GEOSCAN Search Results: Fastlink


TitleGeology of the Mountain Grove pluton, Central Metasedimentary Belt, Grenville Province, Ontario
AuthorDavidson, A
SourceGeological Survey of Canada, Current Research (Online) no. 2000-C23, 2000, 7 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
AreaLong Lake; Leggat Lake; Mountain Grove
Lat/Long WENS-77.0000 -76.6667 44.7500 44.6667
Subjectsigneous and metamorphic petrology; structural geology; geochronology; bedrock geology; igneous rocks; plutonic rocks; lithology; schists; marbles; norites; leuconorites; gabbros; diorites; syenites; mineralization; sphalerite; field relations; mineral deposits; zircon dates; uranium lead dates; radiometric dates; structural interpretations; Central Metasedimentary Belt; Grenville Province; Mountain Grove pluton; Frontenac plutonic suite; Leggat Lake pluton; McLean pluton; Proterozoic
Illustrationssketch maps; photographs
Released2000 01 01
AbstractThe predominantly mafic Mountain Grove pluton, one of the youngest and most northwesterly members of the 1180-1150 Ma Frontenac plutonic suite, comprises two distinct intrusions. Both cut a previously folded succession of amphibolitic schist, siliceous schist, and marble. Coarse-grained norite and leuconorite characterize the northern unit, whereas hornblende gabbro and diorite with subordinate commingled monzonite and syenite characterize the southern, younger one. Commingled intrusions in the northern unit and its country rocks, and foliated biotite quartz syenite to the south, are probably both related to the southern unit. The northern unit likely formed from relatively uncontaminated magma, whereas the southern unit evolved from gabbro by magma mixing, incomplete where commingled. Copper-nickel-iron sulphide mineralization is associated with the northern unit, and sphalerite with marble enclaves in the southern unit. The Mountain Grove pluton is intruded by the Leggat Lake and McLean granite-syenite plutons to the east and southwest respectively.