Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5052
EASTING 571834
NORTHING 6040050
ZONE 14
DATUM NAD83
Date of mapping 06/23/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
cataclastic foliation | 41 | 61 | |
gneissosity | 41 | 61 |
minor mylonite seams in the foliation plane
PETROLOGIC DATA
Rock Number: 1
- equal amounts of tonalite and various late grey granodiorite phases.
-These include a fine to medium grained grey granodiorite that shows good intrusive realtionship into the tonalite gneiss; the normal porphyritic granodiorite and a coarsely porphyritic granodiorite.
-minor mylonite seams are common in the foliation plane
Rock Number: 2
-young intrusive with sharp imtrusive contacts into old tonalite and including or dyking into the other granodiorite units
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
mafic mineral | biotite | 0.0 | 0.0 | mm |
Rock Number: 3
older of the 2 dominant late granodiorite to tonalite intrusives
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
phenocryst | plagioclase | 2.0 | 5.0 | 10.0 | mm |
mafic mineral | biotite | 0.0 | 0.0 |
Rock Number: 4
not a common phase - appears to be approximately the same age as rock 3, may be related.
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
phenocryst | plagioclase | 0.0 | 20.0 | mm | |
mafic mineral | biotite | 0.0 | 0.0 |
Manitoba Geological Survey, 2017