Amitzok gneiss - Amitzok gneiss

Japanese: アミツォック片麻岩 - あみつぉっくへんまがん
Amitzok gneiss - Amitzok gneiss


[Oldest rocks]
West Greenland is a shield made up of Archean geological systems (2.6 to 2.9 billion years ago). The Amitzok gneiss, which is distributed near the capital of Godthaap, located in the center of the shield, has been radiometrically dated to 3.8 billion years ago by the lead-lead whole rock isochron method and 3.7 billion years ago by the rubidium-strontium method. Banded iron formations and weakly metamorphosed sedimentary rocks are distributed in the Isua region, about 150 km northeast of Godthaap, and have been dated to 3.76 billion years ago by the lead-lead method, making it the oldest supracrustal rock in the world.

*Some of the terminology that refers to "Amitzok gneiss" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:


[最古の岩石]
 西グリーンランドには始生代の地質系統(26億~29億年前)からなる楯状地がある。この中央部に位置する主都のゴットホープ付近に分布するアミツォック片麻岩は,鉛‐鉛全岩アイソクロン法によって38億年前,ルビジウム‐ストロンチウム法によって37億年前という放射年代が与えられている。また,ゴットホープの北東150km付近のイスア地域には縞状鉄鉱層と弱変成作用をうけた堆積岩が分布し,鉛‐鉛法で37.6億年前とされ,世界最古の表成岩地殻であるとされている。…

※「アミツォック片麻岩」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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