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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Abstract
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/ | ||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||
Title: | On the formation of diaplectic glass: Shock and thermal experiments with plagioclase of different chemical compositions | ||||||||||||||||||
Authors: |
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Date: | 15 April 2019 | ||||||||||||||||||
Journal or Publication Title: | Meteoritics and Planetary Science | ||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||
Volume: | 54 | ||||||||||||||||||
DOI : | 10.1111/maps.13289 | ||||||||||||||||||
Page Range: | pp. 1533-1547 | ||||||||||||||||||
Publisher: | Wiley | ||||||||||||||||||
ISSN: | 1086-9379 | ||||||||||||||||||
Status: | Published | ||||||||||||||||||
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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