Oxide, Sulphide and Platinum Mineralogy of the South Kawishiwi and Partridge River Intrusions of the Duluth Layered Intrusion Complex Minnesota, U.S.A.
1998
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Oxide, Sulphide and Platinum Mineralogy of the South Kawishiwi and Partridge River Intrusions of the Duluth Layered Intrusion Complex Minnesota, U.S.A.
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1998
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University of Minnesota Duluth
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Technical Report
Abstract
The Duluth Complex in north-east Minnesota, U.S.A., is one of the largest basic layered intrusion
complexes in the world, occupying an area of about 4700 km2
• It is composed of several separate
intrusions which discharged via the Midcontinent Rift System about 1100 ± 15 Ma ago.
Characteristic of the complex is the occurrence of mineralizations containing Cr-Fe-Ti-V oxides, CuNi
sulphides and platinum group elements in the troctolitic South Kawishiwi and Partridge River
Intrusions on its western and northern edges.
The purpose of this work is to study and compare these two adjacent intrusions in terms of their
platinum mineralogy and to provide the basic data necessary for determining the origins of their
mineralizations. As the platinum mineralizations are closely connected with oxide and sulphide
mineralizations, the latter are also examined in detail. The work is based to a great extent on the
available literature and on a set of 221 core samples taken from the two intrusions. A total of 119
whole rock x-ray fluorescence analyses, 253 WDS x-ray microanalyses, 68 EDS analyses and 499
scanning electron microscope analyses ( also employing the EDS method) were performed on these
cores for the determination of oxides, sulphides and platinum group minerals.
The mineralizations of the Duluth Layered Intrusion Complex resemble other corresponding ones
in Cu and Ni-bearing basic igneous rocks in their ore mineralogy and in the rock types present. The
mineralizations exhibit properties suggestive of a role for both magmatic and hydrothermal processes
in the distribution of platinum group elements. The results obtained here are consistent with earlier
findings.
Description
Komppa, UE. 1998. Oxide, sulphide and platinum mineralogy of the South Kawishiwi and Partridge
River Intrusions of the Duluth Layered Intrusion Complex, Minnesota, US.A. Dissertation for the
degree of Master of Science in geology and mineralogy (no. 772668), presented to the Department
of Geosciences, University of Oulu. 104 pp., 21 illustrations, 8 tables and 8 appendices. English Translation by Malcolm Hicks, 2000. Report of Investigation, NRRI/RI-2002/02, January 2002
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Funded by the University of Oulu, Department of Geosciences, Oulu, Finland; The Minerals Diversification Plan of the
Minnesota Legislature, Administered by the Minerals Coordinating Committee; and the Natural
Resources Research Institute, University of Minnesota Duluth, 5013 Miller Trunk Highway, Duluth MN 55811-1442
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Komppa, Ulla. (1998). Oxide, Sulphide and Platinum Mineralogy of the South Kawishiwi and Partridge River Intrusions of the Duluth Layered Intrusion Complex Minnesota, U.S.A.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/193713.
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