Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5057
EASTING   563586     NORTHING   6054835     ZONE   14     DATUM   NAD83
Date of mapping    06/24/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 79 59

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
light grey
dark grey
megacrystic
coarse grained

Field Description:

-coarse dark grey (light grey weathering) tonalite with plagioclase megacrysts up to 1 cm (average 6 mm) and 2 to 3 mm hornblende crystals
-extensively veined by late beige homogeneous equigranular granodiorite.
-slight trace of magnetite
-late anastomosing pink granite vein network

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
phenocryst plagioclase 5.0 10.0
mafic mineral hornblende 2.0 3.0 mm

Minerals of Note
Mineral Abundance (%)
biotite
magnetite -1.0


Manitoba Geological Survey, 2017