Boundary between Archean greenstone and gneiss terranes in northern Wisconsin and Michigan

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doi: 10.1130/SPE182-p113
Authors:Sims, P. K.
Author Affiliations:Primary:
U. S. Geol. Surv., Denver, CO, United States
Other:
State Univ. N.Y., United States
Volume Title:Selected studies of Archean gneisses and lower Proterozoic rocks, southern Canadian Shield
Volume Authors:Morey, G. B., editor; Hanson, Gilbert N.
Source:Selected studies of Archean gneisses and lower Proterozoic rocks, southern Canadian Shield, edited by G. B. Morey and Gilbert N. Hanson. Special Paper - Geological Society of America, 182, p.113-124. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0072-1077. ISBN: 0-8137-2182-2
Publication Date:1980
Note:In English. 52 refs.; illus. incl. geol. sketch maps
Summary:New geological and geochronological data clearly establish that the two Archaean basement rock terrains recognized previously in Minnesota also occur in N Wisconsin and Michigan, on the E side of the midcontinent gravity high. Greenstone-granite complexes (about 2700 m.y. old) that are remarkably similar to those in the greenstone terrain of N Minnesota are present on the S side of the Gogebic Range in N Wisconsin and adjacent Michigan and in the N complex of the Marquette district. Migmatitic gneisses and amphibolite, which are similar to the high-grade rocks in the gneiss terrain in S Minnesota, are sporadically exposed S of the greenstone terrain and appear to compose the basement in most of N and central Wisconsin and N Michigan. [A.P.]
Subjects:Absolute age; Archean; Dates; Dikes; Distribution; Gneisses; Greenstone; Intrusions; Mafic composition; Metamorphic rocks; Petrology; Plutons; Precambrian; Schists; Stratigraphic boundary; Stratigraphy; Canadian Shield; Great Lakes region; Marquette County Michigan; Marquette Michigan; Michigan; Michigan Upper Peninsula; North America; Southern Province; United States; Wisconsin; Gogebic Range; Marenisco; Mellen; Watersmeet
Coordinates:N440000 N480000 W0870000 W0960000
Abstract Numbers:82M/2084
Record ID:1982024804
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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