Date of Award

8-1991

Degree Name

Master of Science

Department

Geosciences

First Advisor

Dr. R. B. Chase

Second Advisor

Dr. C. J. Schmidt

Third Advisor

Dr. R. N. Passero

Access Setting

Masters Thesis-Open Access

Abstract

The major fracture systems in the Jacobsville sandstone likely originated by reverse faulting on the Keweenaw fault and by glacially produced thrusting. Fracture orientations, apertures, and spacings are uniform in the Jacobsville sandstone and Lighthouse Point member of the Mona Schist, and are variable in the Lower member of the Mona schist and Compeau Creek gneiss. Fracture sets in the Compeau Creek gneiss exist in domains separated by metadiabase dikes. The metadiabase dikes relieved the strain produced by the Penokean orogeny by fracturing. Fractures present in inclusions, quartz veins, metadiabase and diabase dikes can be used to temporally evaluate the strain history of the Compeau Creek gneiss.

Potential sources for useful groundwater wells will be found in areas of thrust faulted Jacobsville sandstone, fractured zones in the pillowed Lower member of the Mona schist, and linear sags in the topography of the Compeau Creek gneiss.

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