Figure 38

Experimentally deformed feldspar aggregates

Figure caption

Experimentally deformed feldspar aggregates

Starting material / cataclastic flow / regime 1

38

TA shortened 35% at 900°C, 10-6/sec, and 1200 MPa; narrow zones of very fine recrystallized grains (regime 1 dislocation creep) allow localized dextral shear.

Higher magnification view of a portion of the shear zone region in the sample shown in photo #37. The recrystallized grains within the thin dextral shear zones are only ~1 µm in diameter; because they are so small, grain boundary migration can frequently sweep through them and remove any accumulated dislocations. The faster recovery in the fine grained zones makes them weaker and causes strain to be strongly localized. (W694)

		Experimentally deformed feldspar aggregates
		Figure caption

	Experimentally deformed feldspar aggregates	Starting material / cataclastic flow / regime 1


38		TA shortened 35% at 900°C, 10-6/sec, and 1200 MPa; narrow zones of very fine recrystallized grains (regime 1 dislocation creep) allow localized dextral shear. Higher magnification view of a portion of the shear zone region in the sample shown in photo #37. The recrystallized grains within the thin dextral shear zones are only ~1 µm in diameter; because they are so small, grain boundary migration can frequently sweep through them and remove any accumulated dislocations. The faster recovery in the fine grained zones makes them weaker and causes strain to be strongly localized. (W694)