peralkaline

peralkaline

[pər′al·kə‚līn]
(petrology)
Of igneous rock, having a molecular proportion of aluminum lower than that of sodium oxide and potassium oxide combined.
References in periodicals archive ?
see: June 13, 2013: Technical Report on the Foxtrot Project - updated Preliminary Economic Assessment (NI 43-101 Report on SEDAR) This resource occurs in peralkaline felsic volcanic rocks that form a 62 km-long belt from near St.
Aluto Volcano is an active, peralkaline rhyolitic complex of Quaternary age, which is characterized by numerous rhyolitic domes forming a 6x9 km large caldera ring structure.
They also provide a good explanation of where REEs tend to be located, from iron and carbonatite deposits to lateritic, placer, peralkaline, vein, and other deposits.
Geology and Mineralization Norra Karr is a zirconium and rare earth element enriched peralkaline (agpaitic) nepheline syenite intrusion which covers 350m x 1200m in area.
REEs can only be found in two types of rocks: carbonatite and peralkaline, one of 17 found in the periodic table.
335 Ma Cumberland Hill Formation of southern New Brunswick consist of peralkaline rhyolite and trachyte.
None of the samples show a peralkaline character as described for the Arequita Formation by Muzio et al.
This paper details the first evidence for peralkaline Eastern Anatolian obsidians at Catalhoyuk, this being the furthest west such materials have been found.
All of the prospects are located within, or proximal to, a Jurassic-aged, multiphase, peralkaline intrusive complex.
2] conditions, slightly Ne-normative basalts can yield highly evolved peralkaline, Hy- and Q-normative trachytes through a two-stage fractionation process occurring in deep and then shallow-level magma chambers.
The "younger" Devonian event is characterized by intrusion of peralkaline, metaluminous, and peraluminous granitoid stocks and batholiths.