金星の地質学:マジェランからの初期分析

S C Solomon, J W Head, W M Kaula

Science (New York, N.Y.)

|April 12, 1991

まとめ

マジェラン探査のデータは,金星の表面変形が多様で,地殻がマントルの動力に反応していることを示している. 構造的な特徴は,地球とは異なり,広範なストレートゾーンを示しています.

科学分野:

惑星科学は惑星科学である.
地質学地質学地質学
地質物理学地質物理学とは地質物理学です.

背景:

金星は,平原,帯,山帯,コロナ,裂け目帯を含む複雑な表面変形を示しています.
以前の研究では,地表構造と金星のマントルのダイナミクスとの関連が示唆されていた.

研究の目的:

マジェランミッションのレーダー画像と高度測定データを分析するために.
金星の変形特徴の多様性と空間的スケールを特徴づけること.
金星の地質学を駆動する地質学的過程を推論する.

主な方法:

マジェランのレーダー画像データの分析.
マジェランの高度測定データによる解釈.
構造上の特徴 (例えば,断層,折りたたみ,裂け目) のマッピングと特徴付け.

主要な成果:

ヴェヌスの平原は,重ね合わせの変形と火山活動を示し,ストレスは広範囲に広がり,特定のゾーンに集中しています.
ストレインパターンは,マントルのダイナミックなプロセスに対する地殻の反応を示唆する.
山岳帯は圧縮,加厚,伸縮,崩壊を呈する.
リトスフィアの拡張は,準円形のコロナで発生し,火山活動に関連した線形裂け目を持つ広い上昇が発生します.
構造的な特徴は,地球上の海洋構造と異なる,広範囲で数百キロメートルのストレートゾーンによって特徴付けられています.

結論:

金星の地質学は,マントルの動力学によって駆動され,その結果,広範囲にわたる地殻変形が発生します.
観測された変形パターン,特に広範なストレートゾーンは,金星と地球の海洋地域を区別する.
マントルのコンベクションと金星の表面構造の相互作用を完全に理解するには,さらなる研究が必要です.

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