Mechano-chemical feedbacks during deformation and hydration of peridotites
Appears in the following Collection
- Institutt for geofag 
AbstractThe hydration of the Earth’s mantle is a crucial process for many aspects of our planet, from the behaviour of the tectonic plates to the global water cycle and the origin of life. This process is called serpentinization and has a considerable impact on the rock’s behaviour when under stress. It makes rocks easier to break and is associated with a volume increase that can locally perturb tectonic stress and break surrounding rocks. The rock composing the mantle, peridotite, has however a very low permeability, and water has difficulties to circulate within it. Faulting is thus intimately linked to the water supply during serpentinization. Even though the link between faulting and serpentinization has been established, the way these two processes interact is not fully understood. Tectonically and seismically active zones in oceanic context are recognized to be preferred zones of serpentinization, but most common models for serpentinization do not reflect this major role of tectonics. This work highlights the role of tectonics in serpentinization initiation and maintenance through a combination of microstructural and seismic studies.
List of papers
|Paper 1 Aupart,C., Dunkel,K.G., Angheluta,L., Austrheim,H., Ildefonse,B., Malthe-Sørenssen,A., & Jamtveit,B.(2018). Olivine grain size distributions in faults and shear zones: Evidence for nonsteady state deformation. Journal of Geophysical Research: Solid Earth, 123. 10.1029/2018JB015836 The paper is included in the thesis, and is also available at: https://doi.org/10.1029/2018JB015836|
|Paper 2 Aupart,C., Schlindwein,V., Ben-Zion,Y., Renard,F., & Jamtveit,B. Seismic controls on the progress of serpentinization at ultra-slow spreading ridges. To be published. The paper is removed from the thesis in DUO awaiting publishing.|
|Paper 3 Aupart,C., Morales,L., Godard,M., Jamtveit,B., & the Oman DP science team. Microstructures and mass-transfer associated with early faults in peridotites from the Samail Ophiolite, Oman To be published. The paper is removed from the thesis in DUO awaiting publishing.|