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Zealandia (continent)
Zealandia , also known as Tasmantis or the New Zealand continent, is a nearly submerged continental fragment that sank after breaking away from Australia 60–85 Ma (million years) ago, having separated from Antarctica between 85 and 130 Ma ago. It may have been completely submerged about 23 Ma ago, and most of it (93%) remains submerged beneath the Pacific Ocean.
== Description ==
Zealandia is 3.5 million square km in area, almost half the size of Australia. It is unusually slender, stretching from New Caledonia in the north to beyond New Zealand's subantarctic islands in the south (from latitude 19° south to 56° south,〔 analogous to ranging from Hudson Bay to Haiti or from Sweden to Sudan in the northern hemisphere). New Zealand is the largest part of Zealandia above sea level, followed by New Caledonia.
The major submerged parts of Zealandia are the Lord Howe Rise, Challenger Plateau, Campbell Plateau, Norfolk Ridge, and the Chatham Rise. Smaller provinces include the Louisiade Plateau, Mellish Rise, Kenn Plateau, Chesterfield Plateau, and Dampier Ridge.〔.〕 The seemingly separate Gilbert Seamount (northwest of Fiordland) is also part of the New Zealand continental fragment, while how strongly Bollons Seamount (south of the Chatham Islands) remains connected to Zealandia is unknown.
Zealandia supports substantial inshore fisheries and contains New Zealand's largest gas field, near Taranaki. Permits for oil exploration in the Great South Basin were issued in 2007.〔(【引用サイトリンク】title=Great South Basin – Questions and Answers )〕 Offshore mineral resources include iron sands, volcanic massive sulfides and ferromanganese nodule deposits.〔(【引用サイトリンク】title=New survey published on NZ mineral deposits )〕
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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