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 …

▪ Abstract Mantle plumes are recognized by domal uplift, triple junction rifting, and especially
the presence of a large igneous province (LIP), dominated in the Phanerozoic by flood …

This textbook is a complete rewrite, and expansion of Hugh Rollinson's highly successful
1993 book Using Geochemical Data: Evaluation, Presentation, Interpretation. Rollinson and …

Using Geochemical Data: Evaluation, Presentation, Interpretation Page 1 Page 2 Using
Geochemical Data: Evaluation, Presentation, Interpretation Page 3 Other titles in the series An …

Trace-element data for mid-ocean ridge basalts (MORBs) and ocean island basalts (OIB)
are used to formulate chemical systematics for oceanic basalts. The data suggest that the …

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 paper attempts to bridge this gap by presenting a User's Guide to, basalt discrimination
器 diagrams. It first deals with the requirements of sample collection, geochemical analysis …

Mid-ocean ridge basalts (MORB) are a consequence of pressure-release melting beneath
ocean ridges, and contain much information concerning melt formation, melt migration and …

This substantially revised edition includes recently published information relating to plate
tectonics and continental origin. A large number of new figures have been added, and new …

Stratigraphic data and 40 Ar-39Ar ages for the Early Cretaceous Paraná-Etendeka flood
basalts indicate that the main magmatic episode lasted for several my (129–134 Ma) and …