The oxidation state, and sulfur and Cu contents of arc magmas: implications for metallogeny

JP Richards - Lithos, 2015 - Elsevier
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 …

Adakite petrogenesis

PR Castillo - Lithos, 2012 - Elsevier
Adakite was originally proposed as a genetic term to define intermediate to high-silica, high
Sr/Y and La/Yb volcanic and plutonic rocks derived from melting of the basaltic portion of …

Magmatic to hydrothermal metal fluxes in convergent and collided margins

JP Richards - Ore Geology Reviews, 2011 - Elsevier
Metals such as Cu, Mo, Au, Sn, and W in porphyry and related epithermal mineral deposits
are derived predominantly from the associated magmas, via magmatic–hydrothermal fluids …

How important is the role of crystal fractionation in making intermediate magmas? Insights from Zr and P systematics

CTA Lee, O Bachmann - Earth and Planetary Science Letters, 2014 - Elsevier
Most magmatism on Earth forms by direct melting of the mantle, generating basalts at the
low silica end of the terrestrial compositional spectrum. However, most subduction zone …

The transport of water in subduction zones

YF Zheng, RX Chen, Z Xu, SB Zhang - Science China Earth Sciences, 2016 - Springer
The transport of water from subducting crust into the mantle is mainly dictated by the stability
of hydrous minerals in subduction zones. The thermal structure of subduction zones is a key …

High Sr/Y arc magmas and porphyry Cu±Mo±Au deposits: Just add water

JP Richards - Economic Geology, 2011 - pubs.geoscienceworld.org
Abstract Porphyry Cu±Mo±Au deposits are commonly associated with intermediate
composition arc-related igneous rocks with high Sr/Y (and La/Yb) ratios, and such rocks are …

Tectono-magmatic precursors for porphyry Cu-(Mo-Au) deposit formation

JP Richards - Economic geology, 2003 - pubs.geoscienceworld.org
Abstract Porphyry Cu-(Mo-Au) deposits are relatively rare but reproducible products of
subduction-related magmatism. No unique processes appear to be required for their …

Adakites without slab melting: high pressure differentiation of island arc magma, Mindanao, the Philippines

CG Macpherson, ST Dreher, MF Thirlwall - Earth and Planetary Science …, 2006 - Elsevier
New geochemical data for Pleistocene magmatic rocks from the Surigao peninsula, eastern
Mindanao, the Philippines, demonstrate typical adakitic traits, including elevation of Sr/Y and …

Special paper: adakite-like rocks: their diverse origins and questionable role in metallogenesis

JP Richards, R Kerrich - Economic geology, 2007 - pubs.geoscienceworld.org
Based on a compilation of published sources, rocks referred to as adakites show the
following geochemical and isotopic characteristics: SiO2≥ 56 wt percent, Al2O3≥ 15 wt …

The global systematics of primitive arc melts

MW Schmidt, O Jagoutz - Geochemistry, Geophysics …, 2017 - Wiley Online Library
We extracted all volcanic arc rock analyses calculated to be in equilibrium with mantle
olivine from the global georoc database. This results in 938 primitive melt compositions from …