Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 86 STATION 6173
EASTING 574352 NORTHING 6044551 ZONE 14 DATUM NAD83
Date of mapping 06/20/1986

STRUCTURAL DATA

PETROLOGIC DATA

Rock Number: 1

Rock Type: gabbro-norite
Descriptors:
gabbroic
norite
Field Description:

-gabbro norite approaching norite some erratic comp. layering appears to have 3 forms of mafics
1) black HB, equant-euhedral up to 4mm probably Di
2) black HB with rusty hematitic cores and equant tub to barrel shaped possibly alteredl OL.
3) 3 to 4 cm circular aggregates of greenish grey fibrous trem. probably okiocrystic En.
-plag. is interstitial and included in OPX
-rock is unfoliated but shows some slight shearing on 050 fractures
-discontinuous layer variation is marked by sharp tranisitions separating divergent mafic contens and grain size texture
-probably represents thermal gravitational convection boundaries
-this dike is poorly exposed but texture and outcrop position would suggest a dike between 30 and 40 m wide
-outcrop dike would fall into the High-MG population

Manitoba Geological Survey, 2017