後期タルシスの形成と初期の火星への影響
Sylvain Bouley1,2, David Baratoux3,4, Isamu Matsuyama5
1GEOPS-Géosciences Paris Sud, Université Paris-Sud, CNRS, Université Paris-Saclay, Rue du Belvédère, Bâtiment 504-509, 91405 Orsay, France.
Nature
|March 3, 2016
まとめ
火星のタルシスの火山地帯は 初期の渓谷ネットワークに影響を及ぼさなかったかもしれません 新しいモデルは,タルシスの形成前の地形が,初期の火星の谷の方向と水の分布を説明することを示唆しています.
科学分野:
- 惑星科学
- 地質学
- 気候科学
背景:
- 火星のタルシス地域は 太陽系最大の火山群で 数十億年にわたって成長しました
- その巨大な質量は,火星を方向転換し,赤道近くのタルシスを位置づけ,真の極流動 (TPW) を引き起こしたと考えられています.
- 初期の火星の渓谷ネットワークの方向性に 影響を与えた.
研究 の 目的:
- 火星の初期の渓谷ネットワークの方向性に対する タルシスの火山の負荷の影響を調査する.
- 火星の地形と回転図を 再構築する タルシス地域が形成される前に
- 観測された谷のネットワークパターンを説明できるかどうかをテストする.
主な方法:
- タルシスの形成前の火星の回転形 (平衡形) を計算した.
- ターシス以前の状態で 惑星の地形を再構築した
- トポグラフィック・グラディエントを分析し,観察された渓谷ネットワークの方向性と比較した.
主要な成果:
- 観測された渓谷ネットワークの方向は,タルシスの負荷が存在する前に火星上の地形グラデーションと一致しています.
- 谷の分布は,南半球の緯度帯とTPW前フレームに一致しています.
- 気候モデルは,TPW以前の地形に基づいて,この帯域における好ましい氷/水の蓄積を予測しています.
結論:
- 初期の火星の谷のネットワークの方向性を説明するには,タルシスの負荷は必要ありません.
- 谷の切断と並行した タルシスの後期的な成長段階は 初期の火星の地質学と気候に 重要な意味を持ちます
- この改訂されたタイムラインは 潜在的氷河環境を示唆し,火山からの放気と地表水の安定性を関連付けています.
関連する概念動画
Conditions on Early Earth
2.9K
2.9K
Conditions on Early Earth
103.1K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
103.1K
Impact: Problem Solving
496
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
496
Functional Brain Systems: Reticular Formation
5.9K
The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
5.9K
Surface Appendages of Archaea
828
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
828
Acceleration due to Gravity on Other Planets
5.1K
The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
5.1K


