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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 Fen Complex, Norway ： ウィキペディア英語版 Fen Complex, Norway The Fen complex ((ノルウェー語:Fensfeltet)) in Nome, Telemark, Norway is a region noted for an unusual suite of igneous rocks. Several varieties of carbonatite are present in the area as well as lamprophyre, ijolite and other highly alkalic rocks. It is the type locality for fenite, a metasomatic rock commonly found around carbonatite and alkali intrusives.〔http://www.mindat.org/loc-14357.html Mindat location description〕 The Fen complex is a roughly circular area about three kilometres in diameter. It is located just west of the Oslo graben. Radiometric age dating on the carbonatites gave an age of 539 +/- 14 Myr.〔Faure, Gunter (2000) ''Origin of Igneous Rocks'', Springer, pp. 319-321 ISBN 3-540-67772-0〕 The host rocks for the intrusions are middle Proterozoic granites and gneiss and the complex was associated with the Cambrian rifting of the cratonic rocks.〔 The complex is a protected location because of the rare minerals and rock types found there. The rocks were first described by Waldemar Christofer Brøgger in 1921.〔 ==References== 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「Fen Complex, Norway」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.