Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5575
EASTING   577931     NORTHING   6059864     ZONE   14     DATUM   NAD83
Date of mapping    07/11/1984

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 44 75

PETROLOGIC DATA

Rock Number: 1

Rock Type: feldspar - quartz porphyry
Descriptors:
schistose
DCIT

Field Description:

-unusual texture to the rock
-generally it's the normal qpp but the central area of outcrop has an intricate alteration network associated containing it
-the veining seems to be hornblende bearing
-in general the rock has an inhomo character containing erratic distribution of phenocrysts
-the alteration does not look to be strictly a tectonic point
-this maybe a dacite breccia
-this location is all dacite but the island 100 feet away has dacite in contact contains mafic rocks
-this hamybe a pneumatolitic breccia or possibly a crackle breccia on a dome
-there is extensive carbonate veining


Manitoba Geological Survey, 2017