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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Middle Magdalena Basin ： ウィキペディア英語版 Middle Magdalena Basin The Middle Magdalena Basin is an intermontane basin located in northwestern Colombia between the Central and Eastern Cordilleras of the Andes Mountains. It is structurally bounded by the Palestina Fault to the west and the Bucaramanga Fault to the east.〔 The basin is part of the Magdalena Valley which includes the Upper Magdalena Basin to the south and Lower Magdalena Basin to the northwest of the Middle Magdalena Basin.〔 The basin elongate in that it is only approximately 80 km wide but extends to the north approximately 450 km where it terminates against the Santander Massif and Cesar Valley. To the south it terminates against the Upper Magdalena Basin, which consists of the Girardot and Nieva sub basins where the Central Cordillera and Eastern Cordillera converge.〔 == Basin development == During the Jurassic period, Pangea began to pull apart causing separation of North America from South America.〔 This rifting produced a subduction zone where the Nazca plate was subducting to the east under the South American plate. Part of this subducting plate was the Baudo-Island Arc separated from the South American continent by the marginal Colombian Sea.〔 The formation of the extensional back-arc basin associated with this subduction is the origin of the Middle Magdalena Basin in the late Jurassic.〔 Throughout the Cretaceous, the basin experienced thermal subsidence and five transgressive-regressive cycles as part of a marine megacycle.〔〔 In the Paleocene, the rate of subduction increased causing the marginal Colombian Sea to close and the Baudo-Island Arc to collide with the South American continent.〔 This caused accretion of the Western Cordillera and uplift of the Central Cordillera transforming the back-arc basin into the pre-Andean foreland basin.〔〔〔 Around the time of the Oligocene, the Nazca plate increased its subduction to the east while the South American plate experienced a westward pull. This caused the Andean orogeny in the Miocene and uplift of the Eastern Cordillera in the Pliocene.〔 Now the Middle Magdalena basin is an intermontane basin situated between the uplifted Central and Eastern Cordilleras.〔 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「Middle Magdalena 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.