Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5588
EASTING   580005     NORTHING   6062534     ZONE   14     DATUM   NAD83
Date of mapping    07/13/1984

STRUCTURAL DATA

-the whole outcrop is folded in a tight antiform with the axis trending approximately 050 degrees
-plunge near 80 degrees

PETROLOGIC DATA

Rock Number: 1

Rock Type: TUFF
Descriptors:
laminated
felsic

Field Description:

-finely laminated on mm scale rhyolite in composition
-local silification of the FLSC beds
-layers average 1 to 1.5 m and are interbedded with MAFC GRCK

Minerals of Note
Mineral Abundance (%)
garnet

Rock Number: 2

Rock Type: greywacke
Descriptors:
laminated
mafic

Field Description:

-dark greenish black weathering CL rich LAMN silty GRCK

Minerals of Note
Mineral Abundance (%)
garnet

Rock Number: 3

Rock Type: schist
Descriptors:
massive
calc-silicate mineral/concretion

Field Description:

-3 m exposed of rusty green heavily gossaned CL schist
-local silification
-alteration has obliterated all primary featrues but it is probable that it was derived from the tuffs and wackes


Manitoba Geological Survey, 2017