Paper out in Nature Communications !

Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D″ layerFirst  publication for the TIMEleSS team: Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth’s D″ layer.

Bridgmanite is a magnesian-iron mineral ((Mg,Fe)SiO3) with a crystal structure that is not stable under ambient conditions. It forms about 660 kilometers below the surface of the Earth, and transforms to a new structure at even greater depth, approximately 2700 km depth, just above the Core-Mantle boundary.

During his PhD, C. Langrand, PhD student at the Université de Lille studied the kinetics of such transformation. It is fast on geological timescales: about 10 to 10,000 seconds, depending on pressure and temperature. Thanks to the collaborations in the TIMEleSS project, the authors realized that this includes the timescales of seismic waves. As such, seismic waves can trigger the transformation and, in turn, the transformation can amplify the seismic signal from D” seismic reflections.

These results from a collaboration between the Université de Lille, the université Clermont-Auvergne, the université de Lyon, the Westfälische Wilhelms-Universität, MünsterCNRS, and the PETRA III / DESY synchrotron source were published on 12 decembre 2019 in Nature Communications.

Full reference : C. Langrand, D. Andrault, S. Durand, Z. Konôpková, N. Hilairet, C. Thomas, S. Merkel, Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth’s D″ layer, Nature Communications, 10, 5680 (2019) [doi: 10.1038/s41467-019-13482-x].

Synchrotron beamtime for TIMEleSS

Samples for experiments at PETRA III

The TIMEleSS group is at the PETRA III synchrotron this week-end. Matthias Krug, Estelle Ledoux, Jeff Gay, Julien Chantel, Carmen Sanchez-Valle, Sébastien Merkel, and special guest Anastasiia Zadoia will be spending some time at P02.2…

Two months of sample synthesis, polishing, coating, cutting, and 10 diamond anvil cells loaded.

Nights will be shorts for the next four days. Let’s cross fingers, we need data for our next multigrain diffraction datathon!

Busy week-end for the TIMEleSS team

TIMEleSS at PETRA, June 2018

Members of the TIMEleSS project are spending a few days at the P02.2 beamline of the PETRA III synchrotron in Hamburg. Week-end will be busy and samples will get hot!

On the picture: Melissa Achorner (WWU Münster), Sergio Speziale (GFZ Potsdam), Estelle Ledoux (Univ. Lille), Matthias Krug (WWU Münster), Ilya Kupenko (WWU Münster), Julien Chantel (Univ. Lille), and Carmen Sanchez-Valle (WWU Münster).