7		Experimentally deformed pyroxenite and diabase
	TOP	1-	Experimentally deformed quartz aggregates	2-	Naturally deformed quartz-rich rocks
		3-	Experimentally deformed feldspar aggregates	4-	Naturally deformed feldspar rocks
		5-	Experimentally deformed quartzo-feldspathic rocks	6-	Naturally deformed quartzo-feldspathic rocks
		7-	Experimentally deformed pyroxenite and diabase	8-	Deformation and metamorphic reactions in polyphase rocks
	Experimentally deformed pyroxenite and diabase		examples
			Introduction In rocks of the granitic continental crust, mica and quartz are the weaker phases and feldspars are the stronger phase, but in rocks of the gabbroic oceanic crust, the feldspars are generally the weaker phase and pyroxenes are the stronger phase. The deformation microstructures developed in deformed pyroxenites have not been as thoroughly studied experimentally as those in quartz and feldspar (and olivine), but this mineral appears to undergo a similar sequence of dislocation creep regimes. In this chapter we include images of two different experimentally deformed samples, which seem to show microstructures characteristic of regime 1 and regime 2 dislocation creep. In addition, we include an image of a fine-grained gabbro (diabase) experimentally deformed to high strain, which shows pyroxene 'augen' and highly flattened plagioclase feldspar grains, similar to microstructures observed in some natural mylonites.
			further reading