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TitleVolcanic stratigraphy and structural geology of the area of the Boston gold deposit, Hope Bay volcanic belt, Nunavut
AuthorSherlock, R L; Sandeman, H A
SourceGeological Survey of Canada, Current Research (Online) no. 2004-C2, 2004, 11 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in the following publications
File formatpdf (Adobe Acrobat Reader)
NTS76O/09; 76O/10; 76O/15; 76O/16; 77A/03; 77A/06
AreaHope Bay; Boston
Lat/Long WENS-107.0000 -106.0000 68.5000 67.5000
Subjectsstructural geology; stratigraphy; structural features; folds; igneous rocks; volcanic rocks; bedrock geology; greenstone belts; granites; metamorphic rocks; metasedimentary rocks; Archean; lithology; gold; mineralization; deformation; Boston gold deposit; Hope Bay volcanic belt; Precambrian
Illustrationssketch maps; photographs
Released2004 05 01
AbstractThe Boston gold deposit, located in the southern portion of the Hope Bay volcanic belt, is the largest known gold deposit in the belt. Rock types in the area of the deposit are dominated by mafic volcanic rocks, with smaller amounts of felsic volcanic and sedimentary rocks. The strata are folded about a large south-plunging F2 synformal anticline cored by mafic pillowed flows that host the Boston deposit. Gold
mineralization is associated with a complex anastomosing high-strain zone which is roughly axial-planar to the main anticline and is tentatively interpreted as the latest expression of D2 strain. Overprinting the main (D2) structural elements is a series of cross folds (F3). The folding event that produced the latter created a large embayment of supracrustal rocks into the tonalite-granodiorite on the eastern side of the volcanic belt, and also deformed the gold mineralization and associated alteration at the Boston deposit.