死海の下の境界層マントルの流れは,地震性アニソトロピーから推論された変形断層である
Georg Rümpker1, Trond Ryberg, Günter Bock
1GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany. rumpker@gfz-potsdam.de
Nature
|October 3, 2003
まとめ
研究者らは,死海変形の底深く,狭い20km幅の鉱物並びのゾーンを発見しました. この地殻下変形は,アフリカプレートとアラビアプレートの間のプレート運動に対応する.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- ミネラル物理学 ミネラル物理学
背景:
- リソスフィアスケールの変形断層は,地球板構造学にとって極めて重要です.
- 表面に近い変形はよく研究されていますが,地殻下変形は依然として十分に理解されていません.
- 重要な知識のギャップには,深層プレート境界の範囲,移行地帯,マントルの流れ相互作用が含まれています.
研究 の 目的:
- 死海の亜地殻石層内の変形を調査するために.
- 変形領域の幅と深さを決定する.
- リトスフィアのマントル流とアステノスフィアのマントル流との相互作用を理解するために.
主な方法:
- シーア波分裂観測を利用した.
- 密度の高い地震感受器プロファイルを使用した.
- 地震データを逆転して地殻下構造をイメージした.
主要な成果:
- 狭い,幅約20kmの亜地殻アニソトロピックゾーンが特定されました.
- このゾーン内で観測された断層並列の鉱物配列.
- リトスフィアの境界層内の推測された亜水平マントルの流れ.
結論:
- 死海変形は,狭くて深い石層の境界層を通って運動を収納します.
- 亜地殻の鉱物並びは,変換運動に対応する重要なマントルの流れを示しています.
- この研究は,主要な変換欠陥の深い構造と動態に関する新しい洞察を提供します.
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