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Heidarspordar

Rekahan erupsi · 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).
Tipe
Rekahan erupsi
Negara
Iceland
Wilayah
Atlantic Ocean Volcanic Regions / Iceland Neovolcanic Rift Volcanic Province
Ketinggian
490 m
Koordinat
65.583, -16.817
Letusan terakhir
-300
Kondisi tektonik
Rift zone / Oceanic crust (< 15 km)
Bentuk lahan
Cluster
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
7850 BCE~7598 BCE · 1 letusan · VEI maks. ?7598 BCE~7347 BCE · 1 letusan · VEI maks. 07095 BCE~6843 BCE · 1 letusan · VEI maks. 06340 BCE~6088 BCE · 1 letusan · VEI maks. 05837 BCE~5585 BCE · 1 letusan · VEI maks. 04075 BCE~3823 BCE · 1 letusan · VEI maks. 0552 BCE~300 BCE · 1 letusan · VEI maks. 27850 BCE6088 BCE4075 BCE2313 BCE552 BCE

Garis waktu rinci

  1. 300 SMVEI 2Perkiraan geologi
    BCE 300 – Berlangsung
    Threngslaborgir-Ludentsborgir crater row
  2. 4050 SMVEI 0Perkiraan geologi
    BCE 4050 – Berlangsung
    Ludent crater rows
  3. 5750 SMVEI 0Perkiraan geologi
    BCE 5750 – Berlangsung
    Fjarborg
  4. 6150 SMVEI 0Perkiraan geologi
    BCE 6150 – Berlangsung
    Drangagrundahraun
  5. 6950 SMVEI 0Perkiraan geologi
    BCE 6950 – Berlangsung
    Hraunbunga
  6. 7400 SM (±300 tahun)VEI 0Perkiraan geologi
    BCE 7400 – Berlangsung
    Heidarspordur
  7. 7850 SMVEI ?Perkiraan geologi
    BCE 7850 – Berlangsung
    Ludent, Namafjall-Krofluhals

Tautan eksternal

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