scholarly journals New bedrock mapping and preliminary U/Pb geochronology in the Walmsley Lake area, southeastern Slave Province, Northwest Territories

2002 ◽  
Author(s):  
K MacLachaln ◽  
C Relf ◽  
S Cairns ◽  
J Renaud ◽  
A Mills
Keyword(s):  
Northwest Territories ◽  
Lake Area ◽  
Slave Province

scholarly journals New multidisciplinary geological investigations in the Walmsley Lake area, southeastern Slave Province, Northwest Territories

2001 ◽  
Author(s):  
K MacLachlan ◽  
C Relf ◽  
S Cairns ◽  
F Hardy ◽  
B Davis
Keyword(s):  
Northwest Territories ◽  
Lake Area ◽  
Slave Province

scholarly journals U-Pb geochronology of Wijinnedi Lake area, Slave Province, District of Mackenzie, Northwest Territories

1998 ◽  
Author(s):  
M E Villeneuve ◽  
J B Henderson
Keyword(s):  
Northwest Territories ◽  
Lake Area ◽  
Slave Province

Fabrics and Deformation of Archean Metasedimentary Rocks, Ross Lake – Gordon Lake Area, Slave Province, Northwest Territories

1975 ◽  
Vol 12 (5) ◽  
pp. 765-776 ◽  
Author(s):  
W. K. Fyson
Keyword(s):  
Northwest Territories ◽  
Small Scale ◽  
Lake Area ◽  
Metasedimentary Rocks ◽  
Slave Province ◽  
Complex Part ◽  
Scale Structures ◽  
Inclusion Trails ◽  
Lake Gordon ◽  
Small Scale Structures

Metagreywackes, which lie stratigraphically above metavolcanics fringing a granitic complex (part basement), exhibit late Archean multiphase fold structures. F1 folds are large linear depressions and anticlinal culminations trending partly concordant with margins of the granitic complex. Open to isoclinal F2 folds vary and curve in trend. Though usually near upright, some F2 folds are overturned away from the complex and others towards F1 depressions. F3 folds are small-scale structures not present in most outcrops, but throughout a large region they are accompanied by a steep S3 axial-plane schistosity striking NW to N.Original orientations of an S2 schistosity, axial planar to F2 folds, are preserved as inclusion trails in biotite porphyroblasts. Angular deflections from the trails show that regional horizontal flattening across the S3 schistosity formed the F3 folds and tightened curved trends of F2 folds. Estimates of strain from the fabrics indicate no increase near the complex.As for folds in other Archean terrains, F1 and F2 folds could have developed mainly as gravity structures during diapiric uprise of a granitic basement. In contrast, the F3 structures may reflect horizontal movements of early crustal plates.

scholarly journals Structure and stratigraphy of the Indin Lake area, western Slave Province, Northwest Territories

1995 ◽  
Author(s):  
S J Pehrsson ◽  
J W Grant ◽  
A C Dorval ◽  
M Lewis
Keyword(s):  
Northwest Territories ◽  
Lake Area ◽  
Slave Province

Late Archean tectono-magmatic evolution of the central Slave Province, Northwest Territories

1992 ◽  
Vol 29 (10) ◽  
pp. 2156-2170 ◽  
Author(s):  
J. E. King ◽  
W. J. Davis ◽  
C. Relf
Keyword(s):  
Northwest Territories ◽  
Lake Area ◽  
Crustal Melting ◽  
Magmatic Evolution ◽  
Calc Alkaline ◽  
Thermal Peak ◽  
Suprasubduction Zone ◽  
Slave Province ◽  
Peraluminous Granites ◽  
Intense Deformation

An early tectono-stratigraphic and late plutonic assemblage are distinguished in the central part of the Archean Slave Province (Contwoyto Lake area) on the basis of their relationship to deformation and metamorphic episodes, and by geochemical characteristics. The older assemblage, which predates the onset of intense deformation and the thermal peak of metamorphism, comprises 2.68–2.65 Ga calc-alkaline volcanic and plutonic rocks, as well as extensive turbidites. The younger assemblage comprises ca. 2.61–2.58 Ga plutonic units that were emplaced during and after deformation (D,–D3) and the thermal peak of metamorphism. Compositions of the late plutonic units vary systematically with time of intrusion from an early, calc-alkaline, diorite – tonalite suite to late peraluminous granites. The early assemblage is interpreted to represent remnants of an island arc (or arcs) overlain by turbidites and accreted during D1 and D2. The later assemblage is interpreted as a product of late- to post-accretion, suprasubduction-zone magmatism and associated crustal melting.

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