Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5099
EASTING 573555
NORTHING 6040306
ZONE 14
DATUM NAD83
Date of mapping 07/07/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
gneissosity | 72 | 79 | |
fault | 298 | 77 |
Fault is a 20 cm brecciated mylonite
PETROLOGIC DATA
Rock Number: 1
-Base rock is augen-granodiorite, highly schlieric
-early pegmatite injection is near totally homogenized by shearing
-schistosity is highly erratic, but gneissosity is planar
-biotite shows moderate segregation
Mineral | Abundance (%) |
---|
hornblende |
Rock Number: 2
-highly varied inclusions of obvious volcanic source appear to be dominantly flow derived with a minor source from volcanic sediments
-highly brecciated and deformed
-much of the schlieric matierial is hornblendic and probably derived from the amphibolites
PHOTOS
General texture of the augen grandiorite showing the intense fabric.
Mylonite cutting the old granodiorite with brecciated and rotated fragments in the ultramylonite.
Layered amphibolite reduced to agmatite then schollen screens in the old augen grandiorite
Manitoba Geological Survey, 2017