Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5508
EASTING   576790     NORTHING   6043327     ZONE   14     DATUM   NAD83
Date of mapping    06/29/1984

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 334 31

-see photo 5006--all the reefs and islands around the ultramafics are cataclastic pegmatites or pegmatitic leucogranite
-now is just K-feldspar augen gneiss
-BO only mafic

PETROLOGIC DATA

Rock Number: 1

Rock Type: gabbro

Field Description:

-island surrounded by peg. composed of layers of anothos. gabbro, gabbro, leucogabbro, and gabbroic anorthosite
-appears that island is one large raft
-the shore opposite has all been WJ augens and diorite, extensivly intruded by peg.
-there are numerous rafts along water line striking 330 degrees and dipping around 40 degrees resulting in steep, rubbly shoreline
-the intruded material is a mixture of volcanic and mafic intrusives
-at this location the basic rocks are completely recrystallized, moderatly sheared, but in general some units such as leopard gabbro are recognizable
-magnetite is present throughout most of the rock types, but isn't significantly high


Manitoba Geological Survey, 2017