Ervin, C. Patrick
M.S. (Master of Science)
Department of Geology
Morey and Sims proposed that a major Precambrian boundary exists in Minnesota separating a greenstone- granite terrane to the north and an older, gneissic terrane to the south. Sims later re-evaluated the same data and suggested that the boundary lies further north than the previously proposed boundary. A gravity survey was conducted in west-central Minnesota along a north-south profile crossing both boundaries. The two-dimensional, Talwani gravity modeling algorithm was used to deduce a geologic model of the area to better define the boundary between the two terranes. The geologic model supports Sims' boundary but suggests that a possible "transition zone", delineated by the two proposed boundaries, exists between the two terranes.
Van De Voorde, Barbara Wiley, "A geophysical study of a Precambrian crustal boundary in Minnesota" (1980). Graduate Research Theses & Dissertations. 344.
vii, 43 pages
Northern Illinois University
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