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Iskut-Unuk River Cones

화쇄구 · 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. · 사진: Photo by Ben Edwards, 1997 (Dickinson College, Pennsylvania). · Wikimedia Commons
화산 유형
화쇄구
국가
Canada
지역
North America Volcanic Regions / Northern Cordilleran Volcanic Province
해발
1880m
좌표
56.567, -130.750
마지막 분화
1800년
판구조 환경
Intraplate / Continental crust (> 25 km)
화산 지형
Cluster
주요 암석
Basalt / Picro-Basalt
지질학적 요약

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 요약

영어 요약

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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분화 이력

요약 (VEI 시계열)
막대를 클릭하면 개별 분화가 표시됩니다
6830 BCE~6539 BCE · 1건 · 최고 VEI ?4792 BCE~4501 BCE · 1건 · 최고 VEI ?3628 BCE~3336 BCE · 1건 · 최고 VEI ?1881 BCE~1590 BCE · 1건 · 최고 VEI ?716 BCE~425 BCE · 1건 · 최고 VEI ?1322~1613 · 1건 · 최고 VEI ?1613~1904 · 2건 · 최고 VEI ?6830 BCE4792 BCE2463 BCE425 BCE1613

상세 타임라인

  1. 1904년VEI ?지질학적 추정
    1904 ~ 진행 중
    Lava Fork
  2. 1800년VEI ?지질학적 추정
    1800 ~ 진행 중
    Lava Fork
  3. 1590년 (±50년)VEI ?지질학적 추정
    1590 ~ 진행 중
    Lava Fork
  4. 기원전 620년 (±150년)VEI ?지질학적 추정
    BCE 620 ~ 진행 중
    Iskut River
  5. 기원전 1830년 (±300년)VEI ?지질학적 추정
    BCE 1830 ~ 진행 중
    Iskut River
  6. 기원전 3450년 (±150년)VEI ?지질학적 추정
    BCE 3450 ~ 진행 중
    Iskut River
  7. 기원전 4700년 (±300년)VEI ?지질학적 추정
    BCE 4700 ~ 진행 중
    Iskut River
  8. 기원전 6830년 (±150년)VEI ?지질학적 추정
    BCE 6830 ~ 진행 중
    Iskut River

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