Cross Lake Project (1983-86)

Geologist    P.G. Lenton     Year    83     STATION    5000
EASTING   571781     NORTHING   6046740     ZONE   14     DATUM   NAD83
Date of mapping    06/17/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 208 87

Minor Folds
Type Symmetry Strike Dip Plunge Azimuth
similar fold Z 41 76 55 61

minor fold has strong associated axial planar schistosity

PETROLOGIC DATA

Rock Number: 1

Rock Type: wacke
Descriptors:
layered
hornblende-plagioclase bearing
finely laminated
calc-silicate mineral/concretion

Field Description:

-Trace magnetite.
-Probable volcanic wacke/siltstone.
-Finely laminated with calcsilicate lenses. Possible thin mafic tuff horizons.

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
groundmass grainsize 0.0 0.1 mm
mafic mineral 0.0 0.0 25.0 mm
bedding thickness 1.0 5.0 m

Minerals of Note
Mineral Abundance (%)
diopside
magnetite

Rock Number: 2

Rock Type: pegmatite
Descriptors:
granitic

Field Description:

Boudinage:
-Block boudins of beige pegmatite.
-Minor marginl shearing.
-Primitive zoning with 3-10cm potassium feldspar in core
-Almost no free quartz

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
raft size in metres 20.0 120.0 m

Minerals of Note
Mineral Abundance (%)
potassium feldspar
biotite
tourmaline

Manitoba Geological Survey, 2017