Date of Award


Degree Name

Master of Science


Geological and Environmental Sciences

First Advisor

Dr. John D. Grace

Second Advisor

Dr. Ronald B. Chase

Third Advisor

Dr. W. Thomas Straw

Access Setting

Masters Thesis-Open Access


The origin of the Sudbury Breccia surrounding the Sudbury Basin of Ontario, Canada has long been debated. The breccia has been described both as an igneous injection and as an abraded country rock formed by attrition in place.

A geochemical analysis of selected elements in matrix and clast samples from the breccia revealed distinct differences between the two sample groups. Matrix samples were lower in silicon and higher in heavy elements than the clasts. Matrix and clasts were comparable in light elements.

The results of the analysis favor an igneous process. Petrographic observations and structural evidence support this idea. The Sudbury Breccia is most likely related to the sublayer beneath the basin.

Included in

Geochemistry Commons