The TIMEleSS project aims at studying interfaces in the Earth’s mantle combining observations from seismology, mineral physics experiments, microstructures, and wave propagation modeling. It is supported through a bilateral grant, from the ANR in France and the DFG in Germany. The project is led by Sébastien Merkel and Nadège Hilairet at the Université de Lille, Christine Thomas and Carmen Sanchez-Valle from the Westfälische Wilhelms-Universität, Münster, and Sergio Speziale from the Deutsche GeoForschungsZentrum, Potsdam.
Project launch: March 2018
Duration: 36 months, extended until December 2022
Total ANR-DFG funding: 700 000 €
TIMEleSS members C. Thomas, S. Merkel, J. Gay, E. Ledoux, J.K. Magali are at the Collège de France for a workshop on Global Scale Seismic Imaging and Dynamics of the Earth’s Mantle organized by Barbara Romanowicz, chair for Deep Earth Physics at the Collège de France.
TIMEleSS PI S. Merkel and C. Thomas are presenting keynote lectures on Phase transitions in the mantle: effect on microstructures and seismic observables and Investigating deformation in the mantle through seismological observations. Students J. Gay and E. Ledoux also presented posters with their latest results on the transition zone and lower mantle.
First in-person meeting in many months!
After undergraduate studies in the Philippines he joined the International Center for Theoretical Physics in Trieste for a post-graduate diploma, followed by a PhD at the Université de Lyon. He is interested in inversion techniques of seismic data and how seismic data can be used as a constrain for geodynamics.
In TIMEleSS, John Keith will be in charge of studying the effect of mineral microstructures on elastic wave propagation and upscaling mineral physics knowledge to the scale of seismic observations.
A new publication from a TIMEleSS student in the European Journal of Mineralogy : Deformation of NaCoF3 perovskite and post-perovskite up to 30 GPa and 1013 K: implications for plastic deformation and transformation mechanism.
Jeff Gay uses a resistively heated diamond anvil to study the plastic deformation and phase transformation mechanisms in NaCoF3. Under ambient pressure, NaCoF3. crystallizes in the perovskite structure, and later transforms to the post-perovskite. It is hence an excellent analogue to understand the physical properties of bridgmanite, the most abundant mineral on Earth, and dominant component of the Earth’s lower mantle between 660 and 2900 km depth.
These results from a collaboration between the Université de Lille, the University of Utah, University College London, and the PETRA III / DESY synchrotron source were published on 30 Sep 2021 in the European Journal of Mineralogy.
Full reference: J. P. Gay, L. Miyagi, S. Couper, C. Langrand, D. P. Dobson, H.-P. Liermann, S. Merkel, Deformation of NaCoF3 perovskite and post-perovskite up to 30 GPa and 1013 K: implications for plastic deformation and transformation mechanism, European Journal of Mineralogy, 33, 591–603 (2021), abstract [doi: 10.5194/ejm-33-591-2021].
TIMEleSS members met virtually in September 2021 to discuss on the transition zone. The meeting was led by Estelle Ledoux, PhD student at the Université de Lille.
The meeting was an occasion for Estelle to present her work, get feedback from the rest of the group, prepare for future collaborations, and get ready for her up-coming PhD defense!