Serpentinization is a mantle hydration reaction of major interest because of its implication in the evolution of rifted margins, mid-ocean ridges, and subduction zones. Serpentinization leads to weak hydrous minerals crystallization that yields to a reduction in the friction coefficient and an increase in the volume of mantle rock.

In rifted margins and mid-ocean ridges, weak serpentinized peridotite and serpentinization-driven fluid overpressure are known to have a critical role in the kinematics of low-angle detachment faulting that exposes mantle lithology to the seafloor. At mid-ocean ridges, these low-angle structures control the formation of oceanic core complexes, while at rifted margins control the exhumation of large portions of sub-continental mantle. Serpentinization is also an exothermic reaction that can produce significant heat and derive serpentinite hosted hydrothermal systems, and thus impact the submarine ecosystems.
In subduction zones, crustal-scale normal faulting associated with the bending of the incoming oceanic plate at the outer rise enables water percolation to the oceanic mantle, triggering serpentinization. Multi-stage fluid release from the subducting slab caused by the breakdown of hydrated mantle minerals triggers the production of flush melting and consequently the arc volcanism. The heterogeneous water release controls also the depth of earthquake generation and therefore the size of the seismogenic zone.
Overall, understanding mantle serpentinization is critical to understand the dynamics of plate tectonics. To this end, this session aims at bringing together researchers of divergent and convergent settings to enhance our understanding of the kinematics of mantle serpentinization and its geodynamic implications. We encourage all related contributions, from geophysical and/or petrological studies to numerical/analogue modelling that provide temporal and spatial constraints of the process of serpentinization, as well as insights into its role during the evolution of rifted margins, oceanic ridges, and subduction zones. We strongly encourage the contribution of young researchers.

Co-organized as GD5.15/GMPV7.24
Convener: Manel Prada | Co-conveners: Miguel Andres-Martinez, Gaye Bayrakci, Louise Watremez, Esther Schwarzenbach
| Tue, 09 Apr, 08:30–10:15
Room D3
| Attendance Tue, 09 Apr, 14:00–15:45
Hall X2

Tuesday, 9 April 2019 | Room D3

08:30–08:45 |
| solicited
| Highlight
Mathilde Cannat, Stéphane Rouméjon, Ekéabino Momoh, and Sylvie Leroy
08:45–09:00 |
| Highlight
Andrew Merdith, Pablo Garcia Del Real, Isabelle Daniel, Muriel Andreani, Nicky Wright, and Nicolas Coltice
09:00–09:15 |
| solicited
| Highlight
Cesar R. Ranero, Ingo Grevemeyer, Valenti Sallares, and Jason Morgan
09:15–10:15 |
Serge Lallemand and Diane Arcay