Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 84
STATION 5665
EASTING 568481
NORTHING 6049054
ZONE 14
DATUM NAD83
Date of mapping 07/26/1984
STRUCTURAL DATA
Layering type | Strike | Dip | top Direction |
---|---|---|---|
bedding | 311 | 54 |
Structure type | Strike | Dip | Separation |
---|---|---|---|
schistosity | 251 | 76 |
Type | Plunge | Azimuth |
---|---|---|
rodding | 53 | 43 |
PETROLOGIC DATA
Rock Number: 1
-hornblende rich seds. as to east with some ampb. horizons
-patchy feldspathic alteration
Mineral | Abundance (%) |
---|
hornblende |
garnet |
Rock Number: 2
-brownish grey weathering psammite to west of outcrop
-mostly 1 to 2 in massive lush with 10 to 20 cm semi-pelite interbeds
-patchy alteration to feld-HB on 2 to 5 cm scale
Rock Number: 3
-sampled extensivly by Anderson
-part of peristerite group
-not as much plag. as at 5643 dike but still significant
-has BO, some TC, lots of apple green apatite
-a few tiny opaques
-two textural phases--1) coarse plag. rich phaneritic
2) true peg, blacky perthitic microcline in peg-often graphic
Rock Number: 4
-ALTERATION ZONE
-patchy material as at last with orange - pink garnet and some TL appears constrained to layering-may predate pegs
-appears to be aluminous alteration as amount of free quartz decreases sharply in the alteration patches
Mineral | Abundance (%) |
---|
garnet |
tourmaline |
Rock Number: 5
-grey white 2 m thick massive intrusion
-intrusive into layering and folded by late foliation
-TL developed along contact with country rock
-pinches out to thin vein and then disappears going east
-relationship to pegs unclear as they don't cross but as it is intruding layering only and is then folded
-I suspect it predates pegs. significantly
Mineral | Abundance (%) |
---|
biotite |
tourmaline |
Manitoba Geological Survey, 2017