Definition of paragenesis in US English:



  • A set of minerals which were formed together, especially in a rock, or with a specified mineral.

    • ‘The distribution of mineral parageneses and illite crystallinity across one of the upright folds suggests that strain gradients favoured the metamorphic reaction progress from the hinge (low strain) towards the limbs (high strain).’
    • ‘Intrusive rocks were cored in neither well, although hydrothermal parageneses are extremely widespread and in-hole measurements at the bottom of the wells indicate a present-day temperature of 400 deg C.’
    • ‘In highly sheared rocks, relics of amphibolite-facies parageneses are lacking and the mylonite is made up of greenschist-facies mineral assemblages.’