Concealed deep beneath the oceans is a carbon conveyor belt, propelled by plate tectonics.
Our understanding of its modern functioning is underpinned by direct observations, but its …

Kimberlites are volcanic rocks enriched in CO2 and H2O and derive from the deepest-
sourced melts (up to 300 km) that reach Earth's surface. The mantle processes that generate …

Diamond is not a common rock-forming mineral (an exception being “diamondite”; see
Jacob and Mikhail 2022, this volume) nor a common crustal mineral (the exceptions being …

Hypabyssal kimberlites are subvolcanic intrusive rocks crystallised from mantle-derived
magmas poor in SiO2 and rich in CO2 and H2O. They are complex, hybrid rocks containing …

The nature and cause of deep earthquakes remain enduring unknowns in the field of
seismology. We present new models of thermal structures of subducted slabs traced to …

Ca isotope geochemistry has great potential for improving our understanding of magmatic
systems and for tracing the deep Earth carbon cycle. There are still many open questions …

Sublithospheric diamonds and the inclusions they may carry crystallize in the
asthenosphere, transition zone, or uppermost lower mantle (from 300 to∼ 800 km), and are …

Abstract The Wombat and Giraffe kimberlite pipes in the Lac de Gras kimberlite field (64° N,
110° W) of the Northwest Territories, Canada, preserve unique post-eruptive lacustrine and …

We present a new S-wave velocity tomographic model of the upper mantle beneath the
Australian Plate and its boundaries that we call Aus22. It includes azimuthal anisotropy and …

Earth's carbon cycle is strongly influenced by subduction of sedimentary material into the
mantle. The composition of the sedimentary subduction flux has changed considerably over …