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On the formation of diaplectic glass: Shock and thermal experiments with plagioclase of different chemical compositions

Fritz, Jörg and Fernandes, Vera Assis and Greshake, Ansgar and Holtzwarth, Andreas and Böttger, Ute (2019) On the formation of diaplectic glass: Shock and thermal experiments with plagioclase of different chemical compositions. Meteoritics and Planetary Science, 54, pp. 1533-1547. Wiley. DOI: 10.1111/maps.13289 ISSN 1086-9379

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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 An50‐57 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 An50‐57 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 (An50‐57) 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.

Item URL in elib:https://elib.dlr.de/128236/
Document Type:Article
Title:On the formation of diaplectic glass: Shock and thermal experiments with plagioclase of different chemical compositions
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fritz, JörgSaalbau Weltraum Projekt, Heppenheim, GermanyUNSPECIFIED
Fernandes, Vera AssisSchool of Earth and Environmental Science, University of Manchester, Oxford Road, Manchester, M13 9PL UKUNSPECIFIED
Greshake, AnsgarMuseum für Naturkunde, Humboldt-Universität zu Berlin, D 10099 Berlin, GermanyUNSPECIFIED
Holtzwarth, AndreasErnst Mach Institut für Kurzzeitdynamik, Fraunhofer Institut, Am Klingenberg 1, 79588 Efringen‐Kirchen, GermanyUNSPECIFIED
Böttger, UteInstitut für Optische SensorsystemeUNSPECIFIED
Date:15 April 2019
Journal or Publication Title:Meteoritics and Planetary Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1111/maps.13289
Page Range:pp. 1533-1547
Keywords:Plagioclase, diaplectic glass, shock experiments
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben OptoRob
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Space Instruments
Deposited By: Böttger, Dr.rer.nat. Ute
Deposited On:03 Jul 2019 09:52
Last Modified:06 Sep 2019 15:28

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