Rock strain fringes,light micrograph

Numéro d’image : 11555595
Rock strain fringes,light micrograph
Rock strain fringes. Polarised light micrograph of strain fringes in a rock,also called pressure fringes. These are a type of microstructure formed by intense shear forces in deep-seated rocks. This example shows several pyrite crystals (opaque,black) in a phyllite host rock. The pyrite grains rolled over but remained rigid while the surrounding rock was deformed. Quartz,formed in the wake of the rotating grain,has been stretched out into a fibrous and curved shape. This image has been obtained using cross-polarised light (or 'crossed nichols'),which helps make the strain fringes visible
Licence : Droits gérés
Crédit: Science Photo Library / Wiersma, Dirk
Taille de l’image : 4957 px × 3770 px
Model Release : Non requis
Property Release : Non requis
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