The geochemical signatures of subducting crust have been identified in various types of
mafic igneous rocks at convergent plate boundaries, where island arc basalts (IAB) and …

The thermal structure of subduction zones is fundamental to our understanding of the
physical and chemical processes that occur at active convergent plate margins. These …

Water within the oceanic lithosphere is returned to Earth's surface at subduction zones.
Observations of metamorphosed veins preserved in exhumed slabs suggest that fluid can …

Arc magmas globally are H2O-Cl-S–rich and moderately oxidized (ΔFMQ=+ 1 to+ 2) relative
to most other mantle-derived magmas (ΔFMQ≤ 0). Their relatively high oxidation state limits …

This chapter reviews recycling of boron (B) and its isotopes in subduction zones. It discusses
the profound changes in B concentrations and B isotope ratios of various materials involved …

When and how continental crust formed and evolved to its current state is a fundamental
question regarding crust–mantle evolution and geodynamic regimes on the early Earth …

Water strongly influences the physical properties of the mantle and enhances its ability to
melt or convect. Its presence can also be used to trace recycling of surface reservoirs down …

Volatile and stable isotope data provide tests of mantle processes that give rise to mantle
heterogeneity. New data on enriched mid‐oceanic ridge basalts (MORB) show a diversity of …

The oceanic crust that enters a subduction zone is generally recycled to great depth. In rare
and punctuated episodes, however, blueschists and eclogites derived from subducted …

Presented here is a suite of new experiments aimed at quantifying the effects of pressure,
temperature, bulk composition, and H 2 O content on the stability and composition of …