Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6394
EASTING   563695     NORTHING   6047576     ZONE   14     DATUM   NAD83
Date of mapping    07/19/1986

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 39 38

PETROLOGIC DATA

Rock Number: 1

Rock Type: gneiss
Descriptors:
layered
garnet-biotite bearing

Field Description:

-very unusual rock, comprising of interlayered psammitic textured GR-BO gneiss and white garnet - quartz- plagioclase gneiss
-no indication of original rock although exposure is very poor
-SC is very pronounced with a platy cleavage
-locally red GR represents 20 to 25% of the rock
-it appears that this has gone thru extensive alkali stripping
-BO GNSS also contains trace of fibrous amphibole (this should be checked in TS to see if there is an anthophyllite assemble)
-in general, in appearance the rock has a higher meta. grade than anticipated for this area, probably upper amphibolite


Manitoba Geological Survey, 2017