scholarly journals METAMORPHISM OF THE CANADIAN SHIELD, ONTARIO, CANADA. II. PROTEROZOIC METAMORPHIC HISTORY

2000 ◽  
Vol 38 (2) ◽  
pp. 319-344 ◽  
Author(s):  
R. M. Easton
Keyword(s):  
Canadian Shield ◽  
Metamorphic History

Geochronology of the Canadian Shield in Northeastern Alberta II. Charles–Andrew–Colin Lakes Area

1972 ◽  
Vol 9 (7) ◽  
pp. 863-881 ◽  
Author(s):  
H. Baadsgaard ◽  
John D. Godfrey
Keyword(s):  
Plastic Deformation ◽  
Fault Zone ◽  
Early Phase ◽  
Uranium Mineralization ◽  
Canadian Shield ◽  
Compositional Heterogeneity ◽  
Metamorphic History ◽  
History Of ◽  
Northeastern Alberta ◽  
Broad Outline

The broad outline of the tectonic–metamorphic history of this area is reasonably clear. Whole rock U–Pb, mineral U–Pb, whole rock Rb–Sr, mineral Rb–Sr, and mineral K–Ar data have resulted in the recognition of a narrow discontinuous N–S zone of Archean (> 2550 m.y.) granitic material which may predate the surrounding widespread migmatitic–gneissic complex. Other N–S belts of younger granitic to dioritic plutons (1900 m.y.) intrude the gneissic complex. A last severe thermal metamorphic event sharply 'reset' mica K–Ar dates for all bodies in the area to 1790 ± 40 m.y. The recently identified Archean belt is located in the Allan fault zone: a complex major zone of weakness which has undergone repeated activation involving deep seated folding, mylonitization, and multiple intrusion, with late plastic deformation and recrystallization of the mylonite belts. The unraveling of the tectonic–metamorphic history of the area is greatly complicated by multiple metamorphic effects and the compositional heterogeneity of the para– and ortho–gneissic materials of the migmatitic–gneissic complex. Local uranium mineralization in this area is geochronologically related to intrusion of the younger granites and is essentially contemporaneous with the main early phase of uranium deposition in the Uranium City area of Saskatchewan.

Cadmium concentrations of crustacean zooplankton of acidified and nonacidified Canadian Shield lakes

1990 ◽  
Vol 24 (9) ◽  
pp. 1367-1372 ◽  
Author(s):  
Norman D. Yan ◽  
Gerald L. Mackie ◽  
Peter J. Dillon
Keyword(s):  
Canadian Shield ◽  
Crustacean Zooplankton ◽  
Shield Lakes

Tectono-metamorphic history of the ophiolitic Lento unit (northern Corsica): evidences for the complexity of accretion-exhumation processes in a fossil subduction system

2007 ◽  
Vol 20 (1-2) ◽  
pp. 99-118 ◽  
Author(s):  
Nicola Levi ◽  
Alessandro Malasoma ◽  
Michele Marroni ◽  
Luca Pandolfi ◽  
Matteo Paperini
Keyword(s):  
Metamorphic History ◽  
History Of ◽  
Subduction System

The Effect of the Canadian Shield on Cloud-to-Ground Lightning Density

2017 ◽  
Vol 55 (3) ◽  
pp. 133-143 ◽  
Author(s):  
Daniel Brown ◽  
Gerhard Reuter
Keyword(s):  
Canadian Shield ◽  
Cloud To Ground Lightning
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