南へ南へ南へ南へ南へ南へ南へ南へ南へ南へ南へ
Yi-Wei Chen1, Jonny Wu2, John Suppe2
1Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA. yiweichen.tw@gmail.com.
Nature
|January 25, 2019
まとめ
アンデス山脈の沈殿は 長い間継続的と考えられていましたが 実際にはエピソード的な分岐段階が含まれていました この研究は,ナズカプレート構造を再構築し,ナズカプレートと下層マントルの間の相互作用がアンデス圧縮と沈殿に影響を与えました.
科学分野:
- 地球科学
- 地質学
- プレート構造
背景:
- アンデス海域は長寿命の沈殿の重要な例です.
- メソゾイク時代以降の地質史は,エピソード的変形とマグマティズムによって特徴付けられています.
- 以前の説明はプレートダイナミクスを含んでいたが,プレート構造の役割,特に広範囲なナズカ・ファラロンプレート沈殿は不明のままだった.
研究 の 目的:
- プレート構造の幾何学を再構築する ナスカのスラブ 末期メソゾイク
- 継続的なナズカ潜水という パラダイムに挑戦するために
- ナスカの石版と アンデス山脈の地質現象の関連を調査する
主な方法:
- トモグラフィのデータを使って ナスカの岩盤をモデル化した
- メソゾイク期末以降のアンデスプレート構造を再構築した.
主要な成果:
- 現在進行中のナズカ沈殿は,白亜紀後期 (約1万年) に始まった. 8千万年前) の北アンデス山脈で南に広がった.
- ナズカの沈殿はケノゾイク初期 (約1万年) に南アンデスに到達した. 5500万年前まで遡ります)
- 連続した沈殿のパラダイムとは対照的に,ナズカ沈殿はエピソード的分岐段階を含んでいた.
結論:
- メソゾイク後期からアンデスプレート構造は安定状態ではなかった.
- ナスカの沈殿は 中世以来 連続ではなく 偶発的だった
- 深い沈殿とアンデス圧縮の開始は,ナスカのスラブと下層マントルの相互作用に関連しています.
関連する概念動画
Propagation of Waves
3.0K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
3.0K
Propagation of Action Potentials
9.4K
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
9.4K
Propagation of Uncertainty from Systematic Error
1.5K
The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
1.5K
Propagation of Uncertainty from Random Error
2.0K
An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
2.0K
Propagation Speed of Electromagnetic Waves
4.7K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
4.7K
Nucleosome Remodeling
11.1K
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
11.1K


