Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 86 STATION 6488
EASTING 561282 NORTHING 6044866 ZONE 14 DATUM NAD83
Date of mapping 07/27/1986

STRUCTURAL DATA

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
megacrystic
biotite
Field Description:

-quartz =25%, as previous station

Minerals of Note
Mineral | Abundance (%)
epidote

Rock Number: 2

Rock Type: gabbro
Descriptors:
massive
mesocratic
Field Description:

-black and white salt and pepper gabbro homo. equi.
-extensivly intruded by pegmatite which also occupies the contact with the GRDR
-appears to have undergone high degree of recrystalization

Rock Number: 3

Rock Type: amphibolite
Descriptors:
layered
hornblende - diopside bearing
Field Description:

-alternating HB-rich DI-EP-Rich layers
-layering is on a cm scale
-the layering maybe strictly tectonic and it is impossible to saywhether the rock is mafic sed. or a sheared volcanic
-both gabbro and ampb are largely included in the pegmatite

Rock Number: 4

Rock Type: granite
Descriptors:
pegmatitic
leucocratic
Field Description:

-ultracoarse-pegmatitic granite
-BO is the only mafic well-foliated locally sheared
-occupies most of the point with large inclusions of amphibolite
-appears to be a simple low differeniate type probably of the minago series, no zoning

Manitoba Geological Survey, 2017