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