STRUCTURAL GEOLOGY
Lecture 31
Lineation & Foliation
(foliation)

Foliation - any mesoscopically penetrative parallel alignment of planar fabric elements in rock.

Primary foliations:  flow banding in rhyolite and axial planar cleavage in slump folds

Secondary foliations:  cleavages and mylonitic foliation

Metamorphic foliations:  slaty cleavage,  schistosity, gneissic structure

Mylonite foliations:  Protomylonite < 50% matrix
	Mylonite -  50% to 90% matrix
	Ultramylonite - > 90% matrix

Lineation - parallel alignment of elongate linear fabric elements in a rock body.

Mineral lineation

Stretched-Pebble conglomerate

Rodding

Mullion

Pencil Structure

Boudin

Tectonites:

S-tectonite

L- tectonite

LS - tectonite