Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5013
EASTING   567388     NORTHING   6044041     ZONE   14     DATUM   NAD83
Date of mapping    06/18/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
gneissosity 52 51

-2 m dike of crudely zoned pegmatite
-biotite only mica
-rough quartz core with large 30 cm blocky microcline surrounded by quartz-microcline pegmatite,
-garnet occurs as small pockets of 1 to 3 mm euhedral blood red crystals
-abundant large magnetite masses (up to 1 x 2 cm)

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
gneissic
leucocratic
augened

Field Description:

-augen gneiss much as previously
-most pegmatitic matierial restricted to foliation plane

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral 0.0 0.0 5.0 mm

Minerals of Note
Mineral Abundance (%)
biotite
magnetite

Rock Number: 2

Rock Type: granodiorite
Descriptors:
massive
biotite

Field Description:

-schlieric rafts and agmatized bodies of younger grey slightly porphyritic granodiorite

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral biotite 0.0 0.0 15.0 mm
phenocryst plagioclase 0.0 0.0


Manitoba Geological Survey, 2017