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GRAIL重力データによって明らかになった月のプロセララム領域の構造と進化
Jeffrey C Andrews-Hanna1, Jonathan Besserer2, James W Head3
1Department of Geophysics and Center for Space Resources, Colorado School of Mines, Golden, Colorado 80401, USA.
Nature
|October 4, 2014
まとめ
プロセララム (Procellarum) 地域について
科学分野:
- 月面地質学 月面地質学
- 地質物理学 地質物理学とは地質物理学です.
- 惑星科学は惑星科学である.
背景:
- 月面近辺のプロセララム地域は,低地,薄い地殻,熱生成元素の濃度が高い.
- 以前の解釈では,これは古代の衝突盆地であったが,地表の証拠は年齢と保存状態の不良によって隠されている.
研究 の 目的:
- グラビティ・リカバリー・アンド・インテリア・ラボラトリー (GRAIL) ミッションからのデータを用いて,プロセララム地域の地下構造を調べる.
- プロセララム地域の地質的起源を再評価する.
主な方法:
- GRAILミッションデータからのブーゲーの重力異常と重力グラデーションの分析.
- 重力データによって明らかになった地下構造の解釈.
主要な成果:
- GRAILのデータは,プロセララムに接する線形異常を明らかにし,古代の溶岩で満たされた裂け目とフィーダーダイクとして解釈されています.
- これらの構造は,衝突盆地の予想される円形の形ではなく,準長方形のパターンを形成します.
- 以前は衝突盆の縁と考えられていた地表の特徴は,この連続したマグマ・テクトニックシステムの一部です.
結論:
- Procellarum領域の境界構造は,原始的にマグマ・テクトニックであり,衝突盆地からのものではない.
- その形成は,高熱流によって引き起こされる微分冷却による熱的ストレスと,高熱流によって引き起こされるマグマ活動と関連している.
- これは,月の火山と地質学の歴史に関する新しい洞察を提供します.
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