Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5062
EASTING   570198     NORTHING   6037887     ZONE   14     DATUM   NAD83
Date of mapping    06/25/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
cataclastic foliation 71 73
fault 71 73

Minor Folds
Type Symmetry Strike Dip Plunge Azimuth
similar fold Z 68 66 7 57

Fault is 5 cm ultramylonite
Fold 10 cm amplitude isoclinal (inter-limb angle 30°)

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
grey - white
dark grey
cataclastic
medium grained

Field Description:

-Cataclastic zone with main rock of medium grained grey white hornblende rich intrusive
-unlike any granodiorite/tonalite encountered so far
-Contains inclusions(?) of finer grained grey to dark grey matierial that may have been sedimentary and/or volcanic
-quartz 20%
- hornblende 15%
- magnetite trace to 1%
-65% feldspar
-epidote occurs along fracture and in mylonites

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral hornblende 0.0 0.0 15.0 %
mineral abundance quartz 0.0 0.0 20.0 %
mineral abundance feldspar 0.0 0.0 65.0 %

Minerals of Note
Mineral Abundance (%)
epidote
magnetite 1.0


Manitoba Geological Survey, 2017