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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 Semilir Eruption ： ウィキペディア英語版 Semilir Eruption Semilire eruption is a large eruption in Indonesia. This eruption formed Semilire Formation and Nglanngran Formation. These two geological formations are in Southern Mountains of East Java. The eruption took place in Early Miocene, and formed two formations consists mostly pyroclastic rock(minor lava flows). It has incredibly thickness(at least 1200 m). In contrast, Toba eruption only formed 600 m ignimbrite. Semilir eruption age date by isotope method is 21 million years ago. == Geology Background == Java is between Asia and Australia at the centre of the Indonesian archipelago where the Indo-Australian Plate subducts beneath the Eurasian Plate. There has been subduction at the Java Trench since the Early Cenozoic. An Eocene to Early Miocene volcanic arc in East Java, the Southern Mountains Arc, is parallel to and south of the modern arc. Thick volcanic and volcaniclastic deposits related to this arc are well preserved in East Java and identified volcanic centres are separated by similar distances to volcanoes of the modern arc. New field investigations and stratigraphic studies in East Java have identified the most important features of arc activity in the Southern Mountains. The oldest sedimentary rocks are conglomerates and sandstones that lack volcanic material and were deposited unconformably on a basement that included ophiolitic and continental rocks. In the overlying sedimentary rocks volcanic debris and detrital zircons indicate initiation of the arc, and subduction beneath Java, by the Middle Eocene (42 Ma). The arc was active until the Early Miocene (18 Ma) and volcanic activity was most abundant during the Oligocene to Early Miocene. Volcanic activity was commonly explosive and of Plinian-type. The erupted products range from andesite to rhyolite and formed lava flows, lava domes, volcanic breccias and extensive pyroclastic deposits including flow, air-fall and pyroclastic surge deposits. Volcanic activity along the Southern Mountains Arc culminated in the Early Miocene in a climactic phase of eruptions preserved in the Batu Agung Escarpment, near Yogyakarta. It was during this climactic phase that the Semilir Eruption occurred.〔 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「Semilir Eruption」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.