Microstructures

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Deformation of Allanite

Click image to enlarge

68. Rotation of allanite clasts - This allanite in protomylonitic granodiorite near Borrego Springs, southern California, has broken into several fragments which have subsequently rotated during deformation. A single stable crack (does not extend beyond grain boundaries) is visible in the large grain at center.

FOV 1.5 mm, Plane Light.

69. Stable cracks in allanite - This single allanite grain in mylonitic granodiorite near Borrego Springs, looks quite undeformed, apart from a number of stable cracks. However, the lower right part of the grain is a little darker than the rest of it, indicating that the lattice has been riddled with microcracks.

FOV 1.5 mm, Plane Light.

Deformation of Allanite	Click image to enlarge
68. Rotation of allanite clasts - This allanite in protomylonitic granodiorite near Borrego Springs, southern California, has broken into several fragments which have subsequently rotated during deformation. A single stable crack (does not extend beyond grain boundaries) is visible in the large grain at center. FOV 1.5 mm, Plane Light.
69. Stable cracks in allanite - This single allanite grain in mylonitic granodiorite near Borrego Springs, looks quite undeformed, apart from a number of stable cracks. However, the lower right part of the grain is a little darker than the rest of it, indicating that the lattice has been riddled with microcracks. FOV 1.5 mm, Plane Light.