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Heidarspordar

Frattura eruttiva · Iceland · 490 m

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. · Foto: Photo by Michael Ryan, 1984 (U.S. Geological Survey).
Tipo
Frattura eruttiva
Paese
Iceland
Regione
Atlantic Ocean Volcanic Regions / Iceland Neovolcanic Rift Volcanic Province
Altitudine
490 m
Coordinate
65.583, -16.817
Ultima eruzione
-300
Contesto tettonico
Rift zone / Oceanic crust (< 15 km)
Forma vulcanica
Cluster
Sintesi geologica

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.

Sintesi da Wikipedia

Riassunto in inglese

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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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
7850 BCE~7598 BCE · 1 eruzioni · VEI max. ?7598 BCE~7347 BCE · 1 eruzioni · VEI max. 07095 BCE~6843 BCE · 1 eruzioni · VEI max. 06340 BCE~6088 BCE · 1 eruzioni · VEI max. 05837 BCE~5585 BCE · 1 eruzioni · VEI max. 04075 BCE~3823 BCE · 1 eruzioni · VEI max. 0552 BCE~300 BCE · 1 eruzioni · VEI max. 27850 BCE6088 BCE4075 BCE2313 BCE552 BCE

Cronologia dettagliata

  1. 300 a.C.VEI 2Stima geologica
    BCE 300 – In corso
    Threngslaborgir-Ludentsborgir crater row
  2. 4050 a.C.VEI 0Stima geologica
    BCE 4050 – In corso
    Ludent crater rows
  3. 5750 a.C.VEI 0Stima geologica
    BCE 5750 – In corso
    Fjarborg
  4. 6150 a.C.VEI 0Stima geologica
    BCE 6150 – In corso
    Drangagrundahraun
  5. 6950 a.C.VEI 0Stima geologica
    BCE 6950 – In corso
    Hraunbunga
  6. 7400 a.C. (±300 anni)VEI 0Stima geologica
    BCE 7400 – In corso
    Heidarspordur
  7. 7850 a.C.VEI ?Stima geologica
    BCE 7850 – In corso
    Ludent, Namafjall-Krofluhals

Link esterni

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