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헤노베사섬

Genovesa

순상화산 · Ecuador · 64m

A sea lion perches on a tilted slab of a lava flow dipping toward the west side of Darwin Bay. A 2-km-wide excentric caldera on the south side of Genovesa Island forms an embayment that is filled by the bay. The small, very low island of Genovesa is the top of a shield volcano, whose summit is only 64 m high. No historical eruptions are known from Genovesa, although the fresh-looking lava flows suggest a very youthful age.
A sea lion perches on a tilted slab of a lava flow dipping toward the west side of Darwin Bay. A 2-km-wide excentric caldera on the south side of Genovesa Island forms an embayment that is filled by the bay. The small, very low island of Genovesa is the top of a shield volcano, whose summit is only 64 m high. No historical eruptions are known from Genovesa, although the fresh-looking lava flows suggest a very youthful age. · 사진: Photo by Carter Hearn, 2004. · Wikimedia Commons
화산 유형
순상화산
국가
Ecuador
지역
동태평양 / Northern Galapagos Volcanic Province
해발
64m
좌표
0.320, -89.958
마지막 분화
미확인
판구조 환경
Rift zone / Oceanic crust (< 15 km)
화산 지형
Shield
주요 암석
Basalt / Picro-Basalt
지질학적 요약

The small, very low island of Genovesa is the top of a shield volcano. The surface of a summit crater lake is near sea level. A larger, 2-km-wide excentric caldera on the S side forms an embayment that is filled by Darwin Bay. Sediment filling Arctulus Lake, a crater in the center of the island, is less than 6000 years old. Youthful flows erupted from flank fissures cover much of the island and very fresh, glassy spatter has been found (Simkin 1976, pers. comm.). No historical eruptions are known, although the fresh-looking lava flows suggest a very youthful age. Basaltic rocks on the island are noted for their abundant coarse plagioclases.

Wikipedia 요약

영어 요약

Genovesa Island, also known as Tower Island, is a shield volcano in the Galápagos Islands in the eastern Pacific Ocean. The island occupies about 14 km2 (5 sq mi), and its maximum elevation is 64 m (210 ft). The horse-shoe shaped island has a volcanic caldera whose wall has collapsed, forming the Great Darwin Bay, surrounded by cliffs. The saltwater Lake Arcturus lies in the middle, and sediment within this crater lake is less than 6,000 years old. Although no historical eruptions are known from Genovesa, there are very young lava flows on the flanks of the volcano.

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