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 …

Diamond is not a common rock-forming mineral (an exception being “diamondite”; see
Jacob and Mikhail 2022, this volume) nor a common crustal mineral (the exceptions being …

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 …

This is a book about the petrology of kimberlites. It is not about upper mantle xenoliths,
diamonds, or prospecting for kimberlites. The object of the book is to provide a …

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 …

Although most economic geology research is concentrated at the deposit or mineral-system
scale for a single well-defined deposit group with a consistent metal association, there are …

The source mineralogy and conditions of origin of the three main groups of ultrapotassic
rocks are outlined by combining experimental constraints and an abstraction of evidence …

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 …

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 …

The extent of control of Ti, Nb and Ta concentrations by residual titanate minerals in island
arc and subcontinental mantle enrichment processes is assessed with reference to recent …