What was the principal deformation mechanism in the quartz in the photomicrograph shown in Fig. G- 49 (Appendix G)? What was the principal deformation mechanism in the feldspar? Provide evidence to justify your answers. In what approximate range of temperatures did deformation in this rock occur? Comment on the degree of recovery or recrystallization in the quartz ribbons. Write your answer in wellcrafted, lucid, succinct sentences.

Fig. G- 49

Transcribed Image Text:

F F F F Fig. G-49 Photomicrograph for use in Problem 16.1.|F, feldspar; Q, quartz. Crossed polars. Scale bar is 0.5 mm.