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Protomylonite

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A mylonite where less than 50% of the rock volume has undergone grain size reduction.

i. A mylonitic rock produced from contact-metamorphosed rock, with granulation and flowage being due to overthrusts following the contact surfaces between intrusion and country rock.

Ref: AGI

ii. A coherent crush breccia whose characteristically lenticular, megascopic particles faintly retain primary structures. It is a lower grade in the development of mylonite and ultramylonite.

Compare with: ultramylonite


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Classification of ProtomyloniteHide

References for ProtomyloniteHide

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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press

Internet Links for ProtomyloniteHide

 
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