Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6126
EASTING   559199     NORTHING   6025710     ZONE   14     DATUM   NAD83
Date of mapping    06/14/1986

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 305 54
schistosity 49 67

Dikes and Sills:
Rock Number Type Width (m) Strike Dip
0 vein 0.00 46 87

-monomineralic blue grey quartz vein
-PHOTOS 1,2,3 --> pegmatite (general)

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
seriate porphyritic
biotite

Field Description:

-seriate GBBR
-slightly schlieric with inclusions of the old MCSG
-quartz conten 30%, decrease in megacryst content
-distribution of megacrysts is patchy with a range of 5 to 20%
-sample taken

Rock Number: 2

Rock Type: pegmatite
Descriptors:
pegmatitic

Field Description:

-pegmatite
-sample taken
-swarm of late pink peg. showing little penetrative fabric slightly anastomosing with a 235 trend and variable mod. dips contp-->distinctly perialuminous
-discontinous zonation is present but poorly developed quartz content low; aggregate content 15% with local development of central pods, microcline, pink with grey modelling
-muscovite>biotite
-garnet abundant as accessory as is euhedral and skeletal tourmaline
-dike margins--> medium grained-aplitic with garnet laminations and aug. 5 cm
-internal zones packed microcline and minor quartz biotite muscovite
-core zone is large euhedral MC+QZ+tourmaline-musc.
-mabe advanced minago series(?)


Manitoba Geological Survey, 2017