深い大陸の根とクレートン
D Graham Pearson1, James M Scott2, Jingao Liu3
1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada. gdpearso@ualberta.ca.
Nature
|August 12, 2021
まとめ
地球の古代大陸のコアであるクレートンは,低圧の融解と深層輸送によって形成された厚いマントルの根によって保存されています. 大陸の出現を可能にしたこれらの安定した石層の根を形成する鍵となるのは,オロジェニックの加厚化プロセスでした.
科学分野:
- 地質学
- 地理学
- 構造学
背景:
- クラトンは古代の大陸の核であり 地球の歴史を理解するのに不可欠です
- 形成と保存,特にマントルの根は,重要な地質的な課題です.
- メソアケアとパレオプロテロゾイク時代は長寿クレートンの組み立てに不可欠でした.
研究 の 目的:
- クラトン岩層の形成と進化を調査する
- クラトンの長期的安定に 関する過程を理解する.
- クラトンの定義を改め,メソプロテロゾイク期の安定した地殻領域を含める.
主な方法:
- ペリドライトの溶解残留物の分析
- 横向の蓄積と圧縮による石層の加厚をモデル化.
- 特定のプレカンブリア時代におけるクラトン組成の地質学的再構築.
主要な成果:
- クラトン岩層の根は,より深いところへ運ばれた低圧溶解残留物から発生する.
- 厚く安定したマントルの根 (150~250km) は,メソアルケアンとパラオプロテロゾイク時代に形成され,クレートンの保存に不可欠である.
- オーロゲニックの加厚は,潜在的に複数のサイクルで,広範囲で強い石層を生成するために不可欠です.
結論:
- 厚い岩層の根の形成は,クレートン形成と長寿と密接に関連しています.
- クラトンの定義は,厚い岩層のサポートを持つ安定したメソプロテロゾイク地域を含むように拡張できます.
- クラトンの進化を理解することで 安定した大陸の形成の洞察が得られます
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