Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5210
EASTING   572779     NORTHING   6049088     ZONE   14     DATUM   NAD83
Date of mapping    08/18/1983

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
bedding 96 56

Planar Structures:
Structure type Strike Dip Separation
schistosity 98 77

-see rock 1 for station 5210 for complete structural data

PETROLOGIC DATA

Rock Number: 1

Rock Type: pegmatite

Field Description:

DIKE A11
-Two parallel dikes, max 2.4 m width. Strikes 096/56. Muscovite, quartz, beryl clevelandite, spodumene, microcline secondary muscovite, tourmaline, garnet. Rather massive unzoned appearance, Spodumene mainly concentrated in central regions. Blocky microcline erratic in distribution. Most of dike is replacement alblite mainly in clevelandite form. Spodumene is <1%. Secondary muscovite may be a result of alteration of spodumene during albitization. Beryls are snow white anhedral, averaging .5 to 1 cm. The dike has undergone moderate shearing although the quartz shows post-deformational annealing. Microcline is mottled white grey and orange. Oxides are not obvious. The second dike on the east side is separated by less that a metre of amphibolite. It appears identical and in all probability is the same dike folded around

SCHISTIOCITY ----> 098/77


Manitoba Geological Survey, 2017