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Heidarspordar

열극 분화구 · Iceland · 490m

The Laxarhraun lava field in the Heiðarspordar volcanic system covered much of the Lake Mývatn area and lava flowed down the Laxardalur canyon to the north coast. Numerous pseudocraters and rootless cones, some of which are seen here along the shore of the lake, formed as a result of secondary explosive activity when the lava flow encountered abundant groundwater. The massive 224 km2 flow, erupted about 2,000 years ago, forms all but the northern shoreline of the lake.
The Laxarhraun lava field in the Heiðarspordar volcanic system covered much of the Lake Mývatn area and lava flowed down the Laxardalur canyon to the north coast. Numerous pseudocraters and rootless cones, some of which are seen here along the shore of the lake, formed as a result of secondary explosive activity when the lava flow encountered abundant groundwater. The massive 224 km2 flow, erupted about 2,000 years ago, forms all but the northern shoreline of the lake. · 사진: Photo by Michael Ryan, 1984 (U.S. Geological Survey).
화산 유형
열극 분화구
국가
Iceland
지역
Atlantic Ocean Volcanic Regions / Iceland Neovolcanic Rift Volcanic Province
해발
490m
좌표
65.583, -16.817
마지막 분화
-300년
판구조 환경
Rift zone / Oceanic crust (< 15 km)
화산 지형
Cluster
지질학적 요약

The Heiðarsporðar volcanic system in the Northern Volcanic Zone is about 22 km long, consisting of a fissure swarm and a central volcano. It is embryonic, starting to develop in the marginal area of two adjacent fissure areas, Krafla and Fremrinámar, producing large-volume eruptions. No geothermal activity is present. Magma composition ranges from olivine-tholeiite through tholeiitic basalt and basaltic andesite to dacite. Characteristic activity consists of effusive basaltic eruptions and small predominantly effusive silicic eruptions. It has shown rather low activity in the Holocene but has produced substantial basaltic lava flows. Two eruptive periods have occurred in Holocene time separated by over 8,000 years. The last eruption took place about 2,200 years ago, producing a lava flow covering about 220 km2 and extending 60 km from source.

Wikipedia 요약

영어 요약

The Heiðarsporðar volcanic system is located in northeast Iceland near Lake Mývatn. It is the source of numerous formations present in and around the lake, particularly in the form of pseudocraters.

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분화 이력

요약 (VEI 시계열)
막대를 클릭하면 개별 분화가 표시됩니다
7850 BCE~7598 BCE · 1건 · 최고 VEI ?7598 BCE~7347 BCE · 1건 · 최고 VEI 07095 BCE~6843 BCE · 1건 · 최고 VEI 06340 BCE~6088 BCE · 1건 · 최고 VEI 05837 BCE~5585 BCE · 1건 · 최고 VEI 04075 BCE~3823 BCE · 1건 · 최고 VEI 0552 BCE~300 BCE · 1건 · 최고 VEI 27850 BCE6088 BCE4075 BCE2313 BCE552 BCE

상세 타임라인

  1. 기원전 300년VEI 2지질학적 추정
    BCE 300 ~ 진행 중
    Threngslaborgir-Ludentsborgir crater row
  2. 기원전 4050년VEI 0지질학적 추정
    BCE 4050 ~ 진행 중
    Ludent crater rows
  3. 기원전 5750년VEI 0지질학적 추정
    BCE 5750 ~ 진행 중
    Fjarborg
  4. 기원전 6150년VEI 0지질학적 추정
    BCE 6150 ~ 진행 중
    Drangagrundahraun
  5. 기원전 6950년VEI 0지질학적 추정
    BCE 6950 ~ 진행 중
    Hraunbunga
  6. 기원전 7400년 (±300년)VEI 0지질학적 추정
    BCE 7400 ~ 진행 중
    Heidarspordur
  7. 기원전 7850년VEI ?지질학적 추정
    BCE 7850 ~ 진행 중
    Ludent, Namafjall-Krofluhals

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