Project 7

Low-grade shock metamorphism of quartz in porous and wet sedimentary rocks

Project directors:

Wolf Uwe Reimold, Ralf Thomas Schmitt
Museum für Naturkunde Berlin (MfN) and Humboldt-Universität Berlin (HUB)

Research staff:

Astrid Kowitz (PhD student, MfN)

Within the context of the Multidisciplinary Experimental and Modeling Impact research Network (MEMIN) this project will focus on low-grade shock metamorphism in porous and wet sedimentary rocks. The goal of this project is (i) to study the influence of porosity and water saturation on the development of shock effects and of progressive shock metamorphism, and (ii) the pressure calibration of these shock effects in minerals, especially in the low shock pressure range ≤10-15 GPa. This necessitates the performance of shock recovery experiments.

We will focus on the mineral quartz, which is one of the most abundant minerals in the Earth´s upper crust and the most important mineral for shock barometry. Based on the results from this project a shock calibration and classification system will be developed which, for the first time, will take porosity and water saturation of the target material into account. This calibration and classification system will be tested using the cratering experiments of the MEMIN project. In the second application period the shock calibration and classification system will be applied to natural materials from selected confirmed impact craters and questionable impact structures.

Results

You can find the results here.