Meeting Planning Services

8:30 AM

Reimold W. U.* Langenhorst F. Wuennemann K.

A Symposium on "Impact Cratering and Shock Metamorphism — In Memoriam Dieter Stöffler (1939–2023)" [#6015]
This introduction to the Special Session "A Tribute to Dieter Stoeffler," who passed away in April 2023, introduces the exceptional scientific contributions and standing in the scientific community of the honored, thus setting the scene for the event.

8:45 AM

Langbein J.* Pollok K. Fazio A. Langenhorst F.

Shock Experiments on Single-Crystal Quartz and the Influence of Shear and Crystal Orientation on Shock-Metamorphic Effects [#6287]
We report on shock experiments with discs of single-crystal quartz in three crystallographic orientations using a modified experimental setup. The experiments show the influence of crystal orientation and shear on shock-metamorphic effects.

9:00 AM

Gibson R. L.* Reimold W. U. Alwmark C. Alwmark S. Struzynska P. et al.

Shock Petrography of Impactites from the Oasis Impact Structure, Libya [#6272]
Quartz grains in sandstones and breccias from the Oasis show PFs and rare FFs and PDFs at R < 4 km. PDFs are found only in the breccias, suggesting an allochthonous or intrusive origin.

9:15 AM

Struzynska P.* Alwmark S. Alwmark C. Poelchau M. Lambert P.

A Shockingly Striking Map of Rochechouart [#6177]
In this study, we use orientations of planar deformation features (PDFs) in quartz to construct a shock barometric map of the Rochechouart impact structure.

9:30 AM

Langenhorst F.* Otzen C. Liermann H. P.

How do Planar Deformation Features Form in Quartz? [#6331]
To mimick pressure profiles in impacts, we rapidly compressed single-crystal quartz in diamond anvil cells. In-situ X-ray data show a new rosiaite-type high-pressure phase, which collapses during decompression to amorphous lamellae resembling PDFs.

9:45 AM

Alwmark S.* Alwmark C. Wallentin J. Hektor J. Chen H. et al.

Spatially Resolved Planar Deformation Features in Naturally and Experimentally Shocked Quartz with Synchrotron X-Ray Diffraction [#6316]
The Nanobeam synchrotron X-ray diffraction technique allows high-resolution study of the local structures in complex shocked materials, exemplified by our experiment revealing the detailed architecture of planar deformation features in quartz.

10:00 AM

Jaret S. J.* Sharp T. G. Shteynman L.

High-Pressure SiO2 Phase Assemblage from the Tenoumer Impact Structure, Mauritania [#6152]
High pressure phases / Are obscured if they revert / Can we still see them?

10:15 AM

Shteynman L.* Sharp T. G.

Zircon to Reidite and Back Again: Using Nano-Scale Fabrics to Constrain Transformation Mechanisms [#6230]
Sometimes zircon gets pushed past its limit and turns into reidite. And sometimes reidite can't handle the heat and turns back into zircon. What do different steps along the way look like compared to each other?

10:30 AM

Musolino A.* Devouard B. Rochette P. Roperch P. Zanetta P.-M. et al.

Evaluating the Use of Decomposed Zircons for the Identification of Impact and Airburst Glasses [#6036]
Decomposed zircons are geothermometers used for the identification of impact/airburst glass. We successfully reproduced the decomposition of zircons at conditions less extreme than the ones expected (T ≤ 1000°C), in the presence of reagents like gypsum and NaCl.

10:45 AM

Poelchau M. H.* Kenkmann T. Winkler R. Wirth R. Luther R. et al.

Shear Stresses in Experimentally Shock-Twinned Calcite [#6329]
Tectonic calcite twin piezometers were validated and extended with a cratering experiment. High calcite twin densities can be used as indicators for high differential stress found outside of conventional tectonic situations, i.e., shock metamorphism.

11:00 AM

Dobrica E.* Megevand V. Krot A. N. Brearley A. J.

The Role of Apatite in Understanding Shock Metamorphic Processes [#6049]
We focus on apatites from ordinary chondrites (OCs) to understand their susceptibility to shock metamorphism.

11:15 AM

Hallis L. J.* Burchell M. Wozniakiewicz P. J. McGill R. Bompard N. et al.

The Effect of Shock on Apatite Hydrogen [#6192]
As all meteorites are shocked to some degree it is important to understand whether impact processes modify the hydrogen content of apatite.

11:30 AM

Mans W. W.* Knudson M. Brearley A. Agee C. Cochrane K. et al.

Observations from High-Velocity Recovery Experiments of the Crystallization Behavior of Olivine from Iron-Enriched Melts [#6432]
Direct observations from high-velocity recovery experiments on how impact conditions effect the evolution of iron in forsterite-fayalite shock melt veins.

11:45 AM

Forman L. V.* Benedix G. K.

Decoding Martian Shock Histories Via EBSD: Insights from Early Amazonian Meteorite Northwest Africa 8159 [#6239]
NWA 8159 is a unique and intruiging sample from the Red Planet. Here, we continue investigations into the crystallographic properties and relationships between shock melt veins and host rock grains to further understand shock processing on Mars.