Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 84
STATION 5582
EASTING 579769
NORTHING 6060766
ZONE 14
DATUM NAD83
Date of mapping 07/12/1984
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
cataclastic foliation | 66 | 89 |
PETROLOGIC DATA
Rock Number: 1
-this is one bitch of an outcrop!
-everything I've seen in the last two days is in this one exposure
-the whole exposure is cataclastic to locally mylonitic
-basically there are 3 rock types
(1) assorted mafic volcanics
(2) assorted gabbros
(3) assorted dacite porphyries
-they appear to be fault slices stacked together like a deck of cards
-basic distribution is gabbro to SE, basalt to NW and dacite down the middle
-the dacite is exposed in several layers from 1 to 10 m thick and appears to be dominantly fragmental quartz porphyry
-the basalt was probably a mixture of pillowed, massive and breccia layers but is just a streaky amphibole now
-the gabbro is much the same as previous stations but most is reduced to mafic augen gneiss (see sample 3)
Manitoba Geological Survey, 2017