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