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