scholarly journals Seismic anisotropy of the Archean crust in the Minnesota River Valley, Superior Province

2014 ◽  
Vol 41 (5) ◽  
pp. 1514-1522 ◽  
Author(s):  
Eric C. Ferré ◽  
Aude Gébelin ◽  
James A. Conder ◽  
Nik Christensen ◽  
Justin D. Wood ◽  
...  
Keyword(s):  
Seismic Anisotropy ◽  
River Valley ◽  
Superior Province ◽  
Minnesota River ◽  
Archean Crust ◽  
Minnesota River Valley

Block and shear-zone architecture of the Minnesota River Valley subprovince: implications for late Archean accretionary tectonics

1996 ◽  
Vol 33 (6) ◽  
pp. 831-847 ◽  
Author(s):  
D. L. Southwick ◽  
Val W. Chandler
Keyword(s):  
Regional Scale ◽  
Shear Zones ◽  
River Valley ◽  
Superior Province ◽  
Tectonic Zone ◽  
Minnesota River ◽  
The North ◽  
Geophysical Anomalies ◽  
Superior Craton ◽  
Minnesota River Valley

The Minnesota River Valley subprovince of the Superior Province is an Archean gneiss terrane composed internally of four crustal blocks bounded by three zones of east-northeast-trending linear geophysical anomalies. Two of the block-bounding zones are verified regional-scale shears. The geological nature of the third boundary has not been established. Potential-field geophysical models portray the boundary zones as moderately north-dipping surfaces or thin slabs similar in strike and dip to the Morris fault segment of the Great Lakes tectonic zone at the north margin of the subprovince. The central two blocks of the subprovince (Morton and Montevideo) are predominantly high-grade quartzofeldspathic gneiss, some as old as 3.6 Ga, and late-tectonic granite. The northern and southern blocks (Benson and Jeffers, respectively) are judged to contain less gneiss than the central blocks and a larger diversity of syntectonic and late-tectonic plutons. A belt of moderately metamorphosed mafic and ultramafic rocks having some attributes of a dismembered ophiolite is partly within the boundary zone between the Morton and Montevideo blocks. This and the other block boundaries are interpreted as late Archean structures that were reactivated in the Early Proterozoic. The Minnesota River Valley subprovince is interpreted as a late accretionary addition to the Superior Province. Because it was continental crust, it was not subductible when it impinged on the convergent southern margin of the Superior Craton in late Archean time, and it may have accommodated to convergent-margin stresses by dividing into blocks and shear zones capable of independent movement.

Paleoarchean Gneisses in the Minnesota River Valley and Northern Michigan, USA

2019 ◽  
pp. 677-702
Author(s):  
Marion E. Bickford ◽  
Aaron M. Satkoski ◽  
Scott D. Samson ◽  
Joseph L. Wooden ◽  
Robert L. Bauer ◽  
...  
Keyword(s):  
River Valley ◽  
Minnesota River ◽  
Minnesota River Valley ◽  
Northern Michigan

U-Pb ages on single zircons from the Early Precambrian rocks of West Greenland and the Minnesota River Valley

1977 ◽  
Vol 35 (3) ◽  
pp. 449-453 ◽  
Author(s):  
Annie Michard-Vitrac ◽  
Joël Lancelot ◽  
Claude J. Allègre ◽  
Stephen Moorbath
Keyword(s):  
River Valley ◽  
Early Precambrian ◽  
West Greenland ◽  
Precambrian Rocks ◽  
Minnesota River ◽  
Minnesota River Valley

Geochemical and Hf–Nd isotopic constraints on the crustal evolution of Archean rocks from the Minnesota River Valley, USA

2013 ◽  
Vol 224 ◽  
pp. 36-50 ◽  
Author(s):  
A.M. Satkoski ◽  
M.E. Bickford ◽  
S.D. Samson ◽  
R.L. Bauer ◽  
P.A. Mueller ◽  
...  
Keyword(s):  
River Valley ◽  
Crustal Evolution ◽  
Minnesota River ◽  
Minnesota River Valley ◽  
Isotopic Constraints
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