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Uzon

Caldera · Russia · 1617 m

The Uzon and Geyzernaya calderas, containing Kamchatka's largest geothermal area, form a 7 x 18 km depression that formed during the mid-Pleistocene. Post-caldera activity was largely Pleistocene in age, although the Lake Dal'ny maar formed during the early Holocene. This view looks from the SW across the flat caldera floor, which contains numerous lakes, streams, and thermal areas. Sharp-peaked Kronotsky volcano and flat-topped Krasheninnikov volcano appear in the distance beyond the N caldera rim.
The Uzon and Geyzernaya calderas, containing Kamchatka's largest geothermal area, form a 7 x 18 km depression that formed during the mid-Pleistocene. Post-caldera activity was largely Pleistocene in age, although the Lake Dal'ny maar formed during the early Holocene. This view looks from the SW across the flat caldera floor, which contains numerous lakes, streams, and thermal areas. Sharp-peaked Kronotsky volcano and flat-topped Krasheninnikov volcano appear in the distance beyond the N caldera rim. · Foto: Photo by Dan Miller, 1990 (U.S. Geological Survey). · Wikimedia Commons
Tipo
Caldera
Paese
Russia
Regione
Pacifico nord-occidentale / Eastern Kamchatka Volcanic Arc
Altitudine
1617 m
Coordinate
54.489, 159.974
Ultima eruzione
200
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Caldera
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

The Uzon and Geysernaya calderas, containing Kamchatka's largest geothermal area, form a 7 x 18 km depression that originated during multiple mid-Pleistocene eruptions. Widespread ignimbrite deposits associated with caldera formation have a volume of 20-25 km3 (exclusive of airfall deposits) and cover an area of 1,700 km2. Post-caldera activity was largely Pleistocene in age and consisted of the extrusion of small silicic lava domes and flows and maar formation in the Geysernaya caldera. The Lake Dal'ny maar in the NE part of the 9 x 12 km western Uzon caldera is early Holocene in age, and several Holocene phreatic eruptions have been documented in the Geysernaya caldera. The extensive high-temperature hydrothermal system includes the many hot springs, mudpots, and geysers of the Valley of Geysers, a 4-km-long canyon on the SE margin of the depression. Hydrothermal explosions took place in the caldera in 1986 and 1989.

Sintesi da Wikipedia

Riassunto in inglese

Uzon is a 9 by 12 km volcanic caldera located in the eastern part of Kamchatka Peninsula, Russia. Together with the Geyzernaya caldera it hosts the largest geothermal field in the Kamchatka Peninsula. The calderas were formed in the mid-Pleistocene in several large eruptions that deposited 20–25 km3 of ignimbrite over a wide area. Lake Dalny fills a Holocene maar in the northeast of Uzon Caldera.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
5750 BCE~5552 BCE · 2 eruzioni · VEI max. ?1585 BCE~1387 BCE · 1 eruzioni · VEI max. ?2~200 · 1 eruzioni · VEI max. ?5750 BCE4362 BCE2775 BCE1387 BCE2

Cronologia dettagliata

  1. 200 (±300 anni)VEI ?Stima geologica
    200 – In corso
    Khloridnoe Lake
  2. 1550 a.C.VEI ?Stima geologica
    BCE 1550 – In corso
    Bannoe Lake
  3. 5700 a.C. (±50 anni)VEI ?Stima geologica
    BCE 5700 – In corso
    N part of caldera (Lake Dal'ny maar)
  4. 5750 a.C.VEI ?Stima geologica
    BCE 5750 – In corso

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.