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Petrological and chemical characterization of high-purity quartz deposits

Petrological and chemical characterization of high-purity quartz deposits with examples from Norway. Axel Müller, Jan Egil Wanvik, Peter M. Ihlen Geological Survey of Norway (NGU). Concentrations of lattice-bound trace elements in quartz. Müller et al. (2012).

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Petrological and chemical characterization of high-purity quartz deposits

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  1. Petrological and chemicalcharacterizationof high-purityquartzdeposits withexamples from Norway Axel Müller, Jan Egil Wanvik, Peter M. Ihlen Geological Survey ofNorway (NGU)

  2. Concentrations of lattice-bound trace elements in quartz Müller et al. (2012)

  3. (Micro-)petrological and chemical quartz deposit characterisation methods applied at NGU:

  4. (3) Laser ablation inductively coupled mass spectrometry

  5. (3) LA-ICP-MS

  6. Norwegian high-purity quartz deposits - example (1) The Nesodden hydrothermal quartz vein

  7. Norwegian high-purity quartz deposits - example (1)

  8. Norwegian high-purity quartz deposits - example (1)

  9. Norwegian high-purity quartz deposits – example (2) Kyanite quartzites

  10. Norwegian high-purity quartz deposits – example (2)

  11. Norwegian high-purity quartz deposits - example (2)

  12. Norwegian high-purity quartz deposits - example (3)

  13. Norwegian high-purity quartz deposits - example (3)

  14. Norwegian high-purity quartz deposits - example (2)

  15. Summary The processes of high purity quartz (HPQ) formation are different for the investigated deposits and, thus, there is no general rule for HPQ formation. The processes revealed in this study include: (a) HPQ crystallization of massive vein quartz from hydrothermal fluids mobilized in regional shear zones at greenschist-facies conditions (Nesodden). (b) HPQ crystallisation of quartz from granitic pegmatite melts (NedreØyvollen). (c) Recrystallisation of quartz-rich rocks at amphibolite-facies conditions <530°C (kyanitequartzites). (d) Secondary quartz refinement at micro-scale related to post-crystallization shearing and fluid-driven overprint under greenschist- to low-amphibolite-facies conditions (kyanite quartzites, Nesodden). The list of HPQ-forming processes provided is surely not complete and further studies are required.

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