Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5042
EASTING 571202 NORTHING 6041591 ZONE 14 DATUM NAD83
Date of mapping 06/23/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
gneissosity | 11 | 76 |

Dikes and Sills:
Rock Number | Type | Width (m) | Strike | Dip
2 | diabase | 2.20 | 283 | 78

-inclusion of layered amphibolite

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
porphyritic
leucocratic
gneissic
Field Description:

-same as before except megacrysts are slightly more obvious
-strange 0.2 x 3.0 m lenticular pods of pegmatite: quartz core surrounded by microcline-plagioclase
-Garnets (upto 8mm) in margins and as halo around pods for several cm's. Looks like an in situ miarolitic type of development, not a dike
-Sample on tape for Xray ID of waxey grey-green mineral in pod
May be altered feldspar
Xray ID: xenotime

Textural Features
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit
phenocryst | plagioclase | 0.0 | 0.0 |  |

Minerals of Note
Mineral | Abundance (%)
garnet

Rock Number: 2

Rock Type: diabase
Descriptors:
Molson dike
chill margin present
2.2 metres wide
Field Description:

-chill margins and coarser core that has large pyroxenes and probable magnetite-serpentine pseudomorphs of olivine

Minerals of Note
Mineral | Abundance (%)
pyroxene
olivine
serpentine

Manitoba Geological Survey, 2017