北米コーディレラにおける古生代変動

スポンサーリンク

概要

• 論文の詳細を見る

• In the previous paper, the writer examined the So-called Nevadan orogeny of the American geologists and reached the following conclusion: the Nevadan orogeny is not orogeny in a traditional sense in geology. It is not accompanied by the eugeosynclinal thick piling of sediments and their folding with Contemporaneous regional metamorphism, but represented by acid volcanism in subaerial to subaqueous circumstances and by plutonism in unsinkitig region. The Navadan orogeny should be used as a synonym with our Hiroshima or Yenshan movement, which includes the Ryoke metamorphism as its fore-runner. In this paper, the writer examined the Paleozoic orogenies. In the Cordillera, two orogenies are recognised. One is the Antler orogency in the Late Carboniferous. Regional metamorphism reached the epidote amphibolite facies and the amphibolite facies in some parts in the western margin of the geosyncline. The other is the Sonoma orogeny in the Latest Permian to the Earliest Triassic. In the western side of the Antler metamorphic belt, there took place the regoinal metamorphism of the low temperature-high pressure type with the sporadic formation of glaucophane schist. Since the Late Paleozoic, the tectonic history is simmilar in both the North American Cordillera and Japanese Islands of the southeastern margin of the Asiatic continent. The Sanbagawa metamorphic belt corresponds to the Sonoma. metamorphic belt and the Jurassic to Cretaceous geosyncline including the Franciscan corresponds to the Shimanto geosyncline. Moreover, the Mesozoic acid igneous activities are similar in both regions. These common features in both regions are considered to be a fundamental attribute of the Circum-Pacific region and should be studied in the light of the tectonic history of the Pacific Ocean.

• 地学団体研究会の論文
• 1974-11-20

著者

• 端山 好和

  東京支部

関連論文

• 瀬戸内海大崎下島の変成古生層と白亜紀火成岩類
• 中部地方領家帯の天竜峡花崗岩と伊奈川花崗岩の関係
• 南京事件70周年に想う
• 「ワーキング・プア,アメリカの下層社会」, 著者 D.K.シプラー, 岩波書店, 2007(本の紹介)
• 私の町の戦争跡に想う(ゆく雲にたくして)
• 『子どもの危機をどう見るか』, 著者 尾木直樹, 岩波新書660円(本の紹介)
• ユーゴ紛争を読む(花綵通信)
• 北米コーディレラにおける古生代変動
• 北米コーディレラにおける中生代酸性火成活動の性格(特集 濃飛流紋岩およびそれに関連する酸性火成作用-地団研第24回総会シンポジウム-)

スポンサーリンク