^1,2Jörg Fritz,^3,4Vera Assis Fernandes,³Ansgar Greshake,⁵Andreas Holzwarth,⁶Ute Böttger
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13289]
¹Saalbau Weltraum Projekt, Liebigstraße 6, 64646 Heppenheim, Germany
²Zentrum für Rieskrater und Impaktforschung Nördlingen (ZERIN), Vordere Gerbergasse 3, 86720 Nördlingen, Germany
³Museum für Naturkunde, Leibniz Institut für Biodiversität und Evolutionsforschung, Invalidenstraße 43, 10115 Berlin, Germany
⁴School of Earth and Environmental Science, University of Manchester, Oxford Road, Manchester, M13 9PL UK
⁵Ernst Mach Institut für Kurzzeitdynamik, Fraunhofer Institut, Am Klingenberg 1, 79588 Efringen‐Kirchen, Germany
⁶Institut für Optische Sensoren Systeme, Deutsches Zentrum für Luft und Raumfahrt (DLR), Rutherfordstr. 2, 12489 Berlin, Germany
Published by arrangement with John Wiley & Sons

This contribution addresses the role of chemical composition, pressure, temperature, and time during the shock transformation of plagioclase into diaplectic glass—i.e., maskelynite. Plagioclase of An_50‐57 and An₉₄ was recovered as almost fully isotropic maskelynite from room temperature shock experiments at 28 and 24 GPa. The refractive index (RI) decreased to values of a quenched mineral glass for An_50‐57 plagioclase shocked to 45 GPa and shows a maximum in An₉₄ plagioclase shocked to 41.5 GPa. The An₉₄ plagioclase experiments can serve as shock thermobarometer for lunar highland rocks and howardite, eucrite, and diogenite meteorites. Shock experiments at 28, 32, 36, and 45 GPa and initial temperatures of 77 and 293 K on plagioclase (An_50‐57) produced materials with identical optical and Raman spectroscopic properties. In the low temperature (<540 K) region, the formation of maskelynite is entirely controlled by shock pressure. The RI of maskelynite decreased in heating experiments of 5 min at temperatures of >770 K, thus, providing a conservative upper limit for the postshock temperature history of the rock. Although shock recovery experiments and static pressure experiments differ by nine orders of magnitude in typical time scale (microseconds versus hours), the amorphization of plagioclase occurs at similar pressure and temperature conditions with both methods. The experimental shock calibration of plagioclase can, together with other minerals, be used as shock thermobarometer for naturally shocked rocks.

^1,4Zalewska, N.E.,²Mroczkowska-Szerszeń, M.,³Fritz, J.,⁴, Błęcka, M.
Aircraft Engineering and Aerospace Technology 91, 333-345 Link to Article [DOI: 10.1108/AEAT-01-2018-0051]
¹Institute of Aviation, Warsaw, Poland
²Department of Geology and Geochemistry, Oil and Gas Institute, National Research Institute, Krakow, Poland
³Saalbau Weltraum Projekt, Heppenheim, Germany
⁴Department of Planetology, Space Research Center PAS, Warsaw, Poland

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^1,2Coldwell, B.C.,^1,2,3,4,5Pankhurst, M.J.
Journal of the Geological Society 176, 209-224 Link to Article [DOI: 10.1144/jgs2018-084]
¹Instituto Tecnológico y de Energías Renovables (ITER), Granadilla de Abona, Santa Cruz de Tenerife 38600, Spain
²Instituto Volcanológico de Canarias (INVOLCAN), Calle Álvaro Martín Díaz 1, San Cristóbal de La Laguna, Santa Cruz de Tenerife 38320, Spain
³School of Materials, University of Manchester, Manchester, M13 9PJ, United Kingdom
⁴Research Complex at Harwell, Harwell Campus, Didcot, OX11 0FA, United Kingdom
⁵School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom

We currently do not have a copyright agreement with this publisher and cannot display the abstract here