Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5103
EASTING 574207
NORTHING 6041059
ZONE 14
DATUM NAD83
Date of mapping 07/08/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
gneissosity | 79 | 65 | |
schistosity | 0 | 0 |
-biotite cross-fabric striking 152 degrees dips steep
-cross fabric seems associated with fracture cleavage
-intense isoclinal folding is prominent all along this shore with a very shallow plunging axes
PETROLOGIC DATA
Rock Number: 1
-quartz shows moderate segregation into foliation plane
-feldspars show distinct rolling
-biotite appears to be the only mafic as small lensoid segregations
-contains numerous inclusions, dominantly of hornblendite which is probably altered pyroxenite of unit 5
-also contains numerous schlierien and whispy inclusions of volcanic amphibolite
- potassic quartz rich pegmatite lying in the foliation plane is extensivly sheared resulting in 1 to 5 cm feldspar augen in a quartz-sericite matrix with minor biotite
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
mafic mineral | 0.0 | 0.0 | 12.0 | % |
Manitoba Geological Survey, 2017