T57 Visions of Minerals at the Nanoscale II: In Honor of Mineralogical Society of America Roebling Medalist Peter R. Buseck

Sunday, 22 September 2019
1:30 PM - 5:30 PM
Room 132ABC, North Building

THE THERMOCHEMISTRY OF THE EARLY SOLAR PROTOPLANETARY DISK AS REVEALED THROUGH ATOMIC-SCALE ANALYSIS OF THE FIRST SOLAR-SYSTEM SOLIDS

Paper number: T57-3
Program: Technical Sessions
Time: 2:05 PM – 2:20 PM

Authors

  • Thomas Zega Presenting Author
    University of Arizona, Tucson, AZ

Abstract

Here I report on atomic-scale investigation of calcium- and aluminum-rich inclusions (CAIs). So named because of the Ca- and Al-rich materials they contain, CAIs are composed of mineral phases formed at very high temperatures and which are predicted by thermodynamic models to be among the first solids to have condensed within a cooling gas of solar composition. Perovskite, nominally CaTiO3, is the major Ti-bearing phase in type-A CAIs and is predicted to host rare-earth elements and (minor) lithophile elements. Using aberration-corrected scanning transmission electron microscopy (STEM), we find nano- to atomic-scale structure that is at odds with longstanding thermochemical models of solar-system formation. I will discuss the implications of such structure at the meeting.

Geological Society of America Abstracts with Programs. Vol. 51, No. 5

doi: 10.1130/abs/2019AM-335418

© Copyright 2019 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.