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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 Shiva crater ： ウィキペディア英語版 Shiva crater The Shiva Crater is a geologic structure, which is hypothesized by Sankar Chatterjee〔Chatterjee, S. (1997) (''Multiple impacts at the KT boundary and the death of the dinosaurs.'' ) Proceedings of the 30th International Geological Congress. 26:31-54. last accessed 2012-02-01〕 and colleagues to be a 500-km-diameter impact structure. This geologic structure consists of the Bombay High and Surat Depression. They lie beneath the Indian continental shelf and the Indian Ocean west of Mumbai, India. Chatterjee named this structure after Shiva, the Hindu god of destruction and renewal.〔〔Chatterjee, S., N. Guven, A. Yoshinobu, and R. Donofrio. (2006) ''Shiva Structure: a possible KT boundary impact crater on the western shelf of India.'' Museum of Texas Tech University Special Publications. 50, 39pp.〕 ==Arguments== Chatterjee argues that the Shiva Crater was created around 66 million years ago, about the same time as a number of other impact craters and the Cretaceous–Paleogene extinction event (Cretaceous–Paleogene boundary / K-Pg boundary). Although the site has shifted since its formation because of sea floor spreading, the formation is approximately long by wide. It is estimated that this proposed crater would have been made by an asteroid or comet approximately in diameter.〔〔 At the time of the Cretaceous–Paleogene extinction, India was located over the Réunion hotspot of the Indian Ocean. Hot material rising from the mantle flooded portions of India with a vast amount of lava, creating a plateau known as the Deccan Traps. It has been hypothesized that either the crater or the Deccan Traps associated with the area are the reason for the high level of oil and natural gas reserves in the region. Earth scientists in general remain unconvinced that the "Shiva Crater" is indeed an impact crater. For example, Christian Koeberl, a professor of impact research and planetary geology at the University of Vienna, Austria, regards the Shiva Crater to be "a figment of imagination."〔 - original article at (source )〕 Currently, it is not recognized as an impact crater by the Earth Impact Database of the Planetary and Space Science Centre at the University of New Brunswick, Canada. 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「Shiva crater」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.