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Iskut-Unuk River Cones

Cono piroclastico · Canada · 1880 m

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. · Foto: Photo by Ben Edwards, 1997 (Dickinson College, Pennsylvania). · Wikimedia Commons
Tipo
Cono piroclastico
Paese
Canada
Regione
North America Volcanic Regions / Northern Cordilleran Volcanic Province
Altitudine
1880 m
Coordinate
56.567, -130.750
Ultima eruzione
1800
Contesto tettonico
Intraplate / Continental crust (> 25 km)
Forma vulcanica
Cluster
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

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.

Sintesi da Wikipedia

Riassunto in inglese

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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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
6830 BCE~6539 BCE · 1 eruzioni · VEI max. ?4792 BCE~4501 BCE · 1 eruzioni · VEI max. ?3628 BCE~3336 BCE · 1 eruzioni · VEI max. ?1881 BCE~1590 BCE · 1 eruzioni · VEI max. ?716 BCE~425 BCE · 1 eruzioni · VEI max. ?1322~1613 · 1 eruzioni · VEI max. ?1613~1904 · 2 eruzioni · VEI max. ?6830 BCE4792 BCE2463 BCE425 BCE1613

Cronologia dettagliata

  1. 1904VEI ?Stima geologica
    1904 – In corso
    Lava Fork
  2. 1800VEI ?Stima geologica
    1800 – In corso
    Lava Fork
  3. 1590 (±50 anni)VEI ?Stima geologica
    1590 – In corso
    Lava Fork
  4. 620 a.C. (±150 anni)VEI ?Stima geologica
    BCE 620 – In corso
    Iskut River
  5. 1830 a.C. (±300 anni)VEI ?Stima geologica
    BCE 1830 – In corso
    Iskut River
  6. 3450 a.C. (±150 anni)VEI ?Stima geologica
    BCE 3450 – In corso
    Iskut River
  7. 4700 a.C. (±300 anni)VEI ?Stima geologica
    BCE 4700 – In corso
    Iskut River
  8. 6830 a.C. (±150 anni)VEI ?Stima geologica
    BCE 6830 – In corso
    Iskut River

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