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Mount Oku, or Kilum Mountain, is the largest volcano in the Oku Massif, in the Cameroon Volcanic Line, located in the Oku region of the Western High Plateau of Cameroon.〔 It is the second highest mountain in mainland Central Africa.〔 The stratovolcano rises to above sea level, and is cut by a large caldera.〔 ==Geology== Some of the rocks have ages starting from 24.9 to 22.1 million years ago, but much more recent activity has occurred. The mountain is built of basaltic and hawaiitic lavas, succeeded by trachytes, and then by large volumes of trachytic and rhyolitic ignimbrites with a thickness of up to 1,000 m. Further trachytic lavas, tuffs and breccias were produced, and the most recent phase produced pyroclastic cones and explosion craters. One of these craters holds Lake Oku, from which flows of basalt issued in the north, and of rhyolitic and phonolitic lavas in the south.〔 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「Mount Oku」の詳細全文を読む スポンサード リンク
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