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East Tasman Plateau
The East Tasman Plateau is a submerged microcontinent south east of Tasmania. Its area is , and it is mostly from deep. It is a circular piece of continental rocks surrounded by oceanic crust. Volcanism occurred there .〔C. Gaina, R. D. Müller, B. Brown and T. Ishihara: (''Microcontinent formation around Australia'' ) in Geological Society of Australia Special Publication 22, 2001 page 400–405〕 The East Tasman Plateau is separated from the island of Tasmania by of deeper water, and the East Tasman Saddle is a higher ridge connecting the plateau to the Freycinet Peninsula region of the Tasmanian East Coast.〔 This ridge runs north west from the plateau.〔 South-west of the plateau is the L'Atalante Depression.〔
==Tectonics==
Prior to tectonic rifting, the East Tasman Plateau microcontinent was attached to the southeast of Tasmania and the north east of the South Tasman Rise.〔 To the northeast, east and south east of the plateau was the Lord Howe Rise.
In the Cretaceous period, the continental breakup of Gondwana started near Tasmania. About a rift entered the east coast of Tasmania from the south and split off the Lord Howe Rise〔 from the South Tasman Rise to the west.〔 Sea floor spreading continued to move this continental sliver away to the east from Tasmania and Australia, and the rift jumped into the Lord Howe Rise and separated off the East Tasman Plateau.〔 The detachment of the East Tasman Plateau from the Lord Howe Rise has left a large gulf on the west side of the Lord Howe Rise around 38°S 162°E where it used to be.〔
In the late Cretaceous the East Tasman Plateau was at 65°S and it moved north to 60°S in early Oligocene.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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