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Granitic Rocks from 3 Deep Drill-Holes, Illinois
Journal of Geology
  • Charles J Vitaliano, Indiana University - Bloomington
  • George R McCormick, University of Iowa
  • Peter Dahl, Kent State University - Kent Campus
  • Yoram Eckstein, Kent State University - Kent Campus
Publication Date
Document Type
A medium- and coarse-grained granite has been encountered in the lower 914 m of deep drill-holes in northwestern Illinois. The mineralogy and chemistry of both types of granite suggest they are anorogenic A-type granites after the definition of Loiselle and Wones (1979). The major oxide composition for both types is nearly identical. Trace element data (Rb, Y, Th) indicate the medium-grained granite crystallized from a more evolved melt than did the coarse-grained granite. Trace element data (Y, Th, Ba, Sr) for the coarsegrained granite show it to be slightly zoned from the bottom upward to the contact with the medium-grained granite at 731 m.

Copyright 1986 University of Chicago Press. Available on publisher's site at

Citation Information
Charles J Vitaliano, George R McCormick, Peter Dahl and Yoram Eckstein. "Granitic Rocks from 3 Deep Drill-Holes, Illinois" Journal of Geology Vol. 94 Iss. 4 (1986) p. 594 - 599
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