Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5032
EASTING   569525     NORTHING   6041999     ZONE   14     DATUM   NAD83
Date of mapping    06/22/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
gneissosity 348 59

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
augened
leucocratic
layered
augened
boudinaged

Field Description:

-well layered gneiss with moderate development of microcline augen up to 2 cm that must represent remnants of megacrysts from pegmatitic lit.
-boudinage common

Rock Number: 2

Rock Type: granodiorite
Descriptors:
charcoal grey
massive
20% of the exposure
young phase / unit

Field Description:

-sample of injected lit of GRDR around
- 20 % of exposure is younger charcoal coloured massive intrusive unit
-not porphyritic at this locality

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral biotite 0.0 0.0 15.0 mm
groundmass grainsize 0.0 0.6 cm

Minerals of Note
Mineral Abundance (%)
biotite


Manitoba Geological Survey, 2017