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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 Geology of the Pyrenees ： ウィキペディア英語版 Geology of the Pyrenees The Pyrenees form part of the huge alpine orogenic system. This 430 kilometre long, roughly east-west striking, intracontinental mountain chain divides France, Spain, and Andorra.〔Boillot, G & Capdevila, R (1977). The Pyrenees: subduction and collision. Earth Planet. ''Soc. Lett.'' 35:151-160.〕 It has an extended, polycyclic geological evolution dating back to the Precambrian. The chain's present configuration is due to the collision between the microcontinent Iberia and the southwestern promontory of the European Plate (i.e. Southern France). The two continents were approaching each other since the onset of the Upper Cretaceous (Albian/Cenomanian) about 100 million years ago and were consequently colliding during the Paleogene (Eocene/Oligocene) 55 to 25 million years ago. After its uplift, the chain experienced intense erosion and isostatic readjustments. A cross-section through the chain shows an asymmetric flower-like structure with steeper dips on the French side. The Pyrenees are not solely the result of compressional forces, but also show an important sinistral shearing. == Geographic arrangement == The Pyrenees ''sensu stricto'' stretch in a westnorthwest-eastsoutheast-direction (N 110) over 430 km from the Bay of Biscay in the west to the Golfe du Lion and the Golf de Roses in the east, their width across strike varying between 65 and 150 km. They are bounded in the north by the North Pyrenean Front (French: ''Front nord-pyrénéen'', also ''North Pyrenean frontal fault'' or ''NPFF''), a major thrust fault along which units from the North Pyrenean Zone have been transported over the Subpyrenean Zone, southernmost part of the Aquitaine Basin, their northern foreland. Their southern limit is the South Pyrenean Frontal Fault. Here, thrust slices from the Sierras Marginales and their lateral equivalents are displaced southward over the Ebro Basin. Yet in a larger, geologically more meaningful sense the Pyrenees continue farther west into the Basque and the Cantabrian mountains (the ''Basque-Cantabrian chain''). They finally disappear along the continental margin of Asturias. Likewise in the east, they do not just vanish in the Mediterranean but rather pursue their course via the nappe units of the Corbières into Bas Languedoc and even into southern Provence. At their far eastern end in Provence, typical pyrenean fold trends are superimposed by alpine structures to be finally cut off by the arc of the Western Alps. The pyrenean chain in the larger sense is nearly a 1000 km long. 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「Geology of the Pyrenees」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.