@article{98,
  keywords = {Crystallographic preferred orientation, Main Central Thrust, Mylonite, Second phase, Strain localisation, Strain partitioning, Zanskar shear zone},
  author = {Nicholas Hunter and Pavl{\'\i}na Hasalov{\'a} and Roberto Weinberg and Christopher Wilson},
  title = {Fabric controls on strain accommodation in naturally deformed mylonites: The influence of interconnected micaceous layers},
  abstract = {Abstract We present microstructural analyses demonstrating how the geometrical distribution and interconnectivity of mica influences quartz crystallographic preferred orientation (CPO) development in naturally deformed rocks. We use a polymineralic (Qtz + Pl + Kfs + Bt + Ms {\textpm} Grt {\textpm} Tur) mylonite from the Zanskar Shear Zone, a section of the South Tibetan Detachment (NW Himalaya), to demonstrate how quartz \CPO\ intensity decreases from quartz-dominated domains to micaceous domains, independently of whether or not quartz grains are pinned by mica grains. We then use a bimineralic (Qtz + Ms) mylonite from the Main Central Thrust (NW Himalaya) to show how increasing mica grain connectivity is concomitant with a systematic weakening of quartz CPO. Our results draw distinctions between \CPO\ weakening due to: (i) second phase drag, leading to ineffective recovery in quartz; and (ii) increased transmission and localisation of strain between interconnected mica grains. In the latter case, well-connected micaceous layers take up most of the strain, weakening the rock and preventing straining of the stronger quartz matrix. Our findings suggest that rock weakening in quartz-rich crustal rocks is influenced not only by the presence of mica-rich layers but also the degree of mica grain connectivity, which allows for more effective strain localization through the entire rock mass.},
  year = {2016},
  booktitle = {Journal of Structural Geology},
  journal = {Journal of Structural Geology},
  series = {Journal of Structural Geology},
  volume = {83},
  pages = {180-193},
  issn = {0191-8141},
  url = {http://www.sciencedirect.com/science/article/pii/S0191814115300614},
  doi = {http://dx.doi.org/10.1016/j.jsg.2015.12.005},
}