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

Planar Structures:
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

Rock Type: granodiorite
Descriptors:
augened
biotite

Field Description:

-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

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral 0.0 0.0 12.0 %


Manitoba Geological Survey, 2017