関連する実験動画
Updated: May 17, 2026

06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
太陽系原惑星円盤の固体の絶対的な年代順と熱処理
James N Connelly1, Martin Bizzarro, Alexander N Krot
1Centre for Star and Planet Formation and Natural History Museum of Denmark, University of Copenhagen, DK-1350 Copenhagen, Denmark. connelly@snm.ku.dk
まとめ
カルシウムとアルミニウムが豊富なインクルージョン (CAI) とコンドルールは,太陽系初期に一緒に形成されました. 彼らの形成は,同様の短い期間に発生し,タイムギャップに関する以前の考えに挑戦しました.
科学分野:
- 宇宙進化の宇宙進化について
- 惑星科学は惑星科学である.
- ジオクロノロジー (Geochronology) について
背景:
- カルシウムとアルミニウムが豊富なインクルージョン (CAI) とコンドルールの形成は,初期の太陽系における重要な出来事です.
- これらの出来事の正確なタイミングを理解することは,太陽系の進化モデルにとって極めて重要です.
- 以前の研究では,CAIとコンドルル形成の間の時間的ギャップが示唆されていた.
研究 の 目的:
- 個々のCAIとchondrulesの絶対年齢を決定する.
- CAIとコンドルル形成の間の時間的関係を確立するために.
- 太陽系原惑星円盤の進化のモデルを精錬する.
主な方法:
- U修正鉛-鉛 (Pb-Pb) 年代測定法を使用した.
- 原始的な隕石からの個々のCAIとコンドルルを分析した.
- 高精度地質年代分析を応用した.
主要な成果:
- CAIは,4567.30 ± 0.16百万年前に狭い間隔で形成されました.
- コンドルルの形成は4567.32 ± 0.42から4564.71 ± 0.30百万年前に続いた.
- コンドルル形成は,CAIと同時に始まり,約300万年間続いた.
結論:
- この研究は,CAIとコンドルルとの間の年齢差を否定している.
- CAIとコンドルル形成は重複し,同時進行するプロセスでした.
- 観測されたタイムスケールは,推論された太陽円盤の寿命と一致しており,円盤の進化とのつながりを示唆しています.
関連する概念動画
Isothermal Processes
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
Conditions on Early Earth
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.
Conditions on Early Earth
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.
Thermodynamic Processes
A thermodynamic process is a path through a sequence of states that takes a system from an initial state to a final state. In a cyclic process, the system returns to its initial state, so the changes in state properties and state functions (ΔT, Δp, ΔV, ΔU, ΔH) over one complete cycle are zero. However, heat and work transfers can still occur during the cycle, and the net heat and net work over the cycle need not be zero.A reversible process occurs when the system is infinitesimally close to...
Thermodynamic Background
The law of mass action states that "the rate of a chemical reaction is directly proportional to the product of the molar concentrations of the reactants." It means that the more 'active mass' or 'concentration' of the reactants present, the faster the reaction will proceed.In a chemical reaction, there are forward and reverse reactions. The forward reaction is the process where the reactants combine to form products. The reverse reaction is the process where the products break down to form the...
Thermal Sigmatropic Reactions: Overview
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...

