| 翻訳と辞書 |
Adare Basin
The Adare Basin is a geologic structural basin located north-east of Cape Adare of Antarctica, for which its named, and north of the western Ross Sea. The Adare basin is an extensional rift basin located along a seafloor spreading center. Centrally located in the Adare Basin is the Adare Trough, the failed arm of the tertiary spreading ridge separating East and West Antarctica, similar in structure to The East Africa Rift System. The extension of this rift system, known as the West Antarctic Rift System, is highly recorded in a series of magnetic anomalies which run along the seafloor at the extinct, north-south trending, Adare spreading axis.
==Antarctic extension==
The continent of Antarctica is divided into two continental blocks, separated by the Transantarctic Mountains of the West Antarctic Rift System. East Antarctica, also known as Greater Antarctica, composes two-thirds of the landmass of Antarctica and is considered the coldest and driest landmass on Earth. East Antarctica is a stable craton of Precambrian age.〔(【引用サイトリンク】 title=Antarctic Geology )〕 Meanwhile, West Antarctica is an orogenic belt composed of several smaller units, which converged 100 ma. These units are covered in a vast ice sheet, known as the West Antarctic Ice Sheet. Two major extensional events have affected the West Antarctic Rift System. This led to the formation of a series of continuous, north-south trending basins stretching from the Transantarctic mountains out into the Ross Sea embayment. The first is associated with the breakup of the super continent, Gondwana (Gondwanaland), during the Jurassic or Cretaceous. The second, is associated with the formation of the West Antarctic Rift System between East and West Antarctica, which began in the Eocene and lasted into the late Oligocene era. This extensional phase was responsible for the formations of the basins on the continental shelf, including the Adare Basin. There has been considerable debate over the kinematic history of the West Antarctic Rift.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Adare Basin」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|