Date of Award

Spring 5-16-2014

Degree Type

Thesis

Degree Name

M.S.

Degree Program

Earth and Environmental Sciences

Department

Earth and Environmental Sciences

Major Professor

Dr. William Simmons

Second Advisor

Mr. Alexander Falster

Third Advisor

Dr. Karen Webber

Abstract

This study focuses on exocontact mineral assemblages to determine composition, thermal signatures, and the extent of exomorphism that occurred between the Mt. Mica pegmatite and the migmatite host rock at the contact. Biotite-garnet thermometry of country rock samples resulted in an average temperature estimate of 630 °C. Measured biotite Fe/(Fe+Mg) ratios were used to calculate an fO2 of -18. The results indicate that the country rock and pegmatite formed under similar oxidizing conditions near the quartz-fayalite-magnetite (QFM) equilibria buffer. Whole rock (REE) analysis indicates an interaction trend between the country rock and pegmatite. Exomorphism does not appear to have been significant at Mt. Mica, likely due to the moderately evolved nature of the pegmatite. Minor B leakage into the surrounding country rock is constrained to within 15 cm from the contact. Results indicate no enrichment of alkali elements (Li, Rb, Cs), As, U, or F occurred in minerals analyzed.

Rights

The University of New Orleans and its agents retain the non-exclusive license to archive and make accessible this dissertation or thesis in whole or in part in all forms of media, now or hereafter known. The author retains all other ownership rights to the copyright of the thesis or dissertation.

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