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