Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5643
EASTING   569195     NORTHING   6048742     ZONE   14     DATUM   NAD83
Date of mapping    07/23/1984

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 271 67

Linear Structures
Type Plunge Azimuth
mineral lineation 56 69

PETROLOGIC DATA

Rock Number: 1

Rock Type: greywacke
Descriptors:
schistose
lithic

Field Description:

-same rock as previously called mafic greywacke but here texture better preserved and lithic fragments can be recog.
-these appear to be massivly bedded, there are numerous HB bearing feldspathic aggre. that may be remnant of felsic interbeds or an odd type of alteration assoc. of calc. silicate development

Minerals of Note
Mineral Abundance (%)
hornblende
biotite
tourmaline

Rock Number: 2

Rock Type: pegmatite
Descriptors:
granitic

Field Description:

-slightly podded, possibly folded mass of peristerite pegmatite
-generally constrained to the foliation, containing highly irregular contacts composed of persterite, tourmaline, perthitic microcline, blue green apatite, and quartz
-relativly quartz poor peg.
-dike varies from 17 m to less than 1 m
-it is foliated and locally sheared, textural variation is prominent, but the body is not coherently zoned


Manitoba Geological Survey, 2017