Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5078
EASTING   572140     NORTHING   6039140     ZONE   14     DATUM   NAD83
Date of mapping    06/27/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
cataclastic foliation 228 80

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
schlieric or schlieren present
leucocratic
augened
cataclastic

Field Description:

-augen cataclastic gneiss - has both tonalite and granodiorite intensely mixed.

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral biotite 0.0 0.0 7.0 mm
groundmass grainsize 0.0 1.0 mm

Rock Number: 2

Rock Type: gabbro
Descriptors:
massive
occurs as a raft

Field Description:

-2 m x 4 m raft of massive mafic rock - gabbro or quartz diorite -can't be sure of quartz content but may be 5 to 10 %

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral hornblende 0.0 0.0 35.0 %
groundmass grainsize 0.5 1.0 mm
raft size in metres 2.0 4.0 m

Minerals of Note
Mineral Abundance (%)
quartz 7.0
hornblende
biotite


Manitoba Geological Survey, 2017