This guidebook has been prepared for the field conference and symposium on "The Petrology and
Metallogeny of Volcanic and Intrusive Rocks of the Midcontinent Rift System" that will be held
in Duluth, Minnesota in August of 1995 as part of International Geological Correlation Program
(IGCP) Project 336 ("Petrology and Metallogeny of Mafic and Ultramafic Magmatism"). The
four-year-Iong IGCP project was begun in 1992 to investigate the petrology and metallogeny of
various intracontinental mafic igneous provinces with an overall goal of establishing geological
criteria for targeting mineral deposits in such environments.
The principal goal of the 1995 meeting is to showcase to the international scientific and
exploration communities the significant advances in our understanding of the structure,
mineralization, and magmatic history of the Midcontinent rift. Toward this end, three field trips
have been organized around the three-day symposium to be held August 25-27, 1995 in Duluth.
The field trips are designed to provide a broad overview of the geologic framework of the
Midcontinent rift, where it is best exposed in the western Lake Superior region. Field trip I
(August 19 -24) looks at the physical volcanology of the flood basalts exposed on Isle Royale.
Field trip II (August 22-24) highlights the stratigraphy, structure and mineralization of the
volcanic and sedimentary rocks forming the southern limb of the Midcontinent rift in Wisconsin
and Upper Michigan. The post-symposium field trip ill (August 28-September 1) focusses on
the geology and ore deposits associated with the intrusive rocks of the Midcontinent rift exposed
along the north shore of Lake Superior in Minnesota and Ontario.
PREPARED FOR THE 1995 INTERNATIONAL GEOLOGIC CORRELATION PROGRAM (IGCP) PROJECT 336 FIELD CONFERENCE AND SYMPOSIUM, DULUTH, MINNESOTA
Miller, James D., Jr..
Guidebook 20. Field Trip Guidebook for the Geology and Ore Deposits of the Midcontinent Rift in the Lake Superior Region.
Minnesota Geological Survey.
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