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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
40Arの保持は,地上の惑星に存在しています.
E Bruce Watson1, Jay B Thomas, Daniele J Cherniak
1Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, USA. watsoe@rpi.edu
Nature
|September 21, 2007
まとめ
新しいデータによると,アルゴンは地球のマントルに留まっています. これは,マグマプロセスが40Arのようなガスを大気中に放出する主なメカニズムではないことを示唆しています.
科学分野:
- 地質化学 地質化学
- 惑星科学は惑星科学である.
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 固体地球は,早期の大惨事的な放出と進行中の地質学的プロセスを通して,原始的なガスを失っていると考えられています.
- 大気中の40Arの豊富さは,地球の内部からの時間統合ガス損失を推定するために伝統的に使用されています.
研究 の 目的:
- 40Ar.を放出する唯一のメカニズムとしてマグマの脱ガス化の適性を調査する.
- 40Ar.に関して脱ガスされた上層マントルの支配的な見解に異議を唱えるために.
主な方法:
- 主要な地上の惑星相におけるアルゴンの振る舞いの分析.
- 上層マントルの条件下でのアルゴンの拡散率の評価.
主要な成果:
- アルゴンは,主要な惑星の鉱物相の中で互換性を示す.
- アルゴンの拡散は,典型的な上層マントルの温度と圧力の下で遅い.
- これらの発見は,40Ar.の効率的なマグマ的脱ガス化の仮定と矛盾しています.
結論:
- 40Arの放出のための単純なマグマ的脱ガスモデルは不十分です.
- アルゴンの行動は,惑星の脱ガス化のための唯一のモニターとしての使用に挑戦しています.
- 海洋石層水分化などの代替メカニズムは,アルゴンの放出のために提案されています.
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