Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 86 STATION 6131
EASTING 557849 NORTHING 6024562 ZONE 14 DATUM NAD83
Date of mapping 06/14/1986

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 35 | 67 |

PETROLOGIC DATA

Rock Number: 1

Rock Type: gabbro
Descriptors:
massive
hornblende bearing
leucocratic
Field Description:

-leucogabbro
-sample taken
-most of island (around 80%) dark grey speckled with black mafic intrusive rock either leucogabbro/diorite
-plag. alters to GR-epidote indicating Ca-plag. comp inclusions of UM-hornblendite and fine grained black diorite (see rock #2)
-gabbro agmatized by buff peg-granite (see rock #3)
-variety of inclusion (probably cognate in gabbro of both fine and coarse grained mafic rock)

Rock Number: 2

Rock Type: diorite
Descriptors:
massive
mesocratic
Field Description:

-sample taken
-fine grained greenish black weakly-non-foliated homogeneous equigranular field rel. uncertain but appears to be included in gabbro as a single inclusion 1x2 m

Rock Number: 3

Rock Type: granite
Descriptors:
pegmatitic
leucocratic
Field Description:

-2 samples taken
-leucogranite modal white and biege quartz-rich granite
-grain size: 3 mm equigranular-->GRDR pegmatite
-contains minor MG BO only mafic

Manitoba Geological Survey, 2017