Reconstruction of shock conditions and recovery paths in shock melt veins and pockets in martian and chondritic meteorites
Reconstruction of shock conditions and recovery paths in shock melt veins and pockets in martian and chondritic meteorites
Previously Published Material: Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite, O. Tschauner, C. Ma, J. Beckett, C. Prescher, V. Prakapenka, G.Rossman, Science 346, 110-1102, DOI: 10.1126/science.1259369 (2014)
Abstract ID#: 34605
English Abstract:
Recent advancements in micro-diffraction analysis in combination with SEM- and EPM-based chemical analysis provide us with a rapidly increasing set of high-pressure metamorphic minerals that occur in shocked meteorites. This includes bridgmanite (1), ahrensite (2), tissintite (3), liebermanite (4) and others. I will briefly introduce the methodology of synchrotron-diffraction/spectroscopy based identification and characterisation of shock-generated high pressure minerals. Then I will show how the high-pressure mineral paragenesis, their spatial distribution, and constraints from shock-physics provide us with surprisingly narrow constraints for peak shock conditions, and shock release paths (in P-T space). Finally, I will address the issue of shock duration in martian meteorites such as Tissint and in ordinaray chondrites.
1: Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite,