Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    85     STATION    6051
EASTING   565887     NORTHING   6049531     ZONE   14     DATUM   NAD83
Date of mapping    06/15/1985

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
bedding 249 60

Planar Structures:
Structure type Strike Dip Separation
schistosity 249 60

Dikes and Sills:
Rock Number Type Width (m) Strike Dip
0 pegmatite 0.00 301 40

Linear Structures
Type Plunge Azimuth
boudin axis 45 41

PETROLOGIC DATA

Rock Number: 1

Rock Type: sandstone
Descriptors:
layered
quartz-muscovite

Field Description:

-beige and grey weathering sandstones with 45 - 50 % quartz
-MV occurs as small segregations and lens in the foliation
-BD ranges from 15 to 40 cm and is an alteration of MV rich and MV poor layers
-both types show fine internal lamination
-flattening is extreme but is parallel to bedding
-there is around 5 to 10 % injected granitic lee, commonly baudinaged
-metamorphic grade is probably middle amphibolite
-definitly not a migmatite

Rock Number: 2

Rock Type: pegmatite

Field Description:

-2.5 m discordant dike of coarse unzoned 2 feldspar MV-tourmaline-GR PGMT
-large blocky microclines show coarse graphic textures
-massive quartz segregations irregularly shaped and randomly distributed
-tourmalines poikilitic or have a quartz rod in the core
-no dicernable zonation and coarse blocky microclines occur right up to the margins
-weak penetrative fabric that parallel's foliation in the sediment


Manitoba Geological Survey, 2017