プレート屈曲への反応として発生した火山
Naoto Hirano1, Eiichi Takahashi, Junji Yamamoto
1Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan. nhirano@ucsd.edu
まとめ
新しい研究により,太平洋プレートにおける新しいタイプの火山活動が特定され,既知の構造構造とは無関係である. この発見は,石層の断裂に沿ったアステノスフィアの溶融から形成された小さなアルカリ性火山を明らかにしています.
科学分野:
- 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.
- プレート・テクトニクス (プレート・テクトニクス)
背景:
- 地球の火山活動は,伝統的に3つの主要な地質学的な設定と結びついています:分岐板の境界,収束板の境界,およびホットスポット.
- 1億3,500万年前の太平洋プレートには,これらの確立されたカテゴリーに適合しない火山活動があります.
研究 の 目的:
- 太平洋プレートにおける新たに特定されたタイプの火山活動を特徴づける.
- これらの異常な火山の起源と形成メカニズムを調査する.
主な方法:
- 火山岩の微量元素地化学の分析. 火山岩の微量元素地化学の分析.
- 高貴ガスの同位体組成分析.
- 地質的地図作成と火山の特徴の年齢進行に関する研究.
主要な成果:
- 太平洋プレート上の小さなアルカリ性火山の特定.
- 証拠によると,アステノスフィアで発生した溶融のわずかなパーセントから形成されたことを示唆しています.
- 火山は,石層の裂け目に沿って噴火し,潜水中のプレート屈曲によって引き起こされる可能性があります.
結論:
- この火山活動は,第4の構造構造の設定を表しており,分散,収束,ホットスポット設定とは異なります.
- 小規模なアステノスフィアの融解と特定の火山の並びは,提案された形成メカニズムを支持する.
- この発見は,火山の過程とプレート構造の理解を広げています.
関連する概念動画
Reaction Mechanisms
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
Actin Filament Depolymerization
Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
In F-actin, the ADF/cofilin proteins...
Destabilization of Microtubules
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
Magnetic Damping
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Support Reactions in Three Dimensions
Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
Ball and Socket Joint is one of the supports allowing free rotation about any axis. This freedom of rotation is...
Ball and Socket Joint is one of the supports allowing free rotation about any axis. This freedom of rotation is...


