First Advisor

Alexander Ruzicka

Term of Graduation

Spring 2022

Date of Publication

6-10-2022

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Geology

Language

English

Subjects

Meteorites, Olivine, Rock deformation, Metamorphism (Geology)

DOI

10.15760/etd.7874

Physical Description

1 online resource (v, 63 pages)

Abstract

Past studies of olivine have yielded insights into crystallographic slip systems and how they are activated thermally. Using this information in conjunction with Electron Backscatter Diffraction (EBSD) analysis and metrics developed for chondrites, I constrained the thermal environment and the cooling rate for four ureilite meteorites in an attempt to test the model of catastrophic disruption of the ureilite parent body while it was partly molten. Present evidence for deformation, along with thermal metrics, were examined in order to conclude the following: Deformation of the meteorites took place at high temperatures followed by swift cooling, leaving little time for annealing. Most samples yielded deformation estimates of 800 °C-1000 °C, lower than the anticipated range of 1200 °C-1300 °C. Annealing results were low, indicative of quick cooling rates, as expected based on prior studies. Overall the data support the catastrophic hot disruption model.

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Persistent Identifier

https://archives.pdx.edu/ds/psu/37917

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