Stati Uniti · Campo vulcanico
Ingakslugwat Hills
- Tipo
- Campo vulcanico
- Altitudine
- 190 m
- Ultima eruzione
- Sconosciuto
- Tipo
- Campo vulcanico
- Paese
- Stati Uniti
- Regione
- Nord America / Northern Alaska-Bering Sea Volcanic Province
- Altitudine
- 190 m
- Coordinate
- 61.430, -164.470
- Ultima eruzione
- Sconosciuto
- Contesto tettonico
- Intraplacca / Crosta continentale (> 25 km)
- Forma vulcanica
- Gruppo vulcanico
- Roccia principale
- Basalto / Picrobasalto
Sintesi geologica
The Ingakslugwat Hills consist of at least 32 small cinder cones and eight larger craters covering more than 500 km2 in the Yukon-Kuskokwin delta area of SW Alaska. Numerous small spatter cones and cinder cones range from 8 to 190 m in height; many are concentrated in the NW side of the volcanic field. The latest activity was considered to have occurred during the Holocene (Moll-Stalcup, in Wood and Kienle, 1990). One low cone containing a 400-m-wide lake may be a maar. This dominantly alkali olivine basaltic field also contains basanitic and nephelinitic rocks, some with inclusions of lherzolite and layered gabbro.
Sintesi da Wikipedia
Riassunto in ingleseThe Ingakslugwat Hills volcanic field is in the Yukon–Kuskokwim Delta in western Alaska. It contains eight large craters and about thirty small pyroclastic cones in an area of some 500 km2. The field contains unusual so-called "Ingakslugwat volcanoes", volcanic ridges up to 7 kilometres (4.3 mi) long and 400 metres (1,300 ft) high which are formed by pyroclastic material. They most likely formed by the interaction of permafrost with magma, seeing as they have a hydrovolcanic nature despite being high above the water table.
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