GACR

The proposed project will explore long-range vertically extensive magma transfer processes linking lower crustal source regions with volcanism at the Earth's surface. We will focus on Early Carboniferous late-Variscan post-orogenic magmatic complexes in the Bohemian Massif that are exposed at different crustal levels. Our multidisciplinary research approach will include field and structural mapping, analysis of anisotropy of magnetic susceptibility (AMS), high-precision radiometric dating using the CA-ID-TIMS, and whole-rock major trace element and Sr, Nd and Pb radiogenic isotope geochemistry. Moreover, we will employ analogue modelling combined with the AMS to simulate rather poorly constrained magma transfer process: diapiric upwelling, helical magma flow and ring dikes. Based on field studies and laboratory experimentation, we aim to develop a conceptual mechanical model of magma transfer through the Earth's crust. In addition, we plan to investigate the causes of spatial–temporal–compositional trends of post-orogenic magmas in the Variscan Bohemian Massif.      

The multidisciplinary project will address the issue of petrogenesis, emplacement

processes, and tectonic setting of Late Archean (ca. 2.9–2.6 Ga) granites in the Bienville subprovince,

NE Canada. In particular, the project will concentrate on analysis of fabric and

architecture of selected plutons, numerical modelling of associated crustal strains, determining

high-precision radiometric age using laser ablation ICP-MS and ID-TIMS and geochemical

composition including trace elements and Rb–Sr, Sm–Nd, and Hf isotopes. The obtained data

will be used to interpret thermal and mechanical conditions in the host rock during

emplacement, durations, tempos, and spatial and temporal patterns of plutonism. These

interpretations will then serve as a basis for a general discussion and testing the hypothesis

whether the Late Archean granites record plume-dominated vertical tectonics or whether they

record modern-style motions of lithospheric plates.

The project investigates the metamorphoses of urban constructions in the course of the 13th centruy, particularly the transition from non-masonry to masonry houses. Its main objective is the analysis of the results of archaeological and building-historical research from Brno, as well as from Prague, Wroclaw and Jihlava, in terms of chronology, typology, layout, ethnicity, etc. The project involves the comparative study and characteristics of the earliest burgher constructions in Central and eastern Europe before the 14th century. Emphasis is placed on an interdisciplinary approach regarding the technology of the buildings, guaranteed by the participation of ethnologists. Another target of the project is a major shift in the interpretation of the excavated contexts. A key part is the analysis of an extensive series of samples of fills and floors by means of the geoarchaeological method. The application of this method will elucidate, in particular, the function and length of use of some of the unearthed structures. The main outcome of the project is a collective monograph in English.

Black shale formations represent an outstanding and widespread oceanic sedimentary archive from the Archean to present. Their composition can potentially reflect different plate-tectonic settings at the time of their deposition. Additionally, black shales can also provide unique insights into the compositional variations in seawater chemistry and redox conditions of their depositional environment. Using a novel, multidisciplinary approach combining tectonic and structural analysis with geochronology, major/trace and Os–Nd–Cr–Mo–S isotope geochemistry, the proposed project will elucidate the influence of tectonic setting on the composition of black shale formations and explore their potential as stratigraphic markers in accretionary systems at convergent plate margins. Furthermore, the project will contribute to better understanding of processes causing variable oxygen levels throughout the Earth`s history, with a particular emphasis on the Neoproterozoic–Cambrian boundary associated with the Great Explosion of life on the Earth.

The Přídolí Series remains unique in the Phanerozoic as it is the only series recognized by the IUGS that has not been formally divided into stages. This state is being criticized for a long timeas it causes serious difficulties in global correlation of the upper Silurian. The GSSP of the Přídolí Series is in the Prague Synform, where it consists of carbonate facies rich in conodonts accompanied by moderately common graptolites. Therefore the main focus on possible subdivision of the Přídolí is based on integration of graptolite and refined conodont biozonation. The interpretation and timing of paleoenvironmental changes and bioevents across the Přídolí will be based on studies of six selected sections in the stratotype area and will include: 1. biotic data (changes in plankto-nekto-benthic faunas), 2. geochemical data (trace elements geochemistry and δ18O and δ13C isotope analyses), and 3. chemo–physical data (MS and GRS logs). A generalized correlation chart for the Přídolí Series in the Prague Synform with all available data will be a basis for prospective global subdivision. The aim of the project is integration of data on marine faunas and geochemical data from sections of the Prague Synform into a generalized correlation chart for the Přídolí Series in the stratotype area as a key document for the prospective chronostratigraphic subdivision of the Series.

The project combines geochemical, mycological, and molecular biology approaches and aims to provide better understanding of the factors and mechanisms affecting accumulation of Ag, Cu, Cd and Cd in macrofungi. To assess environmental factors in situ, the fractionation and mobility of metals in soil horizons will be analyzed at model sites. Colonization of soil horizons will be studied in Amanita strobiliformis. Pb isotopic composition of sporocarps will be used to trace the soil depth origin of accumulated metals. Distinct mycelial isolates of A. strobiliformis and Hebeloma mesophaeum will be subjected to phenotypic characterization, and subcellular metal species and expression of metal-related genes in mycelia will be investigated; gene-silencing and heterologous gene expression will be used to prove gene function or redirect the flow of intracellular metals. The accumulation of target metals and their intracellular forms will further be investigated in sporocarps of representative taxa, with special emphasis on Russula, Cystoderma a Phaeocollybia spp.

Weathering of sandstone is a widely studied topic by scientists from a number of geological, geomorphological and stone conservation disciplines. This research project is focused on a detailed study of the effect of gravity induced stress on the weathering of natural and artificial sandstone monuments. The fundamental concept – negative feedback between stress and erosion – has been published by us in 2014 in Nature Geoscience journal. A number of issues from this paper, however remain to be resolved. In this research project, elaborate 3D physical and numerical models of both sandstone landforms and man-made monuments (such as the monuments of the ancient town of Petra, Jordan) will be set up. A physically-based model for sandstone degradation will be developed, implemented in the finite element code and used in analyses of various natural and man-made sandstone forms. The effect of load on the erosion rate will be studied experimentally on various natural cemented sandstones. The effect of stress will also be studied on the evolution of open fracture porosity in sandstone aquifers.

The aim of the project is to assemble composite record of the evolution of continental environment in central Europe in period around the onset of Miocene Climatic Optimum from lacustrine sediments of the Most Basin in the Ohre (Eger) Rift. Drill cores 70-380 m long will be analysed from both central and marginal parts of the basin to limit specific influences of local source areas and tectonics. The work will be based on the use of magneto-, chemo- and cyclostratigraphy. Chemo- and cyclostratigraphy will be based on variation of sediment composition reflecting paleoenvironment in the lake watershed as well as lake hydrology; efficiency of proposed tools has already been successfully tested. The project will produce new record of the onset of the Miocene Climatic Optimum and allow its comparison with existing records, e.g. from the Paratethys area. It will contribute to understanding of the environmental changes with unprecedented temporal resolution of 1-2 thousand years.

Fish fauna of the Paratethys region has been described from different parts of Europe and western Asia. Moravia (Czech Republic; Central Paratethys) yielded rich material and ranks among the key areas. Four promising sites from two stratigraphic levels were selected for study within the proposed project. New data will allow to analyze and interpret relationships among fish assemblages from Oligocene to Lower Miocene. Principal aims of this project are: 1) description of fish assemblages at both stratigraphic levels on the basis of studied specimens, relationships among these assemblages, the nature of changes, and factors that could have induced such changes (especially paleoecological); 2) a detailed description of morphological changes within selected taxonomic groups in the studied time interval and explanation of their possible causes; 3) improvement of taxonomic interpretation of selected fossil fish groups on the basis of the studied specimens. The obtained results may outline general behavior of fish assemblages under specific conditions over time.

Forest ecosystems of the Czech Republic were exposed to a high level of pollutant deposition originating from coal burning in the 20th century. But studies investigating the fate of contaminants, such as toxic mercury, in the environment have been rather scarce. This project aims to explore the fate of mercury in forest ecosystems and its transformation to the highly toxic methylmercury in soils of two contrasting sites at the pristine Bohemian Forest and relatively polluted Beskids Mountains. We will fill a gap in the knowledge of historical deposition in northeastern Moravia through analysis of peat cores. Because the level of mercury deposition is an important parameter affecting the methylation processes, we will evaluate current mercury deposition at both sites and compare it to a reference site. Finally, forests at both contrasting study areas were subject to forest decline in the past decade due to insect infestations. Thus another aspect of this study will be to assessthe effect of forest dieback on methylation processes in polluted and unpolluted regions.