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TitleField evidence for commingling between ca. 1830 Ma lamprophyric, monzonitic, and monzogranitic magmas, MacQuoid-Gibson lakes area, Nunavut
AuthorSandeman, H A; Lepage, L D; Ryan, J J; Tella, S
SourceGeological Survey of Canada, Current Research (Online) no. 2000-C5, 2000, 10 pages,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (2000). Current Research 2000, Geological Survey of Canada, Current Research (Online) no. 2000-ABCDE
File formatpdf
NTS55M/09; 55M/16; 55N/11; 55N/12; 55N/13; 55N/14
AreaMacQuoid Lake; Gibson Lake; Squiggly Lake; Bowser Island; Strivewell Island; Round Island; Cross Bay
Lat/Long WENS-94.5000 -93.0000 64.0000 63.5000
Subjectsstratigraphy; igneous and metamorphic petrology; Archean; bedrock geology; volcanic rocks; igneous rocks; stratigraphic correlations; field relations; magmas; petrogenesis; mineral assemblages; igneous rocks; plutonic rocks; granodiorites; quartz monzonites; monzo-granites; gabbros; diorites; Churchill Province; commingling; Proterozoic; Precambrian
Illustrationssketch maps; photographs
ProgramWestern Churchill NATMAP Project
Released2000 01 01
AbstractAlthough it has been recognized that ca. 1830 Ma, mantle-derived ultrapotassic and mildly alkaline, granitic crustal melts are broadly coeval in the northwest Hearne domain of the western Churchill Province, details of their petrogenetic relationships remain enigmatic. Field observations from a number of localities demonstrate that a range of magmatic compositions coexisted at that time ranging from spessartite lamprophyre and/or phlogopite clinopyroxenite through hornblende+phlogopite gabbro, diorite, and quartz monzonite to biotite granodiorite and biotite+magnetite±fluorite monzogranite. Mutual crosscutting relationships between many of the rock types, typified by irregularly shaped intrusive bodies having diffuse contacts and, scalloped enclaves of lamprophyre and monzonite in monzogranite imply diverse magma commingling, and that the potassic, mantle-derived melts possibly initiated the widespread, ca. 1830 Ma granite bloom in the region.