STRUCTURAL GEOLOGY
Lecture 30
Cleavage
(continuous and spaced)

Nature of Cleavage
	Geometric relationship of cleavage to folding
	Geometric relationship of cleavage to shearing
	Domainal character of cleaved rocks
		cleavage domains
		microlithon domains
Types of Cleavage
	Continuous cleavage
		slaty - fine grained rocks
		phyllitic - soft, pearly, satiny luster
		schistosity - medium grained rocks
	Disjunctive cleavage
		Crenulation cleavage
		Spaced Cleavage
Microscopic properties of cleavage
	Slaty Cleavage
		Mica-rich domains
		Quartz-feldspar domains
	Schistosity
	Crenulation Cleavage
	Spaced Cleavage
Strain Significance of Cleavage
	Expression of Shortening
	Alignment of Mica without grain rotation
	Estimates of Volume Loss
	Crenulation Cleavage vs. Shortening
	Classification of Spaced Cleavage
Passive Folding
	Characteristics of Passive Folding
	Transposition