Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5072
EASTING 572247 NORTHING 6041776 ZONE 14 DATUM NAD83
Date of mapping 06/26/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 67 | 55 |

-1 photo augen (see below)
-1 photo of point to SE showing large size of volcanic amphibolite rafts running full lengths of point

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
cataclastic
augened
schlieric or schlieren present
leucocratic
pegmatite lit
amphibolite inclusions present
Field Description:

-old schlieric tonalite intruded by numerous potassic quartz rich pegmatites and a few beige aplites
-excellent developement of augen structures
-0ne particular augen of microcline from a pegmatite is rhombic with granular quartz filled pressure shadows (see photo)

Minerals of Note
Mineral | Abundance (%)
garnet

PHOTOS

Quartz-microcline augen formed by boudinage and shearingg of granitic pegmatite veins. Young shear refracts along the right side of the augen.

View of the shoreline to show the size of the amphibolite rafts in the leucotonalite

Manitoba Geological Survey, 2017