Abstract
Quartz is among the most common minerals in the Earth’s crust and is stable within a wide range of temperature and pressure conditions. As its microstructure is sensitive to different deformation mechanisms, quartz may present information about the structural evolution of many different rock types. The Szentlőrinc-1 well with its drill cuttings brought to the surface from approximately 2 km depth provides an exclusive chance to investigate the shear zone beneath. The drill cutting collection includes only a few small rock grains, and more than 80 % of the material consists of tiny (<1 mm) single quartz grains. In this study, three microstructurally extreme quartz grain types were separated during microscopic analysis: grains with undulose extinction (U), grains with subgrains (S), and grains with recrystallized grains (R). Moreover, numerous microstructurally transitional grains were measured, which represent combinations of the above extremes. The characterisation of single quartz grain microstructures along the whole well enables identification and localisation of the ductile shear zones inside the crystalline complex. This information was combined with well-log data, which could provide information about the brittle deformation. Using these logs, brittle shear zones can be localised along the well. When comparing depths and extensions of the deformed horizons, a coincidence of the brittle and ductile zones becomes clear. This behaviour may suggest two different evolution schemes: it could be caused by primarily evolved softened regions, or it could be described by a detachment fault model.
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Acknowledgments
We thank Mannvit Ltd. and László Ádám for providing the samples and the Geo-Log Ltd. and the PannErgy Plc. for geophysical data. This research was supported by TÁMOP-4.2.2.A-11/1/KONV-2012-0047. English was corrected by American Journal Experts.
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Skultéti, Á., M. Tóth, T. Localisation of ductile and brittle shear zones along the Szentlőrinc-1 well in the Mecsekalja Zone using quartz microstructural and well-log data. Acta Geod Geophys 51, 295–314 (2016). https://doi.org/10.1007/s40328-015-0127-3
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DOI: https://doi.org/10.1007/s40328-015-0127-3