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Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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大陸の広がりはプレート・テクトニクスの始まりとなった.

Patrice F Rey1, Nicolas Coltice2, Nicolas Flament1

  • 1Earthbyte Research Group, School of Geosciences, The University of Sydney, Sydney NSW 2006, Australia.

Nature
|September 19, 2014
PubMed
まとめ
この要約は機械生成です。

初期の大陸は,重力による広がりによって,沈殿とプレート構造をはじめたのかもしれない. 厚く浮遊する海殻によって引き起こされるこのプロセスは,地球が冷却され,プレート構造が自給自足するようになるまで,古代の地質学的記録を説明しています.

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科学分野:

  • 地球科学 地球科学 地球科学
  • ジオダイナミクスは地力学です.
  • プレート・テクトニクス (プレート・テクトニクス)

背景:

  • サブドクションの開始とプレート構造は,地球の地力学にとって非常に重要です.
  • 古代地球のより熱い内部は,より厚く,より浮遊力のある海洋地殻をもたらし,初期の沈下を曖昧なものにした可能性があります.
  • 古代のプレート構造の地質学と地動力学的記録は依然として議論されている.

研究 の 目的:

  • サブドクションとプレート構造の開始における初期の大陸の役割を調査する.
  • アルカイア紀のクラトンにおける多様性火山活動と地質学記録を説明するために.
  • ジオダイナミックモデルと古代の地質学的証拠を調和させる.

主な方法:

  • 厚く浮遊する海殻と初期の大陸構造を組み込んだ地動力学モデルを開発した.
  • シミュレートされた岩層内重力張力とその大陸の広がりと沈下の開始への影響.
  • モデル予測をアーカイアークラトンからの地質学,クセノリシス,地震データと比較した.

主要な成果:

  • 初期の大陸は,重力拡散のために十分な石層内ストレスを発生させ,マージンシブダクションを開始しました.
  • このモデルは,大陸内の深層と浅層のマフィカル火山と弧状マグマティズムが同時に発生することを説明します.
  • 地質学的層分化と地質学的な構造を予測した亜大陸の石層マントルの構造は,地震とクセノリスの研究と一致する.

結論:

  • 初期の大陸の重力崩壊は,プレート構造の一時的なエピソードを開始した可能性がある.
  • このメカニズムは,古代の地動力学と地質学的特徴を理解するための自己一貫した枠組みを提供します.
  • 地球が冷却するにつれて,海洋の石層は密度が高くなり,自給自足のプレート構造の確立につながった.