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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 Tres Virgenes ： ウィキペディア英語版 Tres Virgenes Tres Vírgenes is a complex of volcanoes located Mulegé Municipality in the state of Baja California Sur, on the Baja California Peninsula in northwestern Mexico. It is composed of three volcanoes, aligned northeast-southwest, with El Viejo, the oldest, to the northeast, El Azufre in the middle, and the youngest, El Virgen, to the southwest. El Virgen, being by far the most conspicuous of the three, is commonly known as "Las Tres Vírgenes". ==Eruption history== The last eruption of the volcanoes in the complex was of El Virgen, but the date is disputed. A map drawn by the Croatian Jesuit missionary Ferdinand Konščak contains a reference to an eruption in 1746.〔Ives, Ronald, ''Dating of the 1746 Eruption of Tres Virgenes Volcano, Baja California Del Sur, Mexico,'' Geological Society of America Bulletin, v. 73, pp. 647-648, May 1962.〕 Radiometric datings, however, do not agree with this. A charcoal fragment found in a volcanic deposit was dated at approximately 6515 years before present.〔Capra et al., ''Holocene plinian eruption of La Virgen Volcano, Baja California, Mexico,'' Journal of Volcanology and Geothermal Research, Issue 80 pp. 239–266, 1998.〕 A basaltic lava flow, which must be younger than the actual eruption, was dated at approximately 24 thousand years B.P.〔Hausback and Abrams, ''Plinian eruption of La Virgen Tephra, Volcán Las Tres Virgenes, Baja California Sur, Mexico'', American Geophysical Union, Issue 77, pp. 813–814, 1996.〕 which agrees with a dating of tephra fragments from El Virgen that yielded an age of approximately 36 thousand years B.P. for the eruption.〔Schmitt et al., ''Eruption and magma crystallization ages of Las Tres Vírgenes (Baja California) constrained by combined 230Th/238U and (U–Th)/He dating of zircon,'' Journal of Volcanology and Geothermal Research, Issue 158, pp. 281–295, 2006.〕 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「Tres Virgenes」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.