Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5073
EASTING 571996
NORTHING 6041763
ZONE 14
DATUM NAD83
Date of mapping 06/26/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
schistosity | 89 | 75 |
PETROLOGIC DATA
Rock Number: 1
-Minor component of megacrystic granodiorite.
Unusual feature:
Because of less deformation and shearing here there are preserved blocky blue-grey an pink microcline megacrysts upto 20 cm floating in the tonalite. They are not dike or pegamtite related and don't appear to be structural features such as boudins. I can see no explanation for these other than magmatic megacrysts.
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
phenocryst | potassium feldspar | 0.0 | 20.0 | cm |
Mineral | Abundance (%) |
---|
biotite |
garnet |
Rock Number: 2
-many large rafts of highly folded mafic amphibolite.
-contains large deformed pods with hornblende-epidote rims and webwork of white quartz through a core of pale orange carbonate mineral - could be siderite - sample 2B carbonates for x-ray I.D.
Mineral | Abundance (%) |
---|
garnet |
Rock Number: 3
-Pegmatite and aplite dike swarms. Samples of aplite.
-Varicolored blocky microcline in grey quartz.
-Biotite only mafic.
-Garnet most abundant in quartz-poor margins.
Mineral | Abundance (%) |
---|
garnet |
biotite |
Manitoba Geological Survey, 2017