Low-Grade Mylonites

  • Rudolph A. J. TrouwEmail author
  • Cees W. Passchier
  • Dirk J. Wiersma


The temperature range for these mylonites is thought to be roughly between 250 and 500 °C. There is a gradual transition between cataclasites and low-grade mylonites. Whereas many feldspar porphyroclasts in low-grade mylonites still show fracturing by cataclasis, the quartz is usually deformed by crystal-plastic processes as shown by its change in shape and by undulose extinction. At increasing temperature bulging recrystallisation starts to manifest itself along the lobate contacts and eventually recrystallisation by subgrain rotation takes over (Chapter 10).


Shear Band Mylonitic Foliation Undulose Extinction Subgrain Rotation Shear Sense Indicator 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Rudolph A. J. Trouw
    • 1
    Email author
  • Cees W. Passchier
    • 2
  • Dirk J. Wiersma
    • 3
  1. 1.Depto. Geologia Ilha do FundaoUniversidade Federal do Rio de JaneiroRio de Janeiro-RJBrazil
  2. 2.Institut für GeowissenschaftenUniversität MainzMainzGermany
  3. 3.UtrechtThe Netherlands

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