Peralkaline rocks include those igneous rocks which have a deficiency of aluminium such that sodium and potassium are in excess of that needed for feldspar. The presence of aegerine …

過鹼性岩石 （英語： Peralkaline rock）是指缺乏鋁的火成岩。 它們的鈉和鉀的含量超過了形成 長石 所需的含量。 通常岩石有霓石 (aegerine)和铁钠闪石 (riebeckite)就代表過鹼性的地質環境 …

过碱性岩石 （英语： Peralkaline rock）是指缺乏铝的火成岩。 它们的钠和钾的含量超过了形成 长石 所需的含量。 通常岩石有霓石 (aegerine)和铁钠闪石 (riebeckite)就代表过碱性的地质环境 …

Peralkaline rocks are defined by a high (Na + K)/Al ratio, and they include various types of silica-rich intrusive and extrusive rocks. These rocks are characterized by their enrichment in alkalis, …

Peralkaline rocks are those that are oversaturated with alkalies (Na 2 O + K 2 O), and thus undersaturated with respect to Al 2 O 3. On a molecular basis, these rocks show: Al 2 O 3 < …

2016年1月1日 · Highly evolved alkaline/peralkaline igneous rocks host deposits of rare earth elements (REE), including Y as well as Zr, Hf, Nb, Ta, U, and Th. The host rocks spanning …

Peralkaline silicic extrusive rocks play important roles in many aspects of volcanology, petrology, geochemistry, economic geology and volcanic hazards. (1) They can form large volumes of …

2023年8月18日 · Peralkaline granitic rocks are relatively rare rock-types, which are commonly enriched in rare elements (rare earth elements (REE), radioactive elements (uranium and …

Peralkaline rocks are characterized by abnormal concentrations of rare elements, such as Zr, and the halogens F and Cl. Peralkalinity is most common in felsic rocks, giving rise to peralkaline …

2008年4月25日 · The Eocene Tamazeght complex, High Atlas Mountains, Morocco is a multiphase alkaline to peralkaline intrusive complex. A large variety of rock types (including …