初期と後半のアルカリ性イグネアスパルスと高-3Heの羽根源はデッカンの洪水ベースタルトの起源です
まとめ
インドのアルカリ性火性複合体.
科学分野:
- 地質化学 地質化学
- イソトープ地球化学 イソトープ地球化学
- イグネウス Petrology (イグネウス・ペトロロジー) とは,イグネウス・ペトロロジー (イグネウス・ペトロロジー) とは
背景:
- インドのデッカン大陸浸水玄武岩 (CFB) 州は,高熱流と重力異常を呈しています.
- ネフェリニット-カルボナイトの類似性のアルカリ性火性複合体は,デッカン CFB 県内の拡張地帯で見つかりました.
研究 の 目的:
- デッカン CFB省に関連するマグマティズムのタイミングと性質を調査する.
- デッカンのCFB噴火に先立つマントルの羽根の動態を理解するために.
主な方法:
- アルガン-アルゴン (40Ar/39Ar) 年代測定は,アルカリ複合体からのバイオタイトサンプルによるものです.
- ヒリウム (3He/4He) とストロンチウム (87Sr/86Sr) の同位体比を含む地化学分析.
主要な成果:
- バイオタイトによる年代測定により,2つの異なるマグマ脈動が明らかになった. 1つは68.6万年前,もう1つは65.0万年前.
- 古い複合体は,高い3He/4He比率 (14.0倍の空気) と,海洋島の玄武岩に似た Sr同位体シグネチャーを示しています.
- 後期のパルスでは,地殻の汚染の証拠が示されています.
結論:
- デッカンのCFB火山は,マントルの羽根の育種が約350万年に先行した.
- 初期のマグマ的段階では原始的なマントルの羽根の特徴が保存されています.
- 地殻の相互作用は,Deccan州内の後のマグマ活動に影響を与えました.
関連する概念動画
Qualitative Analysis
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
Alkali Metals
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
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...
Washing, Drying, and Ignition of Precipitates
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Gravimetry: Inorganic And Organic Precipitating Agents
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...


