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Ishpeming Greenstone belt (Marquette Greenstone belt), Marquette Co., Michigan, USA

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 46° North , 87° West (est.)
Margin of Error:~14km
Köppen climate type:Dfb : Warm-summer humid continental climate


The Ishpeming greenstone belt occupies the southeast corner of the northern complex of the Marquette district. The northern complex comprises the Archean crustal rocks north of the Great Lakes tectonic zone, an Archean continent-continent suture. Although the complex is composed of a wide variety of Archean igneous, sedimentary, and metamorphic rocks, it is best characterized as a greenstone-granite terrane. The greenstone part occupies about an eighth of the surface area of the complex. These rocks are part of the Wawa subprovince of the Canadian Shield as defined by, and may be the southernmost Archean greenstone belt in the Superior province (Bornhorst 1993).

NOTE: The name Marquette Greenstone belt was originally applied to the belt of dominantly Archean volcanic rocks which underlies an area of about 125 square miles in northern Marquette County, Michigan. The belt occupies the eastern part of the northern complex, an extensive terrane of Archean granite-greenstone north of the Marquette trough. The Marquette Greenstone belt represents the southwestern extension of the Wawa Subprovince of the Superior Geologic Province of the Canadian Shield. This name was superseded by the name Ishpeming Greenstone belt.



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Mineral List

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44 valid minerals.

Rock Types Recorded

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Localities in this Region


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References

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Bornhorst, T.J., 1988, Geological Overview of the Marquette Greenstone Belt, Michigan: Proceedings of the Institute on Lake Superior Geology, v. 34, Part 2 - Field Trip Guidebook, pp. A1-A18.
Archean geology of the northern block of the Ishpeming Greenstone Belt,
Marquette County, Michigan / by R.C. Johnson and T.J. Bornhorst. 1991(Contributions to Precambrian geology of Lake Superior region ; ch. F) (U.S. Geological Survey bulletin ; 1904-F)
Geology of volcanic rocks in the south half of the Ishpeming greenstone belt, Michigan / by Theodore J. Bornhorst and Rodney C. Johnson. 1993(Contributions to Precambrian geology of Lake Superior region ;
ch. P) (U.S. Geological Survey bulletin ; 1904-P)

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