Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5405
EASTING   575838     NORTHING   6060479     ZONE   14     DATUM   NAD83
Date of mapping    06/13/1984

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
cataclastic foliation 239 81
fault 47 84

-isoclinal folded quartz veins transect the foliation in a N/S direction and post date the mylonites

PETROLOGIC DATA

Rock Number: 1

Rock Type: sandstone
Descriptors:
schistose
lithic

Field Description:

-same lithic wacke with rare pebbly beds
-shearing completly obliterated all sense of bedding direction
-sillimanite is heavily alltered to muscovite
-numerous pseudotachylites, often spaced cm apart
-faults are feathered and arcuate, quartz conten has decrease to 35%
-lithics are indistinguishable from matrix
-quartz veins invasive into foliation plane contain abundant hornblende and chlorite, probably by iron leaching of the sands

Minerals of Note
Mineral Abundance (%)
muscovite
sillimanite


Manitoba Geological Survey, 2017