Endeavour Segment

割れ目火口 · Canada · 2050m (海底)

This 360°C black smoker chimney is located in the Endeavour Ridge segment of the Main Endeavour hydrothermal field at the northern end of the Juan de Fuca Ridge. Tube worms with red gills thrive on the edifice, which is predominantly composed of iron- and sulfur-bearing minerals. The 90-km-long ridge segment, which lies west of the coast of Washington and SW of Vancouver Island, is the site of vigorous high-temperature hydrothermal vent systems that were first discovered by scientists in 1981. · 写真: Image courtesy of NOAA Ocean Explorer and University of Washington.

タイプ: 割れ目火口
国: Canada
地域: Eastern Pacific Volcanic Regions / Northeast Pacific Rifts Volcanic Province
標高: 2050m (海底)
座標: 47.950, -129.100
最終噴火: -3490年
テクトニクス環境: Rift zone / Oceanic crust (< 15 km)
火山地形: Cluster
主要岩石: Basalt / Picro-Basalt

地質学的概要

The Endeavour Segment (or Ridge) lies near the northern end of the Juan de Fuca Ridge, W of the coast of Washington and SW of Vancouver Island. The northern end is offset to the east with respect to the West Valley Segment, which extends north to the triple junction with the Sovanco Fracture Zone and the Nootka Fault. The 90-km-long, NNE-SSW-trending segment lies at a depth of more than 2,000 m and is the site of vigorous high-temperature hydrothermal vent systems that were discovered in 1981. Five major vent fields that include sulfide chimneys and black smoker vents are spaced at about 2-km intervals in a 1-km-wide axial valley at the center of the ridge. Preliminary uranium-series dates of Holocene age were obtained on basaltic lava flows, and other younger "zero-age" flows were sampled. Seismic swarms were detected in 1991 and 2005.

噴火履歴

概要 (VEI時系列)

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詳細タイムライン

紀元前 3490年VEI 0地質学的推定
BCE 3490 ~ 進行中
紀元前 6930年VEI 0地質学的推定
BCE 6930 ~ 進行中

外部リンク

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