Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5025
EASTING 568376 NORTHING 6042736 ZONE 14 DATUM NAD83
Date of mapping 06/20/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 312 | 62 |
fault | 281 | 80 |

-photos of incredable mylonite and augen mylonite features
-mylonite layered

PETROLOGIC DATA

Rock Number: 1

Rock Type: gneiss
Descriptors:
augened
granodiorite
tonalitic
shears present or common
cataclastic
Field Description:

-heavily sheared - both tonalite and granodiorite present but so intimately associated because of heavy cataclasis that you can't really separate phases.
-There appears to be some warping and distortion of the mylonite by later penetrative shear

PHOTOS

Brecciation of old sheared multi-component gneiss by younger small scale cross-cutting mylonite/ultramylonite seams.

Detail of late crosscutting mylonite.(card resting on late surface)

Late granitic lit occupying dextral fractures.

Large augen formed in old leucotonalite by progressive boudinage and rotation of early granite/pegmatite veins.

Manitoba Geological Survey, 2017