Geologic Mapping And Structural Analysis Of The Peter Mitchell Mine
1996-02
Title
Geologic Mapping And Structural Analysis Of The Peter Mitchell Mine
Authors
Published Date
1996-02
Publisher
University of Minnesota Duluth
Type
Technical Report
Abstract
At least 17 faults are located within the Peter Mitchell Mine. Most of the faults trend north
to north-northeast; four faults trend northwest. The faults are near-vertical, with offsets ranging from
<5 feet to >50 feet. Thirteen of the faults display a "scissors-type" offset in that the relative
displacement along the length of the fault is more pronounced toward one end of the fault. In 10
faults, the amount of offset increases from north to south toward the Duluth Complex. Three faults
exhibit increased amounts of offset away from the Duluth Complex. Collectively, the relative motion
along the majority of the faults indicate that they were formed (and reactivated?) during emplacement
of the Duluth Complex.
Five basaltic dikes occur within the mine area. Only one of the dikes occupies a fault zone;
the remainder are intruded along various joint sets. The age of the dikes is inferred to be late-Duluth
Complex. Several large-scale folds also occur within the mine area. They trend northwest and
diminish in intensity away from the Complex, indicating that folding was initiated during emplacement
of the Complex.
Description
Project No. 563102
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Funding information
University of Minnesota Duluth, Natural Resources Research Institute, 5013 Miller Trunk Highway, Duluth, MN 55811-1442; Funded by Minnesota Technology, Inc. and Northshore Mining Corporation
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Previously Published Citation
Suggested citation
Severson, Mark J. (1996). Geologic Mapping And Structural Analysis Of The Peter Mitchell Mine. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/188418.
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