- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
North America
-
Canadian Shield
-
Superior Province (1)
-
-
-
South America
-
Brazil (1)
-
-
United States
-
Minnesota (1)
-
New Mexico (1)
-
Texas
-
Texas Panhandle (1)
-
West Texas (1)
-
-
-
-
elements, isotopes
-
isotope ratios (1)
-
isotopes
-
stable isotopes
-
Nd-144/Nd-143 (1)
-
-
-
metals
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
-
geochronology methods
-
Sm/Nd (1)
-
-
geologic age
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Paleoproterozoic (1)
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
gabbros (1)
-
granites
-
A-type granites (1)
-
-
-
volcanic rocks
-
rhyolites (1)
-
-
-
-
metamorphic rocks
-
metamorphic rocks (1)
-
-
Primary terms
-
crust (2)
-
geochemistry (1)
-
igneous rocks
-
plutonic rocks
-
gabbros (1)
-
granites
-
A-type granites (1)
-
-
-
volcanic rocks
-
rhyolites (1)
-
-
-
intrusions (1)
-
isotopes
-
stable isotopes
-
Nd-144/Nd-143 (1)
-
-
-
metals
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
metamorphic rocks (1)
-
metamorphism (1)
-
North America
-
Canadian Shield
-
Superior Province (1)
-
-
-
orogeny (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Paleoproterozoic (1)
-
-
-
-
South America
-
Brazil (1)
-
-
symposia (1)
-
tectonics (1)
-
tectonophysics (1)
-
United States
-
Minnesota (1)
-
New Mexico (1)
-
Texas
-
Texas Panhandle (1)
-
West Texas (1)
-
-
-
Late Paleoproterozoic deformational, metamorphic, and magmatic history of east-central Minnesota
Abstract This field trip examines deformed Archean basement, and variably metamorphosed supracrustal rocks and an exhumed midcrustal batholith of late Paleoproterozoic age in east-central Minnesota. Collectively, these rocks reveal an approximately 100 m.y. geologic history of crustal growth and stabilization of this part of the craton. The Penokean orogen in Minnesota consists of a northern foreland basin (the Animikie basin), a medial fold-thrust belt, and a southern high-grade metamorphic and plutonic terrane, representing two major orogenic events: the Penokean (geon 18) and Yavapai (geon 17) orogenies. The 1870–1830 Ma Penokean orogenic rocks are part of a belt of juvenile crust accreted onto the southern margin of Laurentia-Baltic continent during the late Paleoproterozoic. Metamorphism along the southern margin of the Archean Superior province has been historically attributed to the Penokean Orogeny, in a corridor of amphibolite-facies rocks which record 1.86–1.80 Ga (geon 18) metamorphic ages that correspond to the culmination of arc accretion. However, a widespread geon 17 amphibolite-facies metamorphic overprint is also recorded along the regions of greatest thickening of the Penokean crust, which corresponds to the tectonically buried Archean-Proterozoic continental margin. This was also the locus of emplacement of the voluminous east-central Minnesota batholith, composed of some twenty separate intrusions that range from mafic to dominantly felsic-intermediate compositions. Most of these are Yavapai in age, with emplacement ages between 1787 and 1772 Ma.