Category: Activities

PhD Thesis Defence for Jeffrey Gay

Activities, People news, PhD Theses, Special Events, Student events, TIMEleSS news

PhD Thesis Defense, Jeffrey Gay, Nov 2022A new PhD defense for the TIMEleSS project!

On Nov 24th, 2022, Jeffrey Gay defended his thesis entitled Microstructures and anisotropy of pyrolite in the Earth’s lower mantle: insights from high pressure/temperature deformation and phase transformation experiments at the Université de Lille.

The PhD committee was composed of

  • Motohiko Murakami, ETH Zürich, Rapporteur
  • Denis Andrault, Univ. Clermont Auvergne, Rapporteur
  • Ana Ferreira, Univ. College London, Examinateur
  • Angelika Rosa, European Synchrotron Radiation Facility, Examinateur
  • Huges Leroux, Univ. Lille, Examinateur and President
  • Sébastien Merkel, Univ. Lille, PhD Advisor

Jeff presented his work for 45 minutes, followed by an hour of discussion with the committee. After deliberation, the committee decided to award the Doctoral Degree to Jeffrey Gay.

Congratulations Jeff!

PhD Thesis Defence for Estelle Ledoux

Activities, People news, PhD Theses, Special Events, Student events, TIMEleSS news

PhD Defence Estelle Ledoux, Oct 20, 2021A new PhD defense for the TIMEleSS project!

On Oct 20th, 2021, Estelle Ledoux defended her thesis entitled Microstructures de transformation et déformation dans le manteau terrestre : application au périclase et à la wadsleyite at the Université de Lille.

The PhD committee was composed of

  • Jannick Ingrin, Univ. Lille, President
  • Sylvie Demouchy, Univ. Montpellier II, Rapporteur
  • Daniele Antonangeli, Sorbonne Univ., Rapporteur
  • Jonathan Amodeo, Univ. Lyon 1, Examinateur
  • Isabelle Daniel, Univ. Claude Bernard Lyon 1, Examinateur
  • Sébastien Merkel, Univ. Lille, PhD Advisor
  • Damien Jacob, Univ. Lille, PhD Advisor

Estelle presented her work for 45 minutes, followed by an hour of discussion with the committee. After deliberation, the committee decided to award the Doctoral Degree to Estelle Ledoux.

Congratulations Estelle!

Publication in the European Journal of Mineralogy!

Activities, Publications

Publication 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 mechanismA 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 Annual Meeting

Activities, Conferences and workshops, Special Events, TIMEleSS news

TIMEleSS Annual Meeting 2020The 2020 TIMEleSS Annual Meeting was held online on 8-9 September 2020. Members from the Université de Lille (Julien Chantel, Jeffrey Gay, Estelle Ledoux, Sébastien Merkel), the Westfälische Wilhelms-Universität, Münster (Matthias Krug, Federica Rochira, Morvarid Saki, Angelo Pisconti, Christine Thomas), and the Deutsche GeoForschungsZentrum, Potsdam (Sergio Speziale) met for two half-days to discuss current advances and future plans.

The first day was dedicated to progress report by the PhD students. The second day followed by a scientific presentation by our guest Morvarid Saki and discussions on the geophysical implications of the results.

Despite the 2020 conditions, the TIMEleSS project is nicely moving forward. Students are reaching a stage when they fully interact with each other. The PIs can’t wait for next year with results and publications!

 

Lecture for junior high school students

Activities, Outreach, TIMEleSS news

Lecture for junior high school student

Students from the “Collège Val de la Sensée” in Arleux (Junior High School) are working on a project related to the famous Jules Vernes book Journey to the Center of the Earth.

On Nov. 25, 2019, they came to the Université de Lille for an example of a university class, as Otto Lidenbrock can teach in the Jules Vernes book. S. Merkel gave them a lecture on the Center of the Earth, as scientists view it and study it today, and how Jules Vernes visionary writings were both close and distant from today’s view of the Earth interior.

2nd Deep Earth Mini Symposium in Münster

Activities, Conferences and workshops, Student events, TIMEleSS news

TIMEleSS members at the 2nd Deep Earth Mini Symposium in Münster (18 Nov. 2019)The second Deep Earth Mini Symposium was held at the Institute for Geophysics of the University of Münster on November 18th 2019.

The one day symposium has presentations from local and international speakers who all came to Münster for a day of science and discussions. The workshop was organized by TIMEleSS PI C. Thomas.

TIMEleSS PI S. Merkel gave a presentation entitled Phase transitions in the lowermost mantle : Effect
on microstructures and seismic reflections. TIMEleSS students F. Rochira and M. Krug presented posters on their most recent works.

Synchrotron beamtime for TIMEleSS

Activities, Experiments, TIMEleSS news
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!

Second multigrain diffraction training session for TIMEleSS members

Activities, Special Events, TIMEleSS news
Second training session on multigrain analysis, February 2019

The TIMEleSS team is holding its second training session on multigrain diffraction data processing. The session takes place on Feb 11-15 at the Université de Lille, in France. Participants (left to right on the image) include Julien Chantel, our guest Agnès Dewaele, Sébastien Merkel, Jeffrey Gay, Sergio Speziale, Estelle Ledoux, Matthias Krug, and Carmen Sanchez-Valle.

The session is an opportunity for all members to get trained in multigrain diffraction data processing but also to standardize our data workflow strategies.

More to come soon with the TIMEleSS-tools developed at this occasion!

Busy week-end for the TIMEleSS team

Activities, Experiments, TIMEleSS news

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).

TIMEleSS PI’s will be at EGU 2018!

Activities, TIMEleSS news

TIMEleSS PI’s are calling for abstractsat EGU 2018! Look for session sessions

Deadline for abstracts submission is tomorrow, Wednesday 10 January 2018, 13:00 CET. Hope to see you in Vienna !

TIMEleSS Sessions at EGU 2018