Re-Os Systematics of Cr-Pge Mineralized Zones in the Partridge River and South Kawishiwi Intrusions and the Layered Series at Duluth, Duluth Complex, Northeastern Minnesota
Loading...
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Re-Os Systematics of Cr-Pge Mineralized Zones in the Partridge River and South Kawishiwi Intrusions and the Layered Series at Duluth, Duluth Complex, Northeastern Minnesota
Published Date
2003-09
Publisher
University of Minnesota Duluth
Type
Technical Report
Abstract
This report is a portion of a project on the relationship between chromium and platinum-group
elements (PGEs) in the Duluth Complex (Fig. 1). The rhenium-osmium and oxygen isotope data in
this report were produced from the magnetic fraction of samples in Table 1, where possible. These
data are used to evaluate origin of chromium and related PGEs from various parts of the basal zone
of the Duluth Complex (Fig. 1).
Chromium mineralization associated with PGEs in the Duluth Complex was first recognized by
Sabelin and Iwasaki (1985, 1986) and Sabelin (1985, 1987) in drill hole Du-15 from the Birch Lake
area (BLA). The presence of chromium spinels was noted earlier by Weiblen and Morey (1976) at
the Spruce Road deposit. Severson (1995) identified chromium and platinum mineralization in drill
hole SL-19A northeast of the Water Hen deposit. Also, Severson (1991) identified Cr-rich spinels
in the Local Boy ore zone of the Babbitt deposit. Hauck et al. (in prep.; Hauck unpubl. data; Hauck
et al., 1998) have identified a variety of Cr-rich spinels, e.g., Cr-magnetite, Cr-hercynite, Cr-Timagnetite,
in the BLA, not all of which are directly associated with PGE mineralization. Cr-Timagnetite
+ Cr-pleonaste was identified by Sassani (1992) in the Fish Lake area of the Layered Series
at Duluth. In addition, Heine et al. (1998) reported 1.64 % Cr2O3 in saprolite in drill hole 265 3/1
P2 in a Keweenawan-age (?) ultramafic body in Stearns County in central Minnesota.
Samples for this study were collected from oxide-bearing, semi-massive, and massive oxide zones or
layers to answer some fundamental questions about the origin of the Cr-PGE mineralization within
the Duluth Complex. Results of the sample from Stearns County are not discussed in this report.
Description
Related to
Replaces
License
Collections
Series/Report Number
Funding information
Funded by the Permanent University Trust Fund; Natural Resources Research Institute, University of Minnesota Duluth, 5013 Miller Trunk Highway, Duluth, MN 55811-1442; and the Department of Geological Sciences, Indiana University, 1005 East 10th Street, Bloomington, IN 47405.
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Shafer, Paula; Hauck, Steven A; Severson, Mark J. (2003). Re-Os Systematics of Cr-Pge Mineralized Zones in the Partridge River and South Kawishiwi Intrusions and the Layered Series at Duluth, Duluth Complex, Northeastern Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/187086.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.