Electronic Thesis and Dissertation Repository

Degree

Master of Science

Program

Geophysics

Supervisor

Sheih, Sean R.

2nd Supervisor

Linnen, Robert L.

Abstract

While visually similar to graphite, graphitic carbon is disordered rings of carbon whereas graphite is the pure-carbon crystalline form. As graphitic carbon is heated, it undergoes an irreversible graphitization process which can be observed using Raman spectroscopy and determine the maximum temperature that a rock was exposed to. Samples of sedimentary rocks, taken from the Au-Ag San Sebastian mine in Durango Mexico, containing graphitic carbon located from positions in contact with mineralized veins were used in developing a low-cost protocol for Raman spectroscopic analysis of drill core. The samples were cut and then polished to provide a smooth surface, so that the Raman collection could be conducted on the drill core directly. When plotted on longitudinal sections, the temperature distribution identified potential up-flow zones where mineralizing fluids were focused. In conclusion Raman spectrometry of graphic carbon is a rapid, cost-effective geothermometer and shows considerable promise as an exploration tool.

All Collected Raman Spectra.zip (25128 kB)
Raw data for the Middle, Francine and North veins.

Available for download on Monday, July 01, 2019

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