Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5015
EASTING 568224 NORTHING 6044484 ZONE 14 DATUM NAD83
Date of mapping 06/19/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
gneissosity | 79 | 50 |
fault | 45 | 80 | dextral

-several aplitic sills in foliation along with usual compliment of pegmatitic stringers

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
augened
leucocratic
Field Description:

-older tonalite is 95% of exposure
-good 1 cm potassium feldspar augen up to 3% of exposure
-texturally indicative of cataclasis of lit-par-lit gneiss

Textural Features
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit
augen | potassium feldspar | 0.0 | 0.0 | 3.0 |

Rock Number: 2

Rock Type: granodiorite
Descriptors:
massive
biotite - amphibole bearing
boudin or boudinaged
Field Description:

-several isolated boudins of younger grey non-porphyritic GRDR
-very little injected lit matierial

Textural Features
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit
mafic mineral |  | 0.0 | 0.0 | 17.0 | mm

PHOTOS

Grey augen tonalite with old pegmatite cut by dextral offset shear filled with late pegmatite.

Outcrop view showing augen tonalite with 3 generations of pegmatite lit/dikes.

Manitoba Geological Survey, 2017