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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 Geology of Vietnam ： ウィキペディア英語版 Geology of Vietnam The territory of Vietnam is divided into five structural blocks : Northeast (NE), Northwest (NW), Truongson, Kon Tum and Nambo. The NE block is a part of the South China plate, in which strata and igneous rocks have been found dating from the Early Paleozoic to the Quaternary. The NW and Truongson blocks are regarded as NW-SE trending Paleozoic folded systems filled with thick (>12000 m) Paleozoic formations. Precambrian strata are widespread in the Red River Fault zone and Fansipan range in the NW block, and in the Kon Tum block. Archean rocks are found only in the Kon Tum block, which is regarded as a stable massif without Paleozoic sedimentary rocks. The Nambo block is covered with a very thick (>6000 m) sequence of Cenozoic formations deposited in a continental rift. During the Mesozoic many such graben structures were formed and become basins for sedimentation. Igneous activity in Vietnam is divided into five episodes from the Archean to Quaternary. The most important impediments to the description and interpretation of geology in Vietnam are lack of reliable radiometric and structural data, and scarcity of good outcrops.〔(CiNii 論文 - The geology of Vietnam : A brief summary and problems )〕 ==Mining== Vietnam's mineral resources, apart from offshore oil and gas, include phosphate, coal, bauxite, base and precious metals, and a variety of industrial minerals. More than 5,000 mineral occurrences have been identified. Five broadly-defined metallogenic epochs have been recognised and, in general, the younger the setting the more abundant the deposits. Only a few are hosted by Precambrian rocks, principally iron, gold and graphite. The early to mid-Palaeozoic contains small deposits of iron ore, lead–zinc and large deposits of potash. Larger deposits of iron ore, ilmenite, gold, nickel–copper and bauxite were formed during the early Carboniferous/late Triassic.〔(Mining in Viet Nam - Overview )〕 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「Geology of Vietnam」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.