Structure analysis and conditions of formation of akimotoite in the Tenham chondrite

Tschauner, O.; Ma, C.; Prescher, C.; Prakapenka, V. B.

doi:10.1111/maps.13009

Title: Structure analysis and conditions of formation of akimotoite in the Tenham chondrite

Journal Article · Tue Dec 12 00:00:00 EST 2017 · Meteoritics and Planetary Science

DOI:https://doi.org/10.1111/maps.13009· OSTI ID:1413059

^[1];

^[2]; Prescher, C. ^[3]; Prakapenka, V. B. ^[4]

Department of Geoscience, University of Nevada, Las Vegas Nevada 89154-4010 USA
Division of Geology and Planetary Sciences, California Institute of Technology, Pasadena California 91125 USA
Center for Advanced Radiation Sources, University of Chicago, Chicago Illinois 60637 USA; Institut für Geologie und Mineralogie, Universität zu Köln, 4705619 Köln Germany
Center for Advanced Radiation Sources, University of Chicago, Chicago Illinois 60637 USA

Abstract Akimotoite (Mg,Fe)SiO ₃ is one of the most common mineralogical indicators for high‐level shock metamorphism in meteorites. First described 1997, its occurrence has been amply confirmed in a number of highly shocked chondrites. Yet, a thorough structure analysis of natural akimotoite has remained extant. Here we report accurate cell parameters, fractional atomic coordinates, and site occupancies for natural akimotoite from the holotype specimen based on synchrotron microdiffraction. The variation of unit cell shape and volume with Fe content define mixing volumes. Based on the mixing volume relation for akimotoite and hemleyite, we constrain the unit cell volume of endmember hemleyite to 273.8 ± 1.0 Å ³ . We show that mixing is nearly ideal for low Fe content but evolves to positive excess volume toward the Fe endmember. Based on this finding and the actual composition of akimotoite in Tenham, we show that this mineral has formed by solid–solid transformation prograde from enstatite, not by crystallization from melt.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)

Grant/Contract Number:: NA0001974; FG02-94ER14466; DE‐FG02‐94ER14466; FG02‐94ER14466; EAR‐1634415; EAR‐0318518; DMR‐0080065

OSTI ID:: 1413059

Alternate ID(s):: OSTI ID: 1413060; OSTI ID: 1423344

Journal Information:: Meteoritics and Planetary Science, Journal Name: Meteoritics and Planetary Science Vol. 53 Journal Issue: 1; ISSN 1086-9379

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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