アメリカ合衆国 · 火山原
Ingakslugwat Hills
- タイプ
- 火山原
- 標高
- 190m
- 最終噴火
- 不明
- タイプ
- 火山原
- 国
- アメリカ合衆国
- 地域
- 北アメリカ / Northern Alaska-Bering Sea Volcanic Province
- 標高
- 190m
- 座標
- 61.430, -164.470
- 最終噴火
- 不明
- テクトニクス環境
- プレート内部 / 大陸地殻 (> 25 km)
- 火山地形
- 火山群
- 主要岩石
- 玄武岩 / ピクライト質玄武岩
地質学的概要
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.
Wikipedia の要約
英語版の要約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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