Definition of Peralkaline. Meaning of Peralkaline. Synonyms of Peralkaline

- Peralkaline rocks include those igneous rocks which have a deficiency of aluminium such that sodium and pot****ium are in excess of that needed for feldspar...
- and lithophysal structures. Some rhyolite is highly vesicular pumice. Peralkaline rhyolites (rhyolites unusually rich in alkali metals) include comendite...
- Volcanic rocks are also broadly divided into subalkaline, alkaline, and peralkaline volcanic rocks. Subalkaline rocks are defined as rocks in which SiO2...
- 230,000 tonnes. The island is the type locality for pantellerite, a peralkaline rhyolite. Pantelleria has a subtropical Mediterranean climate (Köppen:...
- composition Comendite – Hard, peralkaline igneous rock, a type of light blue grey rhyolite Pantellerite – Peralkaline rhyolite type of volcanic rock...
- All these rocks appear to have a common origin and define an alkaline–peralkaline suite. Phenocrysts include mainly plagioclase, with less common olivine...
- Pantellerite is a type of volcanic rock, specifically a peralkaline rhyolite. It has a higher iron and lower aluminium composition than comendite. It...
- Crustal Recycling Recorded in Ternary Feldspar from Compositionally Zoned Peralkaline Ignimbrite A', Gran Canaria, Canary Islands". Journal of Petrology. 43...
- the alkali oxides as feldspar (Al2O3 < K2O + Na2O) are described as peralkaline, and they contain unusual sodium amphiboles such as riebeckite. Granites...
- classification include: Ultrapot****ic – rocks containing molar K2O/Na2O >3. Peralkaline – rocks containing molar (K2O + Na2O)/Al2O3 >1. Peraluminous – rocks...