbia along the Iskut and Unuk rivers and their tributaries, with lava flows having reached Alaska. The oldest volcanoes in the Iskut volcanic field are Little Bear Mountain and Hoodoo Mountain, which are 146,000 and 85,000 years old, respectively. Younger volcanic centres include Second Canyon, King Creek, Tom MacKay Creek, Snippaker Creek, Iskut Canyon, Cone Glacier, Cinder Mountain and Lava Fork, all of which formed in the last 70,000 years. All of the volcanoes are mafic in composition except for Hoodoo Mountain which consists of peralkaline rocks. The latest volcanic eruption took place from the Lava Fork volcano in 1800, although an uncertain 1904 eruption is also attributed to this volcano.

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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
6830 BCE~6539 BCE · 1件 · 最大 VEI ?4792 BCE~4501 BCE · 1件 · 最大 VEI ?3628 BCE~3336 BCE · 1件 · 最大 VEI ?1881 BCE~1590 BCE · 1件 · 最大 VEI ?716 BCE~425 BCE · 1件 · 最大 VEI ?1322~1613 · 1件 · 最大 VEI ?1613~1904 · 2件 · 最大 VEI ?6830 BCE4792 BCE2463 BCE425 BCE1613

詳細タイムライン

  1. 1904年VEI ?地質学的推定
    1904 ~ 進行中
    Lava Fork
  2. 1800年VEI ?地質学的推定
    1800 ~ 進行中
    Lava Fork
  3. 1590年 (±50年)VEI ?地質学的推定
    1590 ~ 進行中
    Lava Fork
  4. 紀元前 620年 (±150年)VEI ?地質学的推定
    BCE 620 ~ 進行中
    Iskut River
  5. 紀元前 1830年 (±300年)VEI ?地質学的推定
    BCE 1830 ~ 進行中
    Iskut River
  6. 紀元前 3450年 (±150年)VEI ?地質学的推定
    BCE 3450 ~ 進行中
    Iskut River
  7. 紀元前 4700年 (±300年)VEI ?地質学的推定
    BCE 4700 ~ 進行中
    Iskut River
  8. 紀元前 6830年 (±150年)VEI ?地質学的推定
    BCE 6830 ~ 進行中
    Iskut River

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。