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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 Siletz River Volcanics ： ウィキペディア英語版 Siletz River Volcanics The Siletz River Volcanics, located in the Oregon Coast Range, United States, is a sequence of basaltic pillow lavas that make up part of Siletzia. The basaltic pillow lavas originally came from submarine volcanoes that existed during the Eocene. The Paleocene to Eocene volcanics consist of volcanism flows and sills of tholeitic to alkalic basalts with associated tuff-breccia, siltstone and sandstone. The flows are vesiculated with zeolite filled amygdules. The volcanics originated as oceanic crust and seamounts. Potassium argon dating gives an age of 50.7 ± 3.1 to 58.1 ± 1.5 Ma.〔(【引用サイトリンク】title=Siletz River Volcanics and related rocks )〕 The sequence has been divided into a lower pillowed tholeiitic unit and an upper porphyritic alkali basalt unit. The volcanics occur in the following counties of western Oregon: Benton, Coos, Douglas, Lane, Lincoln, Polk, Tillamook, Washington and Yamhill.〔 ==References== 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「Siletz River Volcanics」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.