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TitleDetailed structural studies, Gibson Lake-Cross Bay-MacQuoid Lake area, Northwest Territories (Kivalliq region, Nunavut)
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorRyan, J J; Hanmer, S; Tella, S; Sandeman, H A
SourceCanadian Shield/Bouclier canadien; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1999-C, 1999 p. 87-96, Open Access logo Open Access
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Canadian Shield
File formatpdf
NTS55M/10NE; 55M/09; 55M/16; 55N/05NW; 55N/05NE; 55N/06NW; 55N/06NE; 55N/11; 55N/12; 55N/13; 55N/14
AreaCross Bay; Gibson Lake; Muskox Lake; Chesterfield Inlet; Big Lake
Lat/Long WENS -94.6667 -93.0000 64.0000 63.3333
Subjectsstructural geology; igneous and metamorphic petrology; Archean; foliation; folds; structural trends; shear zones; faults; faults, strike-slip; deformation; structural features; metamorphism; lithology; fabric analyses; mylonites; igneous rocks; granites; plutonic rocks; metamorphic rocks; gneisses; structural interpretations; Churchill Province; Big Lake shear zone; Gibson-MacQuoid Homocline; Cross Bay Plutonic Complex; Precambrian; Proterozoic
Illustrationssketch maps; photographs
ProgramWestern Churchill NATMAP Project
Released1999 02 01
AbstractThe Gibson Lake-Cross Bay-MacQuoid Lake area comprises a multiply deformed Archean terrane, tectonothermally reworked in the Paleoproterozoic. Multiple foliations in the western volcanic belt illustrate that the regional foliation is a second generation feature (S2), formed by transposition of layering and a layer-parallel foliation (S1). The S2 appears to have developed at ca. 2.68 Ga. Two subsequent generations of folds modified the S2 during the Paleoproterozoic. South-plunging F3 folds are restricted to the Cross Bay complex, whereas east- northeast-trending, F4 folds control much of the map pattern in the volcanic belt and southeastern part of the Cross Bay complex. The complex is bounded to the south by the Big lake shear zone, a 50 km long, dextral, strike- slip structure. The main phase of deformation and metamorphism in the shear zone is Paleoproterozoic, and its western segment is stitched by a late-stage (possibly ca. 1.83 Ga) granite.

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