…In 1934, German geologist H. Stille defined five regions on Earth as the world's oldest continental masses, which he named the Urkraton protolith. These were called Rusia (most of Scandinavia and parts of Russia), Angaria (central Siberia), Laurentia (most of Canada and Greenland), Sinia (eastern China), and Gondwania (South America, Africa, India, etc.), but most of them are shields. The oldest rocks known today are gneisses on the west coast of Greenland, which belong to the Canadian Shield, and their age has been estimated to be 3.8 to 3.9 billion years. … *Some of the terminology explanations that mention "Angaria" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ドイツの地質学者シュティレH.Stilleは1934年,世界最古の大陸塊として五つの地域を地球上に設定し,原剛塊Urkratonと名づけた。これらは,ルシア(スカンジナビアの大部分とロシアの一部),アンガリア(シベリア中部),ラウレンティア(カナダとグリーンランドの大半),シニア(中国東部),ゴンドワニア(南アメリカ,アフリカ,インドなど)と呼ばれたが,大部分が楯状地である。今日知られている最古の岩石はカナダ楯状地に属するグリーンランド西岸の片麻岩で,その年齢は38億~39億年と測定されている。… ※「アンガリア」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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