Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5040
EASTING   570825     NORTHING   6041801     ZONE   14     DATUM   NAD83
Date of mapping    06/23/1983

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
bedding 346 50

Planar Structures:
Structure type Strike Dip Separation
schistosity 346 50

PETROLOGIC DATA

Rock Number: 1

Rock Type: amphibolite
Descriptors:
layered
finely laminated
mafic
agmatized
salt and pepper texture
gabbroic

Field Description:

-finely laminated mafic gneiss with abundant boudinaged injection sills
-very large rafts up to 100 m or more in granitic rock
-much of amphibolite is well layered sedimentary amphibolite with
mafic and leucocratic layers that are continuous for extensive distances on outcrop.
-other layers are more massive salt & pepper amphibolite that may have been extrusive

Rock Number: 2

Rock Type: two component schlieric gneiss - intimate mixture of 2 major units
Descriptors:
leucocratic

Field Description:

-mainly old tonalite with wisps of biotite and rare vague inclusions of granodiorite

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


Manitoba Geological Survey, 2017