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Disputation: Claire Olga Maryse Aupart

Doctoral candidate Claire Olga Maryse Aupart  at the Department of Geosciences, Faculty of Mathematics and Natural Sciences, is defending the thesis Mechano-chemical feedbacks during serpentinization of ultramafic rocks for the degree of Philosophiae Doctor.

Claire Olga Maryse Aupart. Photo: Private

Claire Olga Maryse Aupart. Photo: Private

The PhD defence and trial lecture are fully digital and streamed using Zoom. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.

Ex auditorio questions: the chair of the defence will invite the audience to ask ex auditorio questions either written or oral. This can be requested by clicking 'Participants -> Raise hand'. 

 

Trial lecture

A comparison of the concepts of oceanic crust and oceanic lithosphere

 

Conferral summary (in Norwegian)

Hydratiseringen av jordens mantel er en avgjørende prosess for mange aspekter av planeten vår, fra bevegelsene til tektoniske plater, til den globale vannsyklusen og livets opprinnelse. Dette ph.d. arbeidet fremhever den viktigste rollen til tektonikk i initiering og vedlikehold av denne hydratiseringsprosessen, gjennom en kombinasjon av mikrostrukturelle- og seismiske studier.

Main research findings

Popular scientific article about Aupart’s dissertation:

Mechano-chemical feedbacks during serpentinization of ultramafic rocks

The hydration of the Earth’s mantle is a crucial process for many aspects of our planet, from the motion 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.

Image may contain: Green, Line, Text, Diagram, Plot.
This figure show the schematic feedbacks between serpentinization and fracturing. Serpentinization and fracturing interact with each other, each process having consequences for the other. See the figure in a larger version. Figure/Illustration: Claire Aupart

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 PhD work and dissertation highlights the role of tectonics in serpentinization initiation and maintenance through a combination of microstructural and seismic studies.

Photo and other information:

Press photo: Claire Aupart, portrait; 240px. Photo: Private

Other photo material: Figure with description and credit as specified in the article above, size 1000px.

Published Oct. 30, 2020 9:27 AM - Last modified Nov. 27, 2020 5:11 PM