Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5531
EASTING 568909 NORTHING 6053538 ZONE 14 DATUM NAD83
Date of mapping 07/03/1984

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 243 | 68 |

PETROLOGIC DATA

Rock Number: 1

Rock Type: gneiss
Descriptors:
MLNT
Field Description:

-shore line along this section is 65% intrusive and 35% GRCK
-lots of pelite and semi-pelite with subordinate psammite
-highly garnetiferous
-shearing is so intense that granite, pegmatite and GRDR lit are largely homogenized into seds. resulting in a mylonitic schlieric gneiss
-pelite is preferentially invaded
-numerous rusty gossans

Minerals of Note
Mineral | Abundance (%)
garnet

Rock Number: 2

Rock Type: granite
Descriptors:
porphyritic
muscovite microcline
Field Description:

-LARGE SAMPLE FOR ANALYSIS
-microcline porphyritic 2 mica granite as dikes parallel to foliation upto 1.5 m thick and down to cm size lit
-large dikes sheared but not as much as seds.
-small veins are augened
-possible candidate for young batholith source
-analysis may tell

Rock Number: 3

Rock Type: gabbro
Descriptors:
schistose
hornblende bearing
Field Description:

-old gabbro dike parallel to cataclasis
-it is extensivly sheared, recrystallized and altered
-around 5 m exposed as south side of narrow swampy break in outcrop
-could be as much as 25 or 30 m max.

Rock Number: 4

Rock Type: granodiorite
Descriptors:
massive
biotite
Field Description:

-grey homo-equi fine grained GRDR similar to youngest unit in CWB complex
-<1% of dikes are this material

Manitoba Geological Survey, 2017