Cross Lake Project (1983-86)

STRUCTURAL DATA

Planar Structures:

Structure type	Strike	Dip	Separation
schistosity	275	84

-it appears the 2 granodiorite types which are distinctly different on this outcrop may have been responsable for confusion in that highly tectonized outcrops have not allowed differentiation.
-suggest a cross check of previous samples for colour index and intensity of fabric

PETROLOGIC DATA

Rock Number: 1

-relativly undeformed zone with little intrusion of pegmatitic matierial
-age relation to younger intrusives fairly obvious in that rock types 2 and 3 both truncate pegmatite/tonalite layering of S1 age.

Textural Features

Type	Mineral	Min. Size	Max. Size	Abundance (%)	Unit
groundmass grainsize		0.0	1.0		mm
mafic mineral		0.0	0.0	4.0	%

Rock Number: 2

-age relations indicate intermediate age between types 1 and 3
-exhibits distinct intrusive relations into tonalite, but has its own distinct S2/S3 fabric, not found in rock type 3.
-the amount of injected matierial (mainly 1 to 3 cm granitic aplite and peg.) is much greater than rock type 3

Textural Features

Type	Mineral	Min. Size	Max. Size	Abundance (%)	Unit
mafic mineral		0.0	0.0	8.0	%

Rock Number: 3

-relativly featureless massive grey sandy textured rock
-appears to be youngest of granitic intrusion.
-it is highly deformed and intruded by late pegmatites but largely lacks the early granitic lit and strong S2 fabric

Textural Features

Type	Mineral	Min. Size	Max. Size	Abundance (%)	Unit
mafic mineral	biotite	0.0	0.0	15.0	%
groundmass grainsize	biotite	0.0	0.4		mm

Rock Number: 4

-plagioclase rich schlieric pegmatite, biotite strung out in S3 foliation
-feldspars partially granulated with some augen developement

Minerals of Note

Mineral	Abundance (%)
biotite
garnet
magnetite