Geology and geochronology of Paleoarchean gneisses in the Minnesota River Valley

2011 ◽  
pp. 47-62 ◽  
Author(s):  
R.L. Bauer ◽  
M.E. Bickford ◽  
A.M. Satkoski ◽  
D.L. Southwick ◽  
S.D. Samson
Keyword(s):  
River Valley ◽  
Minnesota River ◽  
Minnesota River Valley

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

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

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

LANDSLIDE CHARACTERIZATION IN THE LOWER MINNESOTA RIVER VALLEY

2020 ◽  
Author(s):  
Kiara Krippner ◽  
◽  
Matt Allison ◽  
Laura D. Triplett ◽  
Julie K. Bartley ◽  
...  
Keyword(s):  
River Valley ◽  
Minnesota River ◽  
Minnesota River Valley

Metamorphic conditions of late Archean high-grade gneisses, Minnesota River valley, U.S.A.

1986 ◽  
Vol 23 (5) ◽  
pp. 633-645 ◽  
Author(s):  
D. P. Moecher ◽  
D. Perkins III ◽  
P. J. Leier-Englehardt ◽  
L. G. Medaris Jr.
Keyword(s):  
Granulite Facies ◽  
River Valley ◽  
High Grade ◽  
Compositional Zoning ◽  
Minnesota River ◽  
Large Pressure ◽  
Temperature And Pressure ◽  
Minnesota River Valley ◽  
Metamorphic Gradient ◽  
Real Temperature

A detailed, comparative geothermobarometric analysis for the Minnesota River valley (MRV) Archean gneiss and migmatite terrane yields temperature and pressure ranges of 650–750 °C and 4.5–7.5 kbar (450–750 MPa), based on garnet–biotite, two-feldspar, garnet–clinopyroxene, garnet–cordierite, orthopyroxene–clinopyroxene, and magnetite–ilmenite thermometry and garnet–cordierite–sillimanite–quartz and garnet–orthopyroxene–plagioclase–quartz barometry. The temperature variation observed is interpreted to be primarily a result of varying degrees of re-equilibration of assemblages with falling temperature but may include real temperature variations between areas exhibiting granulite facies versus upper amphibolite facies–migmatitic lithologies. The large pressure range is primarily a result of differences among the pressure calibrations applied but may also record variations in pressure within the terrane. Lower pressures are consistent with the occurrence of cordierite-bearing assemblages at Granite Falls and Delhi. Based on the compositional zoning patterns determined in garnet adjacent to clinopyroxene, orthopyroxene, cordierite, and biotite and in orthopyroxene adjacent to garnet, the granulites are interpreted to have experienced nearly isobaric cooling, suggesting a magmatically influenced thermal regime may have been responsible for the high-grade conditions and relatively high transient metamorphic gradient (32 °C/km) attained in the MRV.

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