Joseph Gilbert Seamount | |
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Summit depth | 2,400 m (7,900 ft) |
Location | |
Location | Tasman Sea |
Coordinates | 42°52′18.1″S 164°4′0.1″E / 42.871694°S 164.066694°E |
Country | New Zealand |
Geology | |
Type | Seamount ( continental fragment) |
Joseph Gilbert Seamount is a large seamount in the Tasman Sea located 450 km (280 mi) west of the South Island of New Zealand at the southern edge of the Lord Howe Rise. [1] [2] It has an elongated northwest–southeast trend, covering an area of about 11,500 km2 (4,400 sq mi) and rising to 2,400 m (7,900 ft) below sea level. [2]
The seamount is a continental fragment that rifted away from the South Tasman Rise and Challenger Plateau during the Cretaceous breakup of Gondwana. [2] [3] It is separated from the easterly Challenger Plateau by a 4,400 m (14,400 ft) deep saddle. [2]
Joseph Gilbert Seamount is named after Joseph Gilbert, captain of HMS Resolution (1771) on the second voyage of James Cook, [1] and has been known under a variety of names throughout its history, including Gilbert Ridge, Gilbert Seamount Complex and Gilbert Seamount. [1]