Mathematics – Logic
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0181815x&link_type=abstract
Technical Report, Arizona State Univ. Tempe, AZ United States Dept. of Geological Sciences
Mathematics
Logic
Chondrites, Veins (Petrology), Minerals, Mineral Deposits, Crystallization, High Pressure, Impact Melts, Transmission Electron Microscopy
Scientific paper
Shock-induced melt veins in the Umbarger L6 (S6) chondrite contain a previously unknown set of high-pressure phases consisting of ringwoodite ((Mg, Fe)2SiO4), akimotoite ((Mg, Fe)SiO3-ilmenite), augite ((Ca, Na)(Mg, Fe, Al)(Si, Al)2O6), and hollandite-structured plagioclase ((Na, K, Ca)(Al, Si)4O8). Crystallization of akimotoite suggests supercooling of the melt vein during adiabatic decompression. High-pressure minerals are common in highly shocked (S6) L6 chondrites. These minerals, which occur within or adjacent to shock-induced melt veins, provide evidence of very high pressure and temperature conditions during impact events. The goal of this study is to characterize the high-pressure mineral assemblages of the melt veins in the L6 chondrite Umbarger to better understand crystallization conditions, and the shock history of meteorite parent body. Mineral assemblages in shock-induced melt veins have been used to estimate crystallization conditions during shock metamorphism. based on phase equilibrium data. Umbarger was previously classified as shock stage S4, based on deformation features not associated with melt veins. Based on previously unrecognized ringwoodite in the melt veins of Umbarger, we classified the shock stage as S6. Further transmission electron microscopy (TEM) study reveals several other high-pressure phases in melt veins that can be used to infer crystallization and shock conditions.
Sharp Thomas G.
Tomioka Naotaka
Xie Zhaohua
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