Prestahnúkur
Prestahnukur
Frattura eruttiva · Iceland · 1385 m
- Tipo
- Frattura eruttiva
- Paese
- Iceland
- Regione
- Atlantic Ocean Volcanic Regions / Iceland Neovolcanic Rift Volcanic Province
- Altitudine
- 1385 m
- Coordinate
- 64.583, -20.666
- Ultima eruzione
- -3350
- Contesto tettonico
- Rift zone / Oceanic crust (< 15 km)
- Forma vulcanica
- Cluster
- Roccia principale
- Basalt / Picro-Basalt
Sintesi geologica
The Prestahnúkur volcanic system is located on the W side of the Langjökull icecap at the west margin of the Western Volcanic Zone, and overlaps with the Hengill volcanic system north of Lake Þingvallavatn. It is about 90 km long and 15 km wide, with a subglacially erupted rhyolite peak and associated rift zones to the N and SW that have erupted during the Holocene. A large part of the volcanic system is underlain by early to mid Pleistocene plateau basalts. Olivine tholeiite basalt lava shields have erupted during the Holocene.
Sintesi da Wikipedia
Riassunto in ingleseSkjaldbreiður is an Icelandic lava shield formed in a huge and quite protracted eruption series from about roughly 9,500 years ago. The extensive lava fields which were produced by this eruption, flowed southwards, and formed the basin of Þingvallavatn, Iceland's largest lake, and Þingvellir, the "Parliament Plains" where the Icelandic national assembly, the Alþing was founded in 930.
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Storia delle eruzioni
Cronologia dettagliata
- 3350 a.C.VEI 0Stima geologicaBCE 3350 – In corsoSköflungur
- 6950 a.C.VEI 0Stima geologicaBCE 6950 – In corsoGeitlandshraun II
- 7550 a.C. (±500 anni)VEI 0Stima geologicaBCE 7550 – In corsoSkjaldbreidur
Link esterni
⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.