Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6209
EASTING   570224     NORTHING   6047363     ZONE   14     DATUM   NAD83
Date of mapping    06/23/1986

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
bedding 289 73

Planar Structures:
Structure type Strike Dip Separation
schistosity 289 73

Linear Structures
Type Plunge Azimuth
boudin axis 0 0

-pitch is 85 degrees to the east in Fl
-some layers show a granitic lit that appears to be an injection but also has some of the characteristics of mobilisate

PETROLOGIC DATA

Rock Number: 1

Rock Type: basalt
Descriptors:
cataclastic
pillowed

Field Description:

-greenish black chloritic highly deformed basalt
-very dense possibly verging on ultramafic
-exposure has a layered look of greenish-black hornblende rich and greenish-grey epidote rich material
-could be either a pillowed unit or a breccia
-all that remains is a layered cataclastic gneiss
-this structurally overlies the sedimentary rocks
-there are several rusty gossen zones a few cm wide and non-continuous

Minerals of Note
Mineral Abundance (%)
garnet
chlorite

Rock Number: 2

Rock Type: sandstone
Descriptors:
bedded
feldspathic

Field Description:

-grey laminated feldspar rich sandstone-siltstone-mudstone sequence
-strongly deformed but retaining continuity of layering
-feldspathic sandstone layers are beige to light grey, rich in feldspar and pink garnet
-this is interbedded and possibly graded with grey fine grained more siliceous siltstone and thin black garnetiferous muds
-there are some layers up to 10 cm thick of black garnetiferous mafic siltstone or mudstone (see sample B)

Minerals of Note
Mineral Abundance (%)
garnet


Manitoba Geological Survey, 2017