Open AccessDiscovery of coesite and stishovite in eucrite
Author(s) -
Masaaki Miyahara,
Eiji Ohtani,
Akira Yamaguchi,
Shin Ozawa,
Takeshi Sakai,
Naohisa Hirao
Publication year - 2014
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.1404247111
Subject(s) - stishovite , coesite , meteorite , shock metamorphism , geology , cristobalite , quartz , parent body , geochemistry , mineralogy , chondrite , astrobiology , paleontology , eclogite , subduction , physics , tectonics
Significance Quartz and/or cristobalite in eucrite were transformed into denser minerals, coesite and stishovite, under transient high-pressure and high-temperature conditions. Coesite and stishovite probably formed simultaneously under pressures of similar magnitudes but under different temperature conditions. The expected age of the dynamic event that formed coesite and stishovite isca. 4.1 Ga ago, which is inconsistent with the predicted formation age (ca. 1.0 Ga) of the impact basins on 4 Vesta.
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