Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    85     STATION    6019
EASTING   574864     NORTHING   6043859     ZONE   14     DATUM   NAD83
Date of mapping    06/10/1985

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 50 58

Dikes and Sills:
Rock Number Type Width (m) Strike Dip
0 vein 0.00 154 77

-heavy alteration-potassic- granite goes to pink MC+QZ+MV

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
porphyritic

Field Description:

-rock change-grey seriate or bimodal porphyry
-large 1 to 2 cm MC phenos and 3 to 4 mm phenos of plagioclase?(+/-MC)
-looks like (somewhat) grey porphyry but has no visable FL
-grain size down to 0.5 mm
-quartz down to 30 %, BO up 1 % and phenocrysts are larger
-where sheared in augen GRNT
-schlieren and nebulite appearing
-sample B in of potassic alteration veins


Manitoba Geological Survey, 2017