Jakub Trubač

Charles University in Prague | CUNI · Institute of Geochemistry, Mineralogy and Mineral Resources

Black shales may serve as an important source of metals such as Co, Ni, or As, largely due to anoxic to euxinic conditions in association with high concentrations of sulfur leading to efficient scavenging and transport of metals from seawater to the seafloor sediment. We report on an unusual type of Au mineralization newly discovered in Ediacaran t...

The Miocene Climate Optimum was an interval of global climatic warmth characterised by significant global palaeoceanographic changes. In this paper, we describe the parastratotype section of the regional Karpatian stage (late Burdigalian) at Hevlín quarry in the Czech Republic, to improve knowledge of evolving palaeoenvironment and palaeoclimate du...

Mercury (Hg) concentrations in soils and Hg releases from soils during wildfires are not well characterised in Portugal, even though wildfire activity continues to increase around the Mediterranean. This study focused on the low to moderate severity wildfire in Pombal (Portugal) in 2019, which consumed 12.5 ha of maritime pine (Pinus pinaster Ait.)...

The use of calcareous nannofossils for provenance analysis is a new-old topic for cultural heritage. Several studies have already mentioned it for ceramic, but less for paintings. Preparatory layers of the paintings are often made with chalk, which is composed of microfossils. To extract a calcareous nannofossils assemblage from a painting layer, w...

In conjunction with major, trace and rare earth element data, this study presents the first whole-rock LuHf isotope analyses of mafic-ultramafic rocks of the c. 3.3 Ga Kromberg type-section in the Barberton greenstone belt of South Africa. Three compositionally distinct volcanic rock types are identified namely Group 1 metabasalts, Group 2 metabasa...

The capacity of several plant species or landraces to inhibit nitrification in soil (biological nitrification inhibition, BNI) has been assessed in certain tropical pastures. These assessments are commonly based on potential net nitrification rates, which do not differentiate between gross nitrification and other processes that may reduce the amoun...

Calcareous nannofossils for provenance analysis is a new-old topic for cultural heritage. Several studies already mentioned it for ceramic but less for paintings. Preparatory layers of the paintings are often made with chalk which is composed of microfossils. In order to extract the calcareous nannofossils assemblage from these layers, we need to d...

The Superior Province in Canada represents an excellent natural laboratory to test various models of crustal growth and evaluate tectonic regimes during late Archean. Here, we present new geochemical and geochrono-logical data for ca. 2.8-2.7 Ga plutons intruding different lithotectonic units of the northeastern part of the Superior Province that d...

In this study, we report combined Tl isotopic and Tl mineralogical and speciation data from a set of Tl-rich sulfide concentrates and technological wastes from hydrometallurgical Zn extraction. We also present the first evaluation of Tl isotopic ratios over a cycle of sulfide processing, from the ore flotation to pyro- and hydrometallurgical stages...

Ancient brass (aurichalcum) was a valued commodity in the Antiquity, notably because of its gold-like appearance. After mastering brass fabrication using the cementation procedure in the first century BC in the Mediterranean, this material became widely used by the Romans for coins, jewellery and other artefacts. Because of its visual qualities, it...

Central Europe in the Iron Age a highly dynamic space and time, with extended mobility, contact networks and circulation of artefacts. So far, little attention has been given to the archaeometry of metals in the Iron Age on account of supposedly biased data due to recycling and mixing of sources. However, we believe that a large-scale sampling of c...

Vertical profiles of Tl, Pb and Zn concentrations and Tl and Pb isotopic ratios in a contaminated peatland/fen (Wolbrom, Poland) were studied to address questions regarding (i) potential long-term immobility of Tl in a peat profile, and (ii) a possible link in Tl isotopic signatures between a Tl source and a peat sample. Both prerequisites are requ...

Ancient brass ( aurichalcum ) was a valued commodity in the Antiquity, notably because of its gold-like appearance. After mastering brass fabrication using the cementation procedure in the 1 st century BC in the Mediterranean, this material became widely used by the Romans for coins, jewellery and other objects. Because of its visual qualities, it...

Historical Pb-Zn mining and smelting in Kabwe in Zambia have made it one of the most polluted cities in the world. Four soil profiles were collected around the smelter and in remote locations, and two pine trees (Pinus montezumae L.) were sampled for tree ring cores. These were analyzed for Pb, Zn and Cu contents and Pb isotopic ratio. Furthermore,...

Supporting information includes a detailed well-log correlation of boreholes in the western depocenter of Bohemian Cretaceous Basin (Figures S1 – S6; uploaded separately), geochemistry and lithology of the reference borehole 4523-A (Figures S7 and S8), spectral estimates for a resistivity log of borehole J-719 670 (Fig. S9), results of the TimeOpt...

The Early Turonian interval represents a unique confluence of climatic and oceanographic conditions including peak surface temperatures, high greenhouse-gas concentrations and maximum Phanerozoic sea level. The susceptibility of this climate mode to astronomical insolation forcing remains poorly understood partly due to a limited time control and u...

Arctic cryoconite holes represent highly biologically active aquatic habitats on the glacier surface characterized by the dynamic nature of their formation and functioning. The most common cryoconite apex consumers are the cosmopolitan invertebrates – tardigrades and rotifers. Several studies have highlighted the potential relevance of tardigrades...

The paper presents a geochemical analysis of a remarkable assemblage from the early La Tène period (4th century BCE): the Duchcov hoard found in the late 19th century in north-western Bohemia. More than a thousand pieces of bronze jewellery (mostly brooches and bracelets) in a bronze cauldron were deposited in a natural spring. This possibly ritual...

In this study, two Czech wetland soils enriched in authigenic sulfide minerals (especially realgar) were collected from the saturated zone (60-100 cm), flooded with local groundwater and allowed to dry for up to 98 days. The objective was to examine the mobility of As, Fe, S and trace metals using selective chemical extractions, S isotopes and X-ra...

This study examines a lower Cambrian pyrite-bearing black shale–graywacke succession in the Czech Republic interpreted as infill of a deep-marine, extensional trench-slope basin on top of an accretionary wedge that developed during subduction of an oceanic plate beneath the northern margin of Gondwana. The new U–Pb detrital zircon geochronology of...

Bioenergy crops such as Miscanthus x giganteus are foreseeable as an alternative source to replace fossil fuel and reduce greenhouse gas emissions. They are also assessed as an environment-friendly solution for polluted, marginal and low-quality agricultural soils. Several studies had been launched on soil organic carbon sequestration potentials of...

The study presents nitrogen isotope data from prehistoric and Medieval charred cereal grains and grains from modern experiments in the Czech Republic and Slovakia. The results are consistent with δ¹⁵N values of cereals from other European countries. Various crops were manured differently, perhaps according to specific societal needs. Surprisingly,...

We present a new chironomid record from sediments of former Lake Švarcenberk in South Bohemia (412 m asl, Czech Republic), located in the oceanic-to-continental macroclimatic transitional zone of eastern Central Europe. We provide estimates of Weichselian Late Glacial and Early Holocene (ca. 15–8 ka BP) mean July air temperatures on the basis of ch...

The late Neoproterozoic Lečice black shales and an overlying siliciclastic succession, Bohemian Massif, were deposited in a marine environment on a volcanic arc and provide insights into palaeoenvironmental conditions at the former active margin of northern Gondwana. Field relationships integrated with major/trace element and Mo–Cr–S isotope system...

In transportation engineering, earthwork is the main structural material which geotechnical properties can be positively modified withadmixtures. This article focuses on the application of energy by-products in earthwork of transportation line structures and summarizes their advantages and define the scope of their utilization. Earthwork constructi...

Fluid anomalies were often considered as possible precursors before earthquakes. However, fluid properties at the surface can change for a variety of reasons, including environmental changes near the surface, the response of the superficial fluid system to loads associated with the mechanical nucleation of earthquake fractures, or as a result of tr...

Lu–Hf isotope system and Sr–Nd–Hf–Os isotope systematics of mantle rocks is capable to unravel the early processes in collision belts, especially in hot subduction context where Sm–Nd, and U–Pb system in crustal rocks, are prone to resetting due to high temperatures and interaction with melts during exhumation. To improve models of the Devonian-Car...

Geochronologic data combined with a GIS-based spatial analysis of plutons in the Bohemian Massif, Variscan belt, allow to describe the apparent magma fluxes and episodic temporal pattern of plutonism, different from the cyclic pattern of continental-margin arcs. The former is interpreted as reflecting a secular thermotectonic evolution of the oroge...

This paper aims to discuss the origin and significance of the so-called spoked-wheel amulets from the late Iron Age (3rd to 1st century BC). The type with eight spokes, which most resembles a real chariot wheel, was discovered to be made of a specific alloy containing a large amount of lead and a significant amount of antimony, plus traces of silve...

We studied the key geochemical and mineralogical factors that could affect the fractionation of stable thallium (Tl) isotopes in soil. A set of grassland soil samples enriched in geogenic Tl in combination with selected Tl-containing mineral materials from the Czech Republic (Kluky) were investigated for this purpose. The results demonstrate signif...

The highlights of the 2nd TSMO season:  Collection of 22 charcoal samples from trilith heaths across Oman for radiocarbon dating of the last time of use (terminus ante quem).  Collection of 7 OSL samples beneath trilith platform stones in Duqm and Ẓufār for OSL dating when trilith monuments were built (terminus post quem).  New recording of tw...

This paper deals with an attempt to understand the meaning of a unique, small and isolated La Tène mountain site, discovered by chance in the forested part of the Šumava National Park, Šumava Mts., Czech Republic, using available archaeological and environmental methods. The activities of a person/small group of people took place repeatedly in an a...

Abstract. Cryoconite holes are ecosystems on the glacier surface characterized by dynamic nature and truncated food webs. It is acknowledged that cryoconite holes play an important role being biodiversity hot-spots and factories for organic matter on glaciers. The most common cryoconite apex consumers are the cosmopolitan invertebrates – tardigrade...

The post-tectonic Sedmihoří Stock (SCS) is a circular body in plan-view, made up of three nested units: (i) 'Outer granite' (OG), less fractionated Kfs-phyric Bt monzogranite (326.2 ± 1.2 Ma (2σ), LA ICP-MS Zrn), (ii) 'Inner granite' (IG), more evolved Bt-Ms monzogranite (326.6 ± 1.2 Ma), and (iii) innermost leucogranite ('LG'), fine-grained Tur-Ms...

Opportunities to study the anthropogenic cementation zones within permanently flooded mine works, where toxic elements accumulate by processes not fully described, are generally very rare. We examined macroscopic arsenic sulfide deposits inside a decomposed timbering of an abandoned mine adit, which had been flooded for 75 years. Bonazziite (β-As4S...

Microbial sulfidogenesis plays a potentially important role in As biogeochemistry within wetland soils, sediments, and aquifers. This study investigated the effects of microbial sulfidogenesis on As mineralogy in the As-enriched wetland soil found at the natural geochemical anomaly of the Smolotely-Líšnice (Czech Republic) historical gold district....

This poster focuses on C and Pb isotopic ratios measured in tree rings close to a smelter in Kabwe. This, coupled with soil profile and slag elemental and isotopic analysis allow for a great story to be told.

The Blovice accretionary complex, Bohemian Massif, hosts well-preserved basaltic blocks derived from an oceanic plate subducted beneath the northern active margin of Gondwana during late Neoproterozoic to early Cambrian. The major and trace element and Hf–Nd isotope systematics revealed two different suites, tholeiitic and alkaline, whose compositi...

Rationale Applications, where stable C and O isotope compositions are useful, require routine instrumental techniques with a fast sample throughput which should also produce accurate and precise results. We present a comparison of three different instrumental IRMS approaches (Dual Inlet ‐ DI; Elemental Analyzer ‐ EA; Continuous Flow ‐ CF) to determ...

The Cínovec/Zinnwald granite cupola represents the apical part of a post-collapse pluton emplaced into the Late Carboniferous Altenberg–Teplice caldera in the NW Bohemian Massif. The cupola is vertically zoned and dominated by alkali feldspar A-type granite of the Younger Intrusive Complex (YIC) of the Krušné hory/Erzgebirge batholith. The pluton h...

The dynamics of Cu and Pb were studied in eight soil profiles (Luvisols, Chernozems), located at various distances from the tailing dams near a closed Cu-Pb-(Zn)-Ag mine at Kombat (Namibia) by a combination of isotope and elemental studies, leaching techniques and speciation modelling. Tailings, soils and bedrocks were analyzed for the bulk Cu and...

We studied thallium (Tl) isotope fractionation in white mustard grown hydroponically at different Tl doses. Thallium isotope signatures in plants indicated preferential incorporation of the light ²⁰³ Tl isotope during Tl uptake from the nutrient solution. Negative isotope fractionation was even more pronounced in dependence on how much the availabl...

Collections of Cystoderma carcharias sporocarps were sampled from clean and smelter-polluted sites and analyzed for Ag, As, Cd, Cu, Pb, Se, and Zn contents. Concentrations of all elements were significantly higher in samples from the smelter-polluted area. Except for As and Pb, all elements were effectively accumulated in the sporocarps at both cle...

Thallium (Tl) concentration and isotope data have been recorded for contaminated soils and a set of industrial wastes that were produced within different stages of Zn ore mining and metallurgical processing of Zn-rich materials. Despite large differences in Tl levels of the waste materials (1-500 mg kg-1), generally small changes in e205Tl values h...

The Uitkomst Complex is a Ni-Cu-PGE-Cr-Co mineralized composite mafic-ultramafic intrusion situated in South Africa. The platinum-group elements (PGEs), Re and Au contents in base metal sulfides (BMS), and Re-Os isotope compositions were determined, as well as the occurrence of associated platinum-group minerals (PGMs) in the various mineralized zo...

The copper (Cu) content and isotopic composition were studied in soils and in pine tree rings at locations close to and far from the Cu smelter, located at Kitwe, Zambia. The soil in the remote area contained 25-75mgkg-1 Cu, whereas the soil close to the smelter contained 207-44,000mgkg-1 Cu. The δ65Cu at the remote area and close to the smelter va...

Thallium (Tl) concentration and isotope data have been recorded for contaminated soils and a set of industrial wastes that were produced within different stages of Zn ore mining and metallurgical processing of Zn-rich materials. Despite large differences in Tl levels of the waste materials (1–500 mg kg−1), generally small changes in ε205Tl values h...

This study integrates gravimetry and thermal modelling with petrology, U–Th–Pb monazite and zircon geochronology and whole-rock geochemistry of the early Carboniferous Říčany Pluton, Bohemian Massif, in order to discuss the origin of compositional and textural zoning in granitic plutons and complex histories of horizontally stratified, multiply rep...

We report the thallium (Tl) isotope record in moderately contaminated soils, which have been historically affected by emissions from coal-fired power plants. Our findings clearly demonstrate that Tl of anthropogenic (high-temperature) origin with light isotope composition was deposited onto the studied soils, where heavier Tl (ε205Tl ∼-1) naturally...

Here, for the first time, we report the thallium (Tl) isotope record in moderately contaminated soils with contrasting land management (forest and meadow soils), which have been historically affected by emissions from coal-fired power plants. Our findings clearly demonstrate that Tl of anthropogenic (high-temperature) origin with light isotope comp...

Crystal-poor, low-viscosity mafic magmas in dikes and sills commonly show simple fabric patterns as represented by wall-oblique imbrication of vesicles, phenocrysts, microgranular enclaves or magnetic minerals (e.g. magnetite), implying simple flow regimes. To the contrary, crystal-rich magma mushes of trachytic composition may develop various sets...