Figure 58

Experimentally deformed quartzo-feldspathic rocks

Figure caption

Experimentally deformed quartzo- feldspathic rocks

starting material & regime1 / regime 2 / annealing & melting

58

EA shortened 60% at 900°C, 10-6/sec, and 1200 MPa; quartz becoming more interconnected, feldspars less so.

EA shortened 60% at 900°C, 10-6/sec, 1200 MPa. This photo shows a sample deformed at the same conditions as photo #57 but to higher strain. Here one can see better evidence for feldspar grains having been separated by boudinage into several smaller lozenge-shaped grains. Also, the continued homogeneous flattening of quartz grains has allowed them to become more interconnected (e.g. in SE quadrant of photo; also compare with the original grain size in photo 55). Thus with increasing strain at these conditions the feldspars tend to become less interconnected and the quartz tends to become more interconnected: the sample undergoes strain weakening as the bulk rock rheology switches from being more 'controlled' by the feldspars to being more 'controlled' by the quartz. (W304)

		Experimentally deformed quartzo-feldspathic rocks
		Figure caption

	Experimentally deformed quartzo- feldspathic rocks	starting material & regime1 / regime 2 / annealing & melting


58		EA shortened 60% at 900°C, 10-6/sec, and 1200 MPa; quartz becoming more interconnected, feldspars less so. EA shortened 60% at 900°C, 10-6/sec, 1200 MPa. This photo shows a sample deformed at the same conditions as photo #57 but to higher strain. Here one can see better evidence for feldspar grains having been separated by boudinage into several smaller lozenge-shaped grains. Also, the continued homogeneous flattening of quartz grains has allowed them to become more interconnected (e.g. in SE quadrant of photo; also compare with the original grain size in photo 55). Thus with increasing strain at these conditions the feldspars tend to become less interconnected and the quartz tends to become more interconnected: the sample undergoes strain weakening as the bulk rock rheology switches from being more 'controlled' by the feldspars to being more 'controlled' by the quartz. (W304)