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TitleGeochemistry of an alkaline, ca. 1885 Ma K-feldspar-porphyritic, monzonitic to syenogranitic suite, northeastern Kisseynew Domain, Manitoba (parts of NTS 63O)
AuthorWhalen, J B; Zwanzig, H V; Percival, J A; Rayner, R
SourceManitoba Science, Technology, Energy and Mines, Manitoba Geological Survey, Report of Activities 2008, 2008 p. 66-78
Alt SeriesEarth Sciences Sector, Contribution Series 20080412
AreaNelson House
Lat/Long WENS-100.0000 -98.0000 56.0000 55.0000
Subjectsgeochemistry; igneous and metamorphic petrology; geochemical surveys; trace element geochemistry; major element geochemistry; bedrock geology; igneous rocks; intrusive rocks; volcanic rocks; monzonites; granites; syenites; magmatism; mantle; lithosphere; Archean; Kisseynew Domain; Footprint Lake plutonic suite; syenogranites; Precambrian; Proterozoic
Illustrationslocation maps; photographs; plots; tables
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
AbstractRecent work in the northeastern Kisseynew Domain has provided evidence that this area is underlain by or intercalated with Superior Province basement that is exposed in structural culminations. Where examined, this basement is mantled by Ospwagan-like paragneiss
that may be an exploration target for Thompson-type Ni deposits. Closely associated with the basement culminations is the ca. 1885 Ma K-feldspar - porphyritic Footprint Lake plutonic suite (FLPS), which ranges in composition from syenite - monzonite to syenogranite - monzogranite. It represents a rare alkalic to alkali-calcic suite, low-silica end members of which are thought to represent lowdegree partial melts of subduction-modified subcontinental lithospheric mantle (SCLM). Felsic end members are thought to reflect mixing between SCLM-derived magma and crustal melt. Archean Nd-model ages obtained from low-silica FLPS samples are interpreted as reflecting their mantle sources, not crustal contamination, and as such support the presence of Archean SCLM beneath this area at ca. 1885 Ma. The unusual and distinctive geochemical and isotopic characteristics of the FLPS make it a potential 'marker unit' for identifying the presence of Superior Province basement elsewhere in the Kisseynew Domain of Manitoba and Saskatchewan.