| 翻訳と辞書 |
| Tyrrhenian Basin ： ウィキペディア英語版 |
Tyrrhenian Basin
The Tyrrhenian Basin is a sedimentary basin located in the eastern Mediterranean Sea. It covers a 231,000 km² area that is bounded by Sardinia to the west, Corsica to the northwest, Sicily to the southeast, and peninsular Italy to the northeast. The Tyrrhenian basin displays an irregular seafloor marked by several seamounts and two distinct sub-basins - the Vavilov and Marsili basins. The Vavilov deep plain contains the deepest point of the Tyrrhenian basin at approximately 3785 meters. The basin trends roughly northwest-southeast with the spreading axis trending northeast-southwest.
== Regional geologic setting ==
The Tyrrhenian basin is located in a geologically complex portion of the Mediterranean Sea. The basin is partially encircled by several orogenic belts, including the Apennines to the northeast, the Alps to the north, and the Atlas mountains to the southwest. It is also bounded by a convergent boundary and associated trench to the southeast. Deep reflection seismic lines near the trench clearly show oceanic lithosphere from the African plate flexing beneath Calabria to join a seismogenic slab that extends down to 500 km beneath the Tyrrhenian basin.〔 Between the upper slope of the trench and Calabria are a number of small fore-arc basins that developed through extensional listric faulting during the Tortonian.〔 These basins subsequently subsided between the late Pliocene and Quaternary and are now infilled with mélange.〔
The Aeolian Islands north of Calabria and Sicily represent the volcanic arc of the convergent system. The volcanism associated with these islands occurs at the northeast closure of the downgoing slab and began approximately during the late Pliocene to early Pleistocene (1.5-1.7 Ma).〔
The Tyrrhenian basin lies to the northwest of the Aeolian Islands and represents a back-arc basin formed from tensional forces associated with the northwest subduction of the African plate beneath the Eurasian plate. Similar to other back-arc basins, the Tyrrhenian basin displays a shallowing of the Moho discontinuity towards the central part of the basin, a Wadati Benioff zone, abnormally high heat flow (exceeding 200 mW/m² in some places), and an active volcanic belt on the arc-ward edge of the basin.
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「Tyrrhenian 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.
|
|