Peralkaline igneous rocks are defined by a molar (Na+ K)/Al ratio> 1 and are subdivided into
miaskitic and agpaitic varieties depending on their mineralogy. In the more common …

The following article presents constraints of the stability of Mg-rich (Mg/(Mg+ Fe 2+)> 0.5)
calcic amphibole in both calc-alkaline and alkaline magmas, testing of previous …

The oceanic-island magmatic systems of the Atlantic Ocean exhibit significant diversity in
their respective sizes, ages, and the compositional ranges of their eruptive products …

Geochemically, the large family of alkaline plutonic rocks (both Qtz-undersaturated and-
oversaturated compositions) can be subdivided into metaluminous [(Na2O+ K2O)< Al2O3] …

Furnas is one of three active central volcanoes on São Miguel Island, Azores, and is
considered to be one of the most hazardous in the archipelago. In this study, the pre …

The cation distribution among the A, B, C, and D sites of 13 crystals of chevkinite-(Ce) by X-
ray single-crystal diffraction and electron microprobe analyses is reported in this article. The …

The chevkinite-group minerals (CGM) are dominantly monoclinic REE-Ti-Fe sorosilicates
[(REE, Ca) 4Fe2+ (Fe2+, Fe3+, Ti) 2Ti2 (Si2O7) 2O8)], with REE2O3 contents up to~ 50 …

Mineral chemistry, textures and geochemistry of syenite autoliths from Kilombe volcano
indicate that they crystallized in the upper parts of a magma chamber from peralkaline …

ABSTRACT The Eocene Tamazeght (or Tamazert) complex, situated in the High Atlas
Mountains of Morocco, comprises a suite of ultramafic to syenitic alkaline to peralkaline units …

Eudialyte-group minerals (EGMs) are typical accessory or rock-forming minerals of the
Lovozero peralkaline massif (Kola Peninsula, Russia). The EGM grains in the rocks of the …