Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5147
EASTING 572454
NORTHING 6049085
ZONE 14
DATUM NAD83
Date of mapping 07/17/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
schistosity | 283 | 77 |
-Tim's 142 or 143
PETROLOGIC DATA
Rock Number: 1
-altered basalt
-alteration veinlets of chlorite-tourmaline-talc-hornblende in the infill in the pressure shadow of quartz permeated with acicular tourmaline and fibrous radial aggregates of silver blue amphibole that may be holmquistite
-the interesting factor is that if this tourmaline-holmquistite alteration is associated with the spodumerne dikes then it indicates the dikes intruded S4 during deformation - ie. - tourmaline-holmquistite is in the extension necks of S4 boudins
Samples
1. from quartz pod - orange mineral I thought as garnet but is probably feldspars
2. From float sample of pegmatite pod that looks very near to source - opaque for x-ray
3. large sample of alteration veins
4. samples of tourmaline-holmquistite for x-ray +/- chemistry
Mineral | Abundance (%) |
---|
holmquistite |
Manitoba Geological Survey, 2017