New Paper in American Mineralogist

Johannes accepted paper on „the equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry“ is now available as pre-print from American Mineralogist (Link).

New PhD student

We welcome Niccolò Satta as new PhD student. Niccolò will be working on the high-pressure/high-temperature single-crystal elastic properties of hydrous minerals. His PhD work is supported by the International Research Training Group „Deep Earth Volatile Cycles“ funded by the German Science Foundation.

Public Outreach, „Tag der offenen Tür“ at the Bavarian Academy of Sciences

GeoMaX group members presented the activities of BGI Bayreuth at the „Tag der offenen Tür“ of the Bavarian Academy of Sciences in Munich. The presentations included „volcono building“ for kids. Some impressions are summarized below.

Johannes talks about high-pressure/high-temperature research at BGI Bayreuth.

Alexander explains the principles of a diamond-anvil cell

Fabian sets up the indoor volcano after the kids build their little own.

The three images above five some impression of the „candy-volcano“ presentation.

2 invited talks at EGU conference

The GeoMaX group was invited to give two talks at the EGU meeting in Vienna.

Alex talked about his elasticity data on bridgmanite in the session „Dynamics of the mantle and core in the Earth and planetary bodies: from magma oceans to the present day“ (GD3.1/EMRP4.41/GMPV6.6/PS9.3/SM10.12).

Hauke presented recent results of the group’s work in the session „Understanding Earth’s mantle with links to geological cycles“ (GD3.2/EMRP4.24/SM10.1).

Publication in High-Pressure Research online

Kirsten’s work on the possibilities to use tailored single-crystal samples in the pressure chamber of a diamond-anvil cell has been published online. The paper entitled „Multi-sample loading technique for comparative physical property measurements in the diamond-anvil cell“ can be found here.

 

4-smaple

Paper in Scientific Reports

GeoMaX group members co-author a recently published paper on the synthesis and properties of „transparent polycrystalline cubic silicon nitride“. The article is published online in Nature Scientific Reports and can be found here.

New Publication in Nature

The work of GeoMaX postdoc Alexander on the high-pressure elasticity of single-crystal bridgmanite has been published online in Nature today (link). Bridgmanite is the most abundant mineral in our planet and knowledge of its elastic behavior is needed to interpret seismological observations and link them to the structure, composition and dynamics of Earth’s interior. Our paper reports on the first experimental determination of the elastic tensor and sound wave velocities of (Al,Fe)-bearing bridgmanite at pressures of Earth’s lower mantle. In the work published today, we compare models based on our experimental results to seismic observations and thereby constrain the average composition of the shallow lower mantle. We find that a mantle of pyrolitic composition is consistent with seismic observations if bridgmanite contains ferric iron (Fe3+). We further find that depth-dependent changes of the ferric iron content may occur in bridgmanite. This novel finding opens the possibility for related variations in physical and chemical properties of the lower mantle with depth that need to be determined in future studies.

Seminar Talk at University of Oxford

Hauke was invited by the University of Oxford to present the recent GeoMaX achievements. The presentation which was aimed at a wide ranging audience of geoscienctists was part of a special seminar held on February, 6th in the Earth Science building in Oxford.