Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6228
EASTING   560672     NORTHING   6034025     ZONE   14     DATUM   NAD83
Date of mapping    06/25/1986

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
cataclastic foliation 34 43

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
schlieric or schlieren present
biotite

Field Description:

-same leucocratic mod. foliated intrusive with dark smokey quartz
-occurs on south side of island

Rock Number: 2

Rock Type: granite
Descriptors:
pegmatitic
leucocratic

Field Description:

-central and north part of island
-highly sheared and some places mylonitic and compress coarse red granite and peg.
-abundance of grey mafic TNLT inclusions
-pegmatitic GRNT contains disseminated red garnet and layered garnet aplite
-zone relations unknown
-outcrop is chopped up in shear fabric
-mafic TNLT inclusions are unidentifiable (supracrustal or intrusive)
-few identifiable gabbro-diorite inclusions
-schlieren are numerous particularly between aplite layers
-many inclusions are reduced to ghost schlieren
-this leuco GRNT maybe derived or associated with the leucoGRDR of previous station
-probably part of Minago Group or similar chemistry

Minerals of Note
Mineral Abundance (%)
garnet
tourmaline
magnetite


Manitoba Geological Survey, 2017