まとめ
オブシディアン水酸化年代測定は,今や,玄武岩の流れと爆弾の年齢を決定するために使用することができます. この方法は,リメルトされたリオライトガラスを含んだ火山岩で有効です.
科学分野:
- 地質学 地質学 地質学
- ジオクロノロジー (Geochronology) について
- 火山学 火山学とは
背景:
- バサルトの火山岩は,世界中で一般的です.
- 火山岩の年代測定は,噴火の歴史と地質学的プロセスに関する重要な情報を提供します.
- 玄武岩内のリオリティックガラスのインクルージョンは,ユニークな年代測定の機会を提供することができます.
研究 の 目的:
- ベースルティック材料の有効な方法として,オブシディアンの水分年代測定を確立する.
- ベースルトの流れや,リメルトされたリオライトガラスを含んだ爆弾の年齢を決定するために.
主な方法:
- オブシディアン水酸化年代測定技術は,玄武岩の流れと爆弾のサンプルに適用されます.
- ベースアルティックマトリックス内の再溶融されたリオライトガラスのインクルージョンの分析.
主要な成果:
- 玄武岩のサンプルにオブシディアンの水分化を成功裏に適用した.
- 再融解されたリオライトガラスのインクルージョンから得られた定量年齢データ.
結論:
- オブシディアン水酸化年代測定は,ベースルトの流れと,適切なガラスインクルージョンを持つ爆弾の年代測定に有効です.
- このテクニックは,火山学研究におけるオブシディアン水分年代測定の適用範囲を拡大します.
関連する概念動画
Radioactive Decay and Radiometric Dating
Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
Hydration of Cement
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
Volatilization
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
Porosity and Absorption of Aggregate
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the aggregate...
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the aggregate...
Alkali Aggregate Reaction in Concrete
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
Specific Gravity of Aggregate
Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...


