Institute of Geology

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2019-06-11
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2019-06-11
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2019-06-11
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2019-05-16
18:17
15th International Ichnofabric Workshop : program, abstracts, Field Guidebook
Kočová Veselská, Martina ; Adamovič, Jiří ; Kernhoff, M. ; Rifl, M. ; Šamánek, J. ; Mikuláš, Radek
Radek Mikuláš convened the 15th International Ichnofabric Workshop to Prague (April 27th – May 5th, 2019). Thirty-two specialists from over the world presented recent contributions from the mainstream branch of ichnology, e.g., ichnofabrics of terrestrial systems. Special discussion block was devoted to the use of computed tomography in the study of Ichnofabric. Three days (five days for participants of the post-workshop excursion) for the workshop were devoted to field excursions. Thereby, most of the localities known only through publications have been seen and evaluated directly to the world top ichnologists.
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2019-05-16
18:17

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2019-05-16
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2018-07-09
13:44

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2018-05-28
15:54

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2018-03-09
13:19
New data on the origin of the Fe-Cu-As skarn deposit at Obří důl, West Sudetes, Bohemian Massif
Pašava, J. ; Veselovský, F. ; Dobeš, P. ; Erban, V. ; Pour, O. ; Žák, Karel ; Ackerman, Lukáš ; Haluzová, Eva ; Creaser, R. ; Tásler, R.
The Obří důl Fe-Cu-As sulfide deposit is hosted in metamorphosed lenses of marble, calc-silicate rocks and skarns. The deposit is located up to a few hundred meters away from the contact of the large, late-orogenic Variscan Krkonoše-Jizera Plutonic Complex (KJPC). Mineralogical and fluid inclusion studies of the Gustavská ore lens show that the main sulfide stage, dominated by pyrrhotite, chalcopyrite and arsenopyrite, originated from water-rich hydrothermal fluids with salinities up to 8 wt.% NaCl eq. at temperatures ranging from 324 to 358°C.These fluids replaced mainly the carbonate-rich lithologies. The 34S values indicate a magmatic source of sulfur and Re/Os dating of molybdenite are consistent with simultaneous formation of the main sulfide stage ore and the KJPC.

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2017-09-18
15:25

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