Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6512
EASTING   570869     NORTHING   6042650     ZONE   14     DATUM   NAD83
Date of mapping    08/01/1986

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 279 57
schistosity 49 69

Dikes and Sills:
Rock Number Type Width (m) Strike Dip
0 Molson dike 0.15 254 73

-strong fracture set, tightly spaced in the Molson, slightly chloritized or epidotized at 157/80
-this appears to be a cooling feature, not tectonic

PETROLOGIC DATA

Rock Number: 1

Rock Type: multi-component schlieric gneiss

Field Description:

-complex mixture of early intrusive phases caught up in camp GRDR; the dominant old phase is the old augen-TNLT that is heavily intruded by young grey PORT-GRDR
-this is extensively intruded by PGMT's
-there appears to be some yung, MASS, grey GRDR with some contradictory age relations indicating PORT younger than MASS.
-the 270 degree fabric is dominant for foliation and layering
-slightly folded by 050 degrees with some penetrative cleavable fabric

Rock Number: 2

Rock Type: diabase

Field Description:

-Greenish black weathering, highly jointed
-Molson of the non-MG variety
-2 - 2 m appart dark dikes, no detectable magnetism
-the second dike show very weak magnetism in the core


Manitoba Geological Survey, 2017