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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 Dalgaranga crater ： ウィキペディア英語版 Dalgaranga crater Dalgaranga crater is a small meteorite impact crater located on Dalgaranga pastoral station 75 km west of Mount Magnet (or north of Yalgoo) in Western Australia. It is only 24 m in diameter and 3 m deep, making it Australia's smallest impact crater (with exception of the smallest members of the Henbury crater field).〔Bevan A.W.R. 1996. Australian crater-forming meteorites. AGSO Journal of Australian Geology & Geophysics 16, 421–429.〕 Though discovered in 1921, it was not reported in the scientific literature until 1938.〔Simpson E.S. 1938. Some new and little known meteorites found in Western Australia. Mineralogical Magazine 25, 157–171.〕 The bedrock at the site is weathered Archaean granite of the Yilgarn Craton. The discovery of fragments of mesosiderite stony-iron meteorite around the crater confirms an impact origin,〔Nininger H.H. & Huss G.I. 1960. The unique meteorite crater at Dalgaranga, Western Australia. Mineralogical Magazine 32, 619–639.〕 making this crater unique as the only one known to have been produced by a mesosiderite projectile. Asymmetries in the crater structure and the ejecta blanket imply that the projectile impacted at low angle from the south-southeast.〔Shoemaker E.M., Macdonald F. A. & Shoemaker C.S. 2005. Geology of five small Australian impact craters. Australian Journal of Earth Sciences 52, 529–544. (Abstract )〕 The age is not accurately constrained but must be young because it is so well preserved for its small size, and the meteorite fragments have not weathered away; some authors suggest an age of as young as 3000 years. 〔Shoemaker E.M. & Shoemaker C.S. 1988. Impact structures of Australia (1987). Lunar and Planetary Science Conference XIX, 1079–1080. (Abstract )〕 ==Discovery== The crater was discovered by an Aboriginal stockman named Billy Seward in 1921. The meteorites were found shortly after by Gerard Wellard, the station manager, when Seward took him to the site. It was not until 1923 that meteorite fragments were sent to the Western Australian Museum. 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「Dalgaranga 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.