Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5086
EASTING 568042
NORTHING 6044110
ZONE 14
DATUM NAD83
Date of mapping 07/04/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
gneissosity | 81 | 65 |
PETROLOGIC DATA
Rock Number: 1
- Outcrop is 70% younger granodiorite, intruded by numerous intrafolial quartz poor potassic pegmatites.
-moderate injection of highly sheared aplitic matierial.
-in general the extent of lit injection is much greater than typical for the granodiorite
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
groundmass grainsize | 0.0 | 3.0 | mm | ||
mafic mineral | biotite | 0.0 | 0.0 | 12.0 | % |
Rock Number: 2
-extremly deformed highly compressive tonalite, biotite schlieren common
-boudinage and augen structures of pegmatitic lit dominate the foliation plane
-folding both ptygmatic and z-assymetric
Rock Number: 3
-origin uncertain, extensivley intruded by pegmatite
- vague suggestions of layering, may have a sedimentary component.
-probably part of the greenstone environment but far too deformed and recrystallized to be certain.
-forms low flat rubbly outcrops parallel to shoreline
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
mafic mineral | 0.0 | 0.0 | 40.0 | % |
Manitoba Geological Survey, 2017