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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 Haddington Island (British Columbia) ： ウィキペディア英語版 Haddington Island (British Columbia) Haddington Island is a small volcanic island in the Canadian province of British Columbia, located south of Malcolm Island and Broughton Strait. It is located in the Mount Waddington Regional District. The closest major community to Haddington Island is Port Hardy.〔(Mineral Resources Education Program of BC )〕 ==Geology== Haddington Island is a member in the chain of volcanic peaks that run from Brooks Peninsula northeastward across Vancouver Island to Port McNeill, called the Alert Bay Volcanic Belt. The existence of felsite and andesite at Haddington Island suggests it might have formed 3.7 million years ago as the Juan de Fuca and Explorer Plate to its west subducted under the North American Plate at the Cascadia subduction zone.〔 As the ocean crust of the Juan de Fuca and the Explorer Plate melts, it creates magma that penetrates the crust, causing periodic eruptions of the volcanoes. The western end of the Alert Bay Volcanic Belt is now approximately northeast of the Nootka Fault, which separates the Explorer and Juan de Fuca plates. However, at the time of its formation Haddington Island may have been coincident with the subducted plate boundary.〔 Also, the timing of volcanism corresponds to shifts of plate motion and changes in the locus of volcanism along the Pemberton and Garibaldi volcanic fronts. This brief interval of plate motion adjustment approximately 3.5 million years ago may have triggered the generation of basaltic magma along the descending plate edge. Although commonly referred to as andesite, by chemical composition the Haddington Island volcanic rocks are in fact dacite. The rock has a very fine grained to aphanitic texture, and has a light blue-grey to a warm brown-grey range in colour. The groundmass comprises 80-85% plagioclase feldspar, with lesser quartz, biotite and magnetite.〔 Small, 1–2 mm plagioclase phenocrysts are distributed through the rock mass, and form approximately 1% of its volume.〔 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「Haddington Island (British Columbia)」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.