Fluids in Subduction Zone Rocks

Fluids in Subduction Zone Rocks


201 Main Lecture Theatre, Grant Institute


Thursday, January 17, 2019 (All day)


Prof Marco Scambelluri Dipartimento di Scienze della terra, dell'ambiente e della vita (DISTAV) Università degli Studi di Genova

It is now ascertained that fluids are essential to metamorphism, especially in subduction zones, where they affect the properties and physical-chemical behavior of the subduction interface and of the mantle wedge. Subduction of variably oxidized, volatile- and incompatible element-rich oceanic lithosphere is accompanied by dehydration of various rock types at different P-T conditions. Here emphasis is placed on serpentinite as volatile and fluid-mobile element repository. The analysis of fluid-related inclusions in de-serpentinized meta-peridotite unexpectedly revealed abundant halogen and fluid-mobile element concentrations in the fluid, which shows a hybrid component (serpentine + sediment) uptaken by the original serpentinite by interacting with sediment-derived fluids in the subduction zone. Much work is still necessary to define the physical and chemical process attending rock dehydration, fluid/rock interaction, and to define the potential of subduction fluids in affecting the composition and redox of the mantle wedge.

Organised by : 

Cees-Jan De Hoog