Global data for measured Fe 2 O 3/FeO ratios and Cu contents in unaltered volcanic and
intrusive arc rocks indicate that, on average, they are slightly more oxidized than other …

Abstract The Middle-Lower Yangtze River Valley Metallogenic Belt (MLYB) is one of the
most important metallogenic belts in eastern China, and contains many important porphyry …

Abstract Epithermal Au and Ag deposits of both vein and bulk-tonnage styles may be
broadly grouped into high-, intermediate-, and low-sulfidation types based on the sulfidation …

Abstract The Central Asian Orogenic Belt (CAOB) hosts a number of porphyry Cu deposits,
all associated with calc-alkaline granitic rocks and ranging in size from giant to small. Major …

Eleven gold‐rich porphyry copper and 14 epithermal gold deposits around the Pacific rim
contain> 200 t (‐7 million oz) of gold. These large porphyry‐type deposits conform to a …

Gold-rich porphyry deposits worldwide conform well to a generalized descriptive model. This
model incorporates six main facies of hydrothermal alteration and mineralization, which are …

Crystallization experiments were carried out on a representative sample of the crystal-rich
dacite ejected during the 15 June 1991 eruption of Mt Pinatubo, to define the pre-eruption …

Mount Pinatubo in the Philippines, known for its cataclysmic eruption in 1991, hosts several
porphyry copper deposits and active geothermal systems. An underlying mafic melt supplied …

Piston cylinder experiments are used to investigate the effect of oxygen fugacity (ƒO 2) on
sulphur speciation and phase relations in arc magmas at 0.5–1.5 GPa and 840–950° C. The …

Emissions of sulphur, and metals, from magmas in Earth's shallow crust can have global
impacts on human society. Sulphur-bearing gases emitted into the atmosphere during …