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Dissertation/Thesis Abstract

Titanium in Quartz During Growth and Deformation Under Hydrothermal-Magmatic Conditions
by Acosta, Marisa Dawn, Ph.D., University of Oregon, 2020, 138; 28148228
Abstract (Summary)

Titanium in quartz is a promising tool with which to investigate processes of quartz growth and deformation. In this dissertation, I present and interpret the results of experimentally synthesized Ti-doped quartz crystals and shed light on sources of complexity that arise during non-equilibrium growth at 800℃ and 1 kbar. I use images of the Ti distributions in quartz from the Butte, Montana, porphyry Cu-Mo deposit to detail the sequence of events by which barren quartz and quartz-molybdenite veins are formed. I compare temperature estimates made with Ti concentrations to other independent methods of temperature estimates to show that the dark growth bands of CL-euhedral hydrothermal quartz record near-equilibrium growth and that the bright growth bands of CL-euhedral quartz are markers of disequilibrium “kinetic effects”. Lastly, I present a possible mechanism for the formation of oscillatory CL-bright and -dark growth bands under constant pressure and temperature conditions at low supersaturation.

This dissertation includes previously published and unpublished co-authored material.

Indexing (document details)
Advisor: Reed, Mark H., Watkins, James M.
Commitee: Guenza, Marina G., Dilles, John H., Giachetti, Thomas
School: University of Oregon
Department: Department of Geological Sciences
School Location: United States -- Oregon
Source: DAI-B 82/4(E), Dissertation Abstracts International
Source Type: DISSERTATION
Subjects: Geology, Hydrologic sciences, Thermodynamics, Low Temperature Physics
Keywords: Butte porphyry Cu, Deformation, Quartz, Quartz growth, Recrystallization, TitaniQ
Publication Number: 28148228
ISBN: 9798684690747
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