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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 Kursk Magnetic Anomaly ： ウィキペディア英語版 Kursk Magnetic Anomaly Kursk Magnetic Anomaly ((ロシア語:Курская магнитная аномалия)) is a territory rich in iron ores located within the Kursk, Belgorod, and Voronezh oblasts in Russia, and constitutes a significant part of the Central Chernozyom Region. The Kursk Magnetic Anomaly is recognized as the largest magnetic anomaly on Earth. The Kursk Magnetic Anomaly (KMA) was first discovered in 1773 by the Russian astronomer and academic Pyotr Inokhodtsev while preparing the maps of the General Land Survey ((ロシア語:Генеральное межевание)) at the behest of the Russian government. It was not investigated again until 1874 when I. N. Smirnov conducted the first geomagnetic survey of European Russia. In 1883, N. D. Pilchikov an assistant professor at Kharkiv University conducted a series of 71 observations of the Kursk Magnetic Anomaly. These revealed a much larger extent than previously measured and for the first time attributed the anomaly to the presence of iron ore. In 1884, on the basis of this discovery, Pilchikov was awarded the silver medal of the Russian Geographical Society. Serious investigation of the economic potential of the anomaly occurred under the leadership of Ivan Gubkin in 1920-1925, originally based upon the possibilities for oil. Rich ores were discovered in the region of the anomaly about 1931. The ores are spread over an area estimated at 120,000 km² and are magnetite quartzites disseminated throughout metamorphic rocks and Pre-Cambrian granitoids. Surveyed ore reserves of ferrous quartzite are presently estimated at more than 25 billion tonnes of 32-37% Fe and more than 30 billion tonnes of 52-66% Fe. The open pit method is used to mine this ore at the Stoylenskoye, Lebedinskoye, and Mikhailovskoye deposits. Underground mining methods are used for the Korobkovskoye deposit. == See also == * Stoilensky GOK 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「Kursk Magnetic Anomaly」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.