Tectonic discrimination diagrams are a key tool for understanding ancient volcanic rock
origins. In this contribution we compile over 15,000 whole rock compositions to re-evaluate …

Arc magmas, the building blocks of continental crust, are depleted in total iron (Fe), have
higher ratios of oxidized Fe to total Fe (Fe3+/∑ Fe), and record higher oxygen fugacities (f …

The valence state of iron in mantle-derived melts, such as mid-ocean ridge basalt, is a useful
proxy for oxygen fugacity (ƒ O2). On subduction, oceanic crust undergoes metamorphic …

Cratonic eclogite is the product of oceanic crust subduction into the subcontinental
lithospheric mantle, and it also is a fertile diamond source rock. In contrast to matrix minerals …

Resolving the geochemical discrepancies in Nb/Ta between the bulk continental crust and
its parental mantle melts can provide insights into the processes by which basaltic magmas …

Vanadium is a multivalent element that may speciate as V2+; V3+; V4+ and V5+ in silicate
and oxide phases. The relative abundance of V in planetary materials can be used as a …

Mining and exploration companies routinely use four-acid digestion (4AD), inductively
coupled plasma, atomic emission spectra/mass spectrometry methods from commercial …

As an early crystallizing phase in the magma, apatite can accommodate a wide range of
multivalent cations and has a capacity resistant to weathering and hydrothermal alteration …

Sixty-eight new experiments on rutile solubility in synthetic silicate melts of a wide
compositional range have been conducted at ambient pressure (P) at temperature (T) from …

Rutile, titanite, and ilmenite are the most common Ti-bearing minerals in metamorphic rocks.
Experimental constraints have shown that titanite is stable at low-grade metamorphic …