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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 Duluth Complex ： ウィキペディア英語版 Duluth Complex The Duluth Complex, the related Beaver Bay Complex,〔Green, (Volcanic and Sedimentary Rocks ) (2004), p. 47.〕 and the associated North Shore Volcanic Group are rock formations which comprise much of the basement bedrock of the northeastern part of the U.S. state of Minnesota in central North America.〔Jirsa & Southwick, (Mineral Potential ) (2000).〕 The Duluth and Beaver Bay complexes are intrusive rocks formed during the Midcontinent Rift; these adjoin and are interspersed with the extrusive rocks of the North Shore Volcanic Group produced during the same geologic event. These formations are part of the Superior Upland physiographic region of the United States, which is associated with the Laurentian Upland of the Canadian Shield,〔(Tapestry of Time and Terrain ) (2003).〕 the core of the North American Craton. ==Location== The Duluth Complex includes much of Minnesota's Arrowhead Region north of Lake Superior. From the west near Duluth, Minnesota, it arcs north and northeast to about 48° north latitude south of Knife Lake, proceeds east at that latitude some five to twenty kilometers distant from and south of the Canadian border to about 90° west longitude where it joins the border at the Pigeon River, and thence runs east near and along the border to Lake Superior.〔Jirsa & Southwick, (Mineral Potential ) (2000); Heinselman (1996), plate 1.〕 The Duluth and Beaver Bay complexes lie south of this line. Near Lake Superior these intrusive formations intermingle in a complex mosaic with the rocks of the associated North Shore Volcanics, which also are relics of the Midcontinent rifting event.〔Miller, Green, Severson, Chandler, & Peterson, (Geologic Map of the Duluth Complex ), (2001).〕 The Duluth and Beaver Bay Complexes extend a short distance under Lake Superior south of the present lakeshore, but in most places along and near that shore their southern reaches are overlain by the North Shore Volcanic Group.〔Ojakangas & Matsch (1982), pp. 52, 55–56.〕 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「Duluth Complex」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.