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Martian meteorite Tissint records unique petrogenesis among the depleted shergottites
Author(s) -
Basu Sarbadhikari A.,
Babu E. V. S. S. K.,
Vijaya Kumar T.,
Chennaoui Aoudjehane H.
Publication year - 2016
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/maps.12684
Subject(s) - olivine , geology , plagioclase , pyroxene , petrogenesis , meteorite , geochemistry , augite , basalt , fractional crystallization (geology) , mineralogy , quartz , astrobiology , physics , paleontology
Tissint, a new unaltered piece of Martian volcanic materials, is the most silica‐poor and Mg‐Fe‐rich igneous rock among the “depleted” olivine‐phyric shergottites. Fe‐Mg zoning of olivine suggests equilibrium growth (<0.1 °C h −1 ) in the range of Fo 80–56 and olivine overgrowth (Fo 55–18 ) through a process of rapid disequilibrium (~1.0–5.0 °C h −1 ). The spatially extended (up to 600 μm) flat‐top Fe‐Mg profiles of olivine indicates that the early‐stage cooling rate of Tissint was slower than the other shergottites. The chemically metastable outer rim of olivine (