Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6348
EASTING   570906     NORTHING   6049990     ZONE   14     DATUM   NAD83
Date of mapping    07/12/1986

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
bedding 116 78 N

Planar Structures:
Structure type Strike Dip Separation
schistosity 116 78

Linear Structures
Type Plunge Azimuth
boudin axis 83 55

-SAMPLE
1A QZ psammite
1B feldspathic GRCK
1C calc-silicate

PETROLOGIC DATA

Rock Number: 1

Rock Type: greywacke

Field Description:

-light grey weathering, psammitic greywacke
-bedding is 5 to 15 cm commonly graded with rare thin cross beds or ripples (too deformed to tell morphology)
-numerous 5 to 40 cm calc. silicate layers comprising of massive EP cores surrounded by green fibrous ampb and fine plag.
-several beds have an unusual grey blastic feldspar with BP inclusions
-feldspars are rectangular and occur only in MV-bearing beds.
-in several locations these blasts segregate into small masses of leucosome
-the grade does not appear high enough to be amobilisitate, so probably related to fluid flushing from pegmatitic injections

Minerals of Note
Mineral Abundance (%)
muscovite

Rock Number: 2

Rock Type: pegmatite

Field Description:

-50% of exposure is massive dikes of coarse pegs
-there is considerable comp and text. variation, with some dikes having coarse masses of BO and traces of Gr, while others have podiform aggregates of quartz, microcline, MV and schorl?? with minor red GR
-MC are non-graphic


Manitoba Geological Survey, 2017