Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6140
EASTING   566260     NORTHING   6054360     ZONE   14     DATUM   NAD83
Date of mapping    06/16/1986

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
metamorphic layering 56 77

Planar Structures:
Structure type Strike Dip Separation
schistosity 56 77

PETROLOGIC DATA

Rock Number: 1

Rock Type: sandstone
Descriptors:
gneissic
garnet-sillimanite bearing

Field Description:

-30 to 35% quartz
-rock has much of textural appearance of MXAK
-layering is totally disrupted with the outcrop being 20% granitic lit
-MV has been almost completly altered to SM
-red GR is a common assessory
-in general the rock doesn't look proper for a migmatite
-this may be a combination of thermal metasomatic effects from the core granite
-it seems unlikely this rock has reached anatexsis unless we are west of another major boundary
-several irregular unzoned biotite-rich microcline-oligoclase pegmatites
-they are marginal peraluminous, MV poor
-these may represent either the eastern end of the Manago or more likely the western most primitive Nelson series pegmatites

NOTED: -3 mm horizon composed of 50% BO and 50% red garnet-doesn't go anywhere and may be a clast


Manitoba Geological Survey, 2017