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 …

Inverse theory is used to calculate the melt distribution required to produce the rare earth
element concentrations in a wide variety of terrestrial and extra-terrestrial magmas. The …

This remarkable volume presents the first revision to the classification system of diamond-
bearing rocks in over eighty years. Presenting the latest mineralogical data, this book offers …

Small melt fractions very rich in potassium are likely to be present beneath the lithosphere,
and will separate from the matrix when there is more than 10− 3% melt present if their …

Abstract Late Cenozoic (< 17Ma) basaltic lavas were erupted in the Basin & Range Province
(BR), the transition zone (TZ) between the BR and the Colorado Plateau (CP), and the …

Micro-inclusions in diamonds from Zaire and Botswana differ in composition from the more
common large inclusions of the peridotitic or eclogitic assemblages. These sub-micrometre …

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 …

Cenozoic magmatic belt of central Iran originated as a continental arc in the early
Paleogene due to northeastward subduction of the Neo-Tethys lithosphere. In the Shahr e …