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

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 283 | 77 |

-Tim's 142 or 143

PETROLOGIC DATA

Rock Number: 1

Rock Type: basalt
Field Description:

-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

Minerals of Note
Mineral | Abundance (%)
holmquistite

Manitoba Geological Survey, 2017