Journal cover Journal topic
Solid Earth An interactive open-access journal of the European Geosciences Union

Journal metrics

  • IF value: 3.495 IF 3.495
  • IF 5-year<br/> value: 3.386 IF 5-year
    3.386
  • CiteScore<br/> value: 3.70 CiteScore
    3.70
  • SNIP value: 0.783 SNIP 0.783
  • SJR value: 1.039 SJR 1.039
  • IPP value: 1.987 IPP 1.987
  • h5-index value: 20 h5-index 20
https://doi.org/10.5194/se-2017-44
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
19 May 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Solid Earth (SE) and is expected to appear here in due course.
Texture analysis of experimentally deformed Black Hills Quartzite
Rüdiger Kilian1 and Renée Heilbronner1,2 1Department of Environmental Sciences, University Basel, Basel, Switzerland
2Department of Geology, University of Tromso, Tromso, Norway
Abstract. The textures of three samples of Black Hills quartzite (BHQ) deformed experimentally in the dislocation creep regime 1, 2 and 3 (according to Hirth and Tullis, 1992) have been analysed by EBSD. All samples were deformed to relatively high strain, within a temperature range of 65° and identical displacement rates and are almost entirely composed of dynamically recrystallized grains.

A texture transition from peripheral c-axes in regime 1 to a central c-axis maximum in regime 3 is observed. Separate pole figures are calculated for different grain sizes, aspect ratios and long axis trend (θ) of grains, and high and low levels of intragranular deformation intensity as measured by the grain kernel average misorientation (gKAM). Misorientation relations are analysed for different texture components (named Y- B- R- and σ, with reference to previously published prism, basal, rhomb and σ1 – grains).

Results show that regime 1 and 3 correspond to clear end member textures with regime 2 being transitional. Texture strength and the development of a central c-axis maximum from a girdle distribution depends on deformation intensity at the grain scale and on the contribution of dislocation creep which increases towards regime 3. Combined with calculations of resolved shear stresses and misorientation analysis, it becomes clear that the peripheral c-axis maximum in regime 1 is not due to deformation by basal –<a> slip. We interpret the texture transition as a result of different texture forming processes, one being more efficient at high stresses (formation of grains with peripheral c-axes), the other depending on strain (dislocation glide involving prism and rhomb slip systems), and not as a result of a temperature dependent activity of different slip systems.


Citation: Kilian, R. and Heilbronner, R.: Texture analysis of experimentally deformed Black Hills Quartzite, Solid Earth Discuss., https://doi.org/10.5194/se-2017-44, in review, 2017.
Rüdiger Kilian and Renée Heilbronner
Rüdiger Kilian and Renée Heilbronner
Rüdiger Kilian and Renée Heilbronner

Viewed

Total article views: 552 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
433 111 8 552 1 7

Views and downloads (calculated since 19 May 2017)

Cumulative views and downloads (calculated since 19 May 2017)

Viewed (geographical distribution)

Total article views: 552 (including HTML, PDF, and XML)

Thereof 543 with geography defined and 9 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 16 Oct 2017
Publications Copernicus
Download
Short summary
Quartz crystallographic preferred orientations (textures) are widely used to interpret conditions, kinematics or deformation mechanisms in deformed rocks. Textures of experimentally deformed quartzite were analysed and we find that the finite texture is the result of two different texture forming processes which depend on stress and strain but not directly on temperature. The findings help in the interpretation of deformation conditions from textures in naturally deformed rocks.
Quartz crystallographic preferred orientations (textures) are widely used to interpret...
Share