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Ingakslugwat Hills

Campo vulcanico · United States · 190 m

The Ingakslugwat Hills volcanic field covers an area of more than 500 km2 and contains over 32 scoria cones and 8 larger craters, some of which are seen in this Planet Labs June 2019 satellite image monthly mosaic (N is at the top; image is approximately 40 km across).
The Ingakslugwat Hills volcanic field covers an area of more than 500 km2 and contains over 32 scoria cones and 8 larger craters, some of which are seen in this Planet Labs June 2019 satellite image monthly mosaic (N is at the top; image is approximately 40 km across). · Foto: Satellite image courtesy of Planet Labs Inc., 2019 (https://www.planet.com/). · Wikimedia Commons
Tipo
Campo vulcanico
Paese
United States
Regione
North America Volcanic Regions / Northern Alaska-Bering Sea Volcanic Province
Altitudine
190 m
Coordinate
61.430, -164.470
Ultima eruzione
Sconosciuto
Contesto tettonico
Intraplate / Continental crust (> 25 km)
Forma vulcanica
Cluster
Roccia principale
Basalt / Picro-Basalt
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 inglese

The 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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