翻訳と辞書 Words near each other ・ West Africa Squadron ・ West Africa Study Circle ・ West Africa Time ・ West Africa's Next Top Model ・ West African Airways Corporation ・ West African Aquatic Mammals Memorandum of Understanding ・ West African Bankers' Association ・ West African batis ・ West African birchir ・ West African black turtle ・ West African Campaign ・ West African catshark ・ West African CFA franc ・ West African Club Championship ・ West African College of Surgeons ・ West African Craton ・ West African crocodile ・ West African cuisine ・ West African Development Bank ・ West African Dwarf (sheep) ・ West African Dwarf goat ・ West African Elephant Memorandum of Understanding ・ West African Examinations Council ・ West African Football Academy ・ West African Football Union ・ West African Footballer of the Year ・ West African Gas Pipeline ・ West African giraffe ・ West African Insurance Institute ・ West african jihads Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク West African Craton ： ウィキペディア英語版 West African Craton The West African Craton is one of the five large masses, or cratons, of the Precambrian basement rock of Africa that make up the African Plate, the others being the Kalahari craton, Congo craton, Saharan Metacraton and Tanzania Craton. These land masses came together in the late Precambrian and early Palaeozoic eras to form the African continent. At one time, volcanic action around the rim of the craton may have contributed to a major global warming event. ==Location and composition== The craton appears to have formed when three Archean cratons fused: Leo-Man-Ghana, Taoudeni and Reguibat. The first two docked around 2,100 Ma (million years ago), and the Reguibat Craton docked with the craton around 2,000 Ma. The roots of the combined craton extend to a depth of over 300 km in the sub-continental lithospheric mantle. The West African Craton stretches from the Little Atlas mountains of Morocco to the Gulf of Guinea, and is bounded by mobile belts of much younger rocks to the north, east and west. The oldest rocks were metamorphosed 2,900 to 2,500 million years ago. In the Sahara they are mostly covered by more recent sediments from the Phanerozoic Eon. Further south, younger volcanic and sedimentary rocks outcrop in Ghana, Ivory Coast, and Sierra Leone, surrounded by even younger sediments laid down in the Precambrian. The West African Craton underlies the modern countries of Morocco, Algeria, Mauritania, Senegal, The Gambia, Guinea Bissau, Guinea, Mali, Burkina Faso, Sierra Leone, Liberia, Ivory Coast, Ghana, Togo and Benin. 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「West African Craton」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.