Ecuador · Vulcano a scudo
Genovesa Island
Genovesa
- Tipo
- Vulcano a scudo
- Altitudine
- 64 m
- Ultima eruzione
- Sconosciuto
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- Tipo
- Vulcano a scudo
- Paese
- Ecuador
- Regione
- Pacifico orientale / Northern Galapagos Volcanic Province
- Altitudine
- 64 m
- Coordinate
- 0.320, -89.958
- Ultima eruzione
- Sconosciuto
- Contesto tettonico
- Zona di rift / Crosta oceanica (< 15 km)
- Forma vulcanica
- A scudo
- Roccia principale
- Basalto / Picrobasalto
Sintesi geologica
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 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 6,000 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 recorded 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 plagioclase crystals.
Sintesi da Wikipedia
Riassunto in ingleseGenovesa 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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