A definition for ultrapotassic rocks is introduced using the chemical screens K 2 O> 3 wt.%,
MgO> 3 wt.% and K 2 O/Na 2 O> 2 for whole-rock analyses. On this basis a data base of …

Lamprophyres are 'alkaline rocks' because they carry high alkalis at a given percentage of
SiO2, together with one or more of normative ne, lc or ac, modal foids, and Na-K-Ti-rich …

A map of the ocean basins (Fig. 5.1) shows that their most conspicuous topographic feature
is the system of mid-oceanic ridges, the crests of which rise on average 1000-3000 m above …

Major and trace element, Sr–Nd–Pb–O isotope and mineral chemical data are presented for
post-collisional ultrapotassic, silicic potassic and high-K calc-alkaline volcanic rocks from …

Italian Plio-Quaternary magmatism exhibits a very wide petrological, geochemical and
radiogenic-isotope variability, which makes magma genesis and geodynamic significance …

Post-collisional magmatism in the southern Iberian and northwestern African continental
margins contains important clues for the understanding of a possible causal connection …

High-MgO ultrapotassic rocks are found in four different areas of the Western Mediterranean
basin associated in space and time with shoshonitic and calc-alkaline rocks. They represent …

In this paper the geological occurrence, geochemistry and mineralogy of ultrapotassic
(K2O/Na2O> 3 (molar ratio)) and perpotassic (K2O/Al2O3> 1 (molar ratio)) igneous rocks …

Extensional collapse of the Betic–Alboran Domain in the Miocene was accompanied by
several discrete episodes of magmatism which provide insights into the relationships …

Abstract The Sulphide Queen carbonatite, which contains the rare-earth orebody at
Mountain Pass in California, is a moderately dipping tabular intrusion associated with 1.40 …