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TitleQuaternary geology of southern Melville Peninsula, Nunavut
DownloadDownloads
AuthorDredge, L A
SourceGeological Survey of Canada, Bulletin 561, 2002; 1 CD-ROM, https://doi.org/10.4095/213215
Year2002
PublisherNatural Resources Canada
Documentserial
Lang.English
MapsPublication contains 5 maps
Map Info.surficial geology, glacial deposits and features, 1:200,000
Mediapaper; on-line; digital; CD-ROM
RelatedThis publication contains the following publications
File formatreadme / lisez-moi
File formatpdf
ProvinceNunavut
NTS46I; 46J; 46K; 46L; 46M; 46N; 46O; 46P
AreaMelville Island
Lat/Long WENS-87.0000 -81.0000 68.0000 66.0000
Subjectssurficial geology/geomorphology; geochemistry; glacial features; glacial deposits; bedrock geology; glaciation; physiography; felsenmeer; tills; boulders; till analyses; till deposits; glacial landforms; glaciofluvial deposits; eskers; kames; glaciolacustrine deposits; marine deposits; eolian deposits; glacial history; deglaciation; sea level changes; weathering; till geochemistry; gossans; Central Melville Plateau; Hurd Plateau; Rae Isthmus; Foxe Basin; Quaternary
Illustrationstables; sketch maps; aerial photographs; photographs; histograms; ternary diagrams
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Image
Released2002 03 01; 2009 03 02; 2009 03 02
AbstractQuaternary glaciations have created sandy granitic till, calcareous silty till, calcareous glaciomarine deposits, raised marine beaches, and scoured rock outcrop. Accompanying maps are used to reconstruct glacial history. Limestone erratics on uplands suggest extensive Foxe Ice prior to the last glaciation. Clay minerals in regolith and upland block fields indicate an ensuing weathering interval, followed by a periglacial period. During the Foxe (=Wisconsin) Glaciation, ice on uplands coalesced to form a local ice sheet (Melville Ice). This ice sheet was later subsumed by Foxe Ice, although a subsidiary divide persisted on the peninsula, blocking and diverting Foxe Ice flow. Cold-based zones and local ice divides preserved the regolith on the plateaus. Some areas gradually became warm-based. Deglaciation began with penetration of a marine re-entrant south of Wales Island about 8600 years ago, with ice streaming through Rae Isthmus and development of Melville Moraine as far south as Matheson River. Marine limit elevations suggest rapid, progressive breakup of Foxe Ice 6800. Geochemical signatures from till and gossan samples are related to rock lithology, directions and styles of glacial transport, and length of time available for weathering. Tills within areas controlled by Foxe Basin ice are far-travelled, while those beneath the Melville Ice divide reflect the composition of underlying rock types. Lead/zinc ratios in regolith, till, and gossans indicate postglacial geochemical reactivity. Gossans associated with Zn, Cd, Ni, and Cu anomalies are preferentially found in rocks of the Prince Albert Group, and schist-marble contacts in the Penrhyn Group.
GEOSCAN ID213215