Neue Publikation in "Economic Geology"

Tschegg, C., A. H. N. Rice, B. Grasemann, E. Matiasek, P. Kobulej, M. Dzivák, and T. Berger (2019)
Petrogenesis of a Large-Scale Miocene Zeolite Tuff in the Eastern Slovak Republic: The Nižný Hrabovec Open-Pit Clinoptilolite Mine, Economic Geology, 114(6), 1177-1194.

Over 170,000 metric tonnes of high-grade clinoptilolite tuff were extracted from the open-pit mine in Nižný Hrabovec (eastern Slovak Republic) in 2018, making it one of the world’s major natural clinoptilolite producers.
The mine is hosted in a Miocene volcanogenic-sedimentary deposit in the East Slovak basin, with estimated 150 million tonnes of clinoptilolite tuff—the economically most important reserve in the European Union.

This work as part of the collaboration between the Department of Geodynamics and Sedimentology (University of Vienna) and Glock Health, Science and Research GmbH investigates the magma source, crustal contributions, deposition environment and postdepositional geochemical changes of this important clinoptilolite tuff deposits.

Titelseite von Economic Geology

Figure 1 of this paper has been selected as cover page of this issue of Economic Geology.

New Publication in "Tectonophysics"

Present-day kinematic behavior of active faults in the Eastern Alps

Baroň, I., Plan, L., Sokol, L., Grasemann, B., Melichar, R., Mitrovic, I., Stemberk, J., 2019. Present-day kinematic behaviour of active faults in the Eastern Alps. Tectonophysics 752, 1-23.  

We monitored fault systems in caves in the Eastern Alps over a 1.5–2.5-year observation period by means of high-resolution three-dimensional Moiré extensometers TM71.
The annual displacement rates of the monitored faults were mostly about an order of magnitude smaller than the rates of the entire crustal wedges revealed from GNSS.
The displacements could be attributed to various processes: Dilations and compressions were mostly associated with thermal-volumetric variations.
Normal dip-slips originated due to gravitational relaxation.
Displacements with the same kinematics as the geologically documented fault systems were attributed to tectonic creep and strain built-up during the inter-seismic period.
Opposing kinematics on these faults were usually recorded few days in advance to local earthquakes.
Therefore real-time of such displacements could be a step forward to an effective earthquake early warning.

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Poster "The upper part of the Eo-Alpine extrusion wedge: a tectono-metamorphic study from the tectonic window of Oberhof (Carinthia, Austria) (© S. Hollinetz)

Anna Rogowitz und Bernhard Grasemann

Der Otto Ampferer-Preis - Anna Rogowitz und Bernhard Grasemann (© B. Grasemann)