Yulia V. Erban Kochergina

Yulia V. Erban Kochergina
Czech Geological Survey · Laboratory of Radiogenic Isotopes

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About

50
Publications
6,848
Reads
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210
Citations
Citations since 2017
36 Research Items
201 Citations
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20172018201920202021202220230204060
20172018201920202021202220230204060
20172018201920202021202220230204060
Additional affiliations
September 2012 - present
Charles University in Prague
Position
  • PhD Student
March 2012 - present
Czech Geological Survey
Position
  • Researcher

Publications

Publications (50)
Article
Peridotite xenoliths brought to the surface by basaltic lavas attest to a variety of mantle processes, including partial melting, melt percolation or refertilization. The whole rock Re–Os concentrations and Os isotopic compositions were determined for 30 xenoliths collected from 11 localities across the northern Bohemian Massif in order to evaluate...
Article
Full-text available
The possible presence of carbonatites in the Eger Rift (NW Bohemian Massif, Czech Republic) has been debated for several decades without any apparent resolution. Here, we document an almost 2 m thick dyke of a silicocarbonatite (23 wt. % SiO2, 27 wt. % CO2) in the R2 (Roztoky nad Labem) drilling at the depth of 152.9–154.8 m. Despite the fact that...
Article
Assuming that strontium (Sr) isotope ratios in trees mirror the bedrock isotope signal, between-site 87 Sr/ 86 Sr comparisons can serve as a powerful tool in archaeological wood provenance studies. Here we discuss the strengths and weaknesses of this approach using Sr isotope data for bedrock, trees and rainfall collected at seven sites in the Czec...
Article
Magnesium, calcium and strontium isotope systematics were studied in a Central European headwater catchment underlain by granite. The Uhlirska catchment (Czech Republic) is recovering from acidification following 40 years of acid rain. A combination of isotope and non-isotope data was used to constrain the origin of base cations in runoff. Whole-ro...
Article
Full-text available
In countless modern geochemical studies, diverse biological and geologic samples are analyzed for Sr, Nd, and Pb isotopic composition. Such heterogeneity presents challenges for a “one-size-fits-all” approach to sample preparation, necessitating customization of sample preparation and chromatographic separation methods. We present (1) digestion tec...
Article
The Moldanubian Zone of the Bohemian Massif was intruded by three Variscan (c. 354–335 Ma) subduction-related plutonic suites. Their mantle sources evolved from CHUR-like (low-K calc-alkaline suite), through slightly enriched (ε346Nd ~ − 3; high-K calc-alkaline suite—HKCA) to strongly enriched (ε337Nd < − 7.5; (ultra-)potassic suite—UK). This evolu...
Article
Most chromium (Cr) entering the ocean originates from continental weathering of ultramafic rocks. Recent data indicate that (i) mantle-derived rocks are characterized by homogeneous δ⁵³Cr values of approximately −0.12‰; (ii) some serpentinized peridotites, serpentinites and weathered serpentinites contain isotopically heavier Cr than mantle protoli...
Article
Highly magnesian and potassic (MgK) magmatism is a characteristic feature of the European Variscan Belt. These magmatic rocks have an odd dual geochemical character: they have both high mg# and transition metal contents indicative of being derived from the mantle (and not having lost that character via magmatic differentiation), while simultaneousl...
Article
Full-text available
We describe the occurrence and possible origin of rare beds 1–10cm thick and containing 20–70% of crandallite, a Ca-Al phosphate enriched in Sr and Ba, found within otherwise monotonous clay-rich lacustrine sediments of the Most Basin in the Central-European Neogene Ohře Rift system. The beds were formed at ca. 17.31, 17.06, and 16.88Ma, while the...
Article
Late-Variscan (S-, A-type) granites and rhyolitic ignimbrites/lavas (~325 Ma) of the Altenberg-Teplice Caldera (Erzgebirge/Krušné hory Mts., NW Bohemian Massif) were investigated by mineral and whole-rock chemistry and Nd, Pb isotopic systematics. Focus was given to the normally zoned Teplice Rhyolite (TR) volcanic successions and, to a lesser exte...
Article
Full-text available
Thin loess deposits are widespread soil parent materials and important archives for paleoenvironmental reconstruction. The origin of loess in SW Poland is attributed to the Great Odra Valley (GOV), following the general concept that large rivers play a major role in regional silt supply. Yet, the precise provenance (glacier sources and/or local roc...
Article
This study deals with the remains of metal objects from the settlement of workers living and labouring at the Egyptian site of Giza in the reigns of Dynasty 4 Kings Khufu and Khafra (c. 2500–2450 BCE). It provides the first detailed set of data on copper tools of the craftspersons working with wood, limestone, textile, etc., focusing on the major a...
Article
Full-text available
We present the results of a complex archaeometric study of Late Bronze Age copper ingots from the Staré Hodějovice hoard (South Bohemia). In order to understand the origin of the copper and describe the metallurgical process, we use modern analytical methods (metallography analyses, major/trace element and lead isotope analyses) to describe the sam...
Article
The Třebíč Pluton (TP) comprises plutonic rocks of the ‘durbachite series’, i.e., ultrapotassic biotite–amphibole quartz melasyenites–melagranites with conspicuous K-feldspar phenocrysts and abundant mafic enclaves. The TP with its satellite bodies intruded the eastern Moldanubian Zone (orogenic root of the Variscan Bohemian Massif) at c. 338 Ma. O...
Article
Lithogenic and biologically-fractionated magnesium (Mg) and calcium (Ca) are viewed as alternative controls of the δ 26 Mg and δ 44 Ca isotope signatures of streams and rivers. Understanding of Mg-Ca isotope systematics and of runoff generation in headwater catchments is crucial for upscaling riverine variability in δ 26 Mg and δ 44 Ca values to Mg...
Article
Calcium and strontium isotope ratios were used to identify Ca sources for bulk soil, soil solutions and runoff in the stressed forest ecosystems of Central Europe. All three study sites are underlain by Ca-poor crystalline bedrock (orthogneiss, leucogranite and serpentinite, respectively), but differ in historical rates of acid deposition. UDL, the...
Conference Paper
Full-text available
The Variscan Orogen of western and central Europe contains voluminous exposures of (ultra)-potassic intrusive rocks, the most characteristic being durbachites (strongly porphyritic Amph-Bt qtz syenite-melagranite). Coevally intruded at ca. 345-335 Ma, these rocks can yield information on geodynamic processes operating at the height of collision. We...
Article
We present the interpretation of tectono-sedimentary evolution of the West Sudetic area (central Europe) during the latest Turonianemiddle Coniacian as recorded by deposits of the NW part of the Bohemian Cretaceous Basin. This paper provides thefirst strontium isotope curve from the Upper Cretaceous of the Bohemian Massif. The exact stratigraphic f...
Article
Full-text available
Weakly differentiated rocks such as basaltic trachyandesites occur rather rarely in the Cenozoic České Středohoří Volcanic Complex (Central Europe, Czech Republic). We present mineralogical, petrological and geochemical data for a basaltic trachyandesite sill located at the southern margin of the České Středohoří Volcanic Complex, where several sma...
Article
Full-text available
Early efforts at remediation of contaminated soils involve overturn or removal of the uppermost soil horizons. We find that such disruption is counterproductive, as it actually increases the mobility of the heavy metals involved. In our study, we sought to replicate in a controlled manner this commonly used remediation strategy and measure Pb, Zn,...
Conference Paper
The research of Old Kingdom copper metallurgy is hindered by several problems. The number of archaeometallurgical analytical methods available in Egypt is limited, and it is almost impossible to export samples, although only about 50 milligrams of material would suffice for reasonable results. Old Kingdom artefacts abroad are in many cases unique o...
Article
Two Neoproterozoic carbonatite suites of spatially related carbonatites and associated silicate alkaline rocks from Sevattur and Samalpatti, south India, have been investigated in terms of petrography, chemistry and radiogenic–stable isotopic compositions in order to provide further constraints on their genesis. The cumulative evidence indicates th...
Article
Full-text available
The Altenberg–Teplice Volcanic Complex (ATVC) exposed on both sides of the German–Czech border in the Erzgebirge/Krušné hory Mts. is one of the earliest late-Variscan to post-Variscan volcanic centres in Europe. The ATVC features an early volcanosedimentary succession preserved in the Schönfeld–Altenberg Depression Complex (SADC), covered by volumi...
Article
Peridotite xenoliths brought to the surface by basaltic lavas attest to a variety of mantle processes, including partial melting, melt percolation or refertilization. The whole rock Re–Os concentrations and Os isotopic compositions were determined for 30 xenoliths collected from 11 localities across the northern Bohemian Massif in order to evaluate...
Article
Keywords: Načetín, fly ash, lead, zinc, antimony, barium, soils, hazardous elements, contamination, BCR sequential extraction The release of hazardous elements from anomalous geomaterials represents risk for the environment. In our research, we focused on exogenic alteration of fly ash (FA) originating from glass-works in Svetla nad Sazavou (Czech...

Questions

Question (1)
Question
Please can anyone help us with the following? In an acidified headwater catchment underlain by paragneiss, we are using Mg, Ca and Sr isotope ratios to identify the proportion of these elements of geogenic and anthropogenic origin in the runoff. We isotopically analyzed 11 catchment compartments, including several organic pools and are aware of Mg, Ca isotope fractionations. We have the isotope composition of the main rock-forming and accessory minerals in addition to whole-rock isotope signatures. Individual minerals exhibit a wide range of Mg, Ca and Sr isotope ratios. For a rigorous interpretation of the data set we would need to know the relative dissolution rates of apatite, biotite, muscovite, albite, orthoclase and ilmenite. The reviewers will likely request a kinetic model to estimate the order of these six minerals from the fastest weathering to the slowest weathering mineral. We are aware of the complexity of such kinetic modelling. We believe a general sequence of weathering rates of these six minerals with some in-depth discussion of the uncertainties would do. As a rule, the reviewers are mostly sceptical about the relevance of equilibrium modelling, such as PHREEQC, and/or just invoking the Goldich (1938) and Bowen (1956) scheme. Would you know of a publication that would for any paragneiss site report kinetic modelling of mineral weathering considering as many minerals as possible, preferably also including ilmenite?

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Cited By

Projects

Projects (5)
Project
Deep subduction and relamination of felsic continental crust rich in radiogenic elements have far-reaching consequences for the thermal state and rheology of the orogenic lithosphere as well as mantle enrichment processes. The project proposes an integrated study of petrology, geochemistry and Sr–Nd–Pb–Li–O–Mg–Cr isotopic systems in Early Carboniferous ultrapotassic plutons, related to deep subduction of continental crust, in Bohemian Massif, French Massif Central and Vosges. This study should provide pivotal information about mantle and crustal sources of parental magmas in the Variscan orogenic root (Moldanubian Zone) and their further evolution. In turn, these data represent a key input into any large-scale model aimed at explaining the geotectonic development of the European crust and lithospheric mantle. More importantly, the proposed research should improve our understanding of the nature and genesis of ultrapotassic magmas with peculiarly mixed mantle–crustal signatures, as well as the general geotectonic development of younger collisional orogens, e.g. Andes or Himalayas.
Archived project
Grant Agency of Charles University, Grant No. 38715 This project focused on the detailed study of the museum collection, the artefacts from the Egyptian Museum of Leipzig University, sampled with kind permission granted by the collection curator, dr. Dietrich Raue. Project was lead in cooperation with Jiří Kmošek, a specialist in archeometallurgy.
Project
Using petrological, geochronological and geochemical methods to constrain the variability and causes for variability in (meta-) igneous rocks of the Bohemian Massif. The main emphasis is on petrogenesis and geodynamic setting of the studied magmatic suites.