Magdolna Hetényi

Magdolna Hetényi
University of Szeged · Department of Mineralogy and Geochemistry

DSc

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45
Publications
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1,175
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Publications

Publications (45)
Article
Full-text available
This study is intended to clarify the depositional environment of a 180-m-thick, immature, limy Middle Miocene oil source rock interval, cored in the Zala Basin, western Hungary. For this purpose, a highly interdisciplinary approach was applied combining simple, standard micropaleontological, isotopic, and organic geochemical methods, rarely applie...
Article
Full-text available
The soil organic matter (SOM) pools with different stability play different roles in the agricultural and environmental processes, e.g. in the global carbon cycle. In this work Rock-Eval (RE) pyrolysis measurements and mathematical deconvolution of RE pyrograms were used for determining the abundance, quality, and main biological sources of SOM, as...
Article
Full-text available
Variations in the abundance of soil organic matter (SOM) constituents with different stability have a major impact on important environmental processes, e.g., carbon dioxide (CO2) fluxes between the soil and the atmosphere. Recently, besides the bulk Rock-Eval (RE) data, the mathematical deconvolution of the signals derived from hydrocarbon-like co...
Article
This paper presents organic geochemical records and a combined interpretation of organic geochemical and palaeoecological data for a late Pleistocene–Holocene shallow lake sequence. Abundance, bulk chemical composition and sources of the organic matter (OM), as well as the relative contribution of the labile and resistant bio- and geo-macromolecule...
Article
Full-text available
The primary aim of the research is to investigate the accumulation and distribution of organic material [OM] in saline shallow lacustrine sediments. This study focuses on the OM parameters of sediments at two areas with different hydrology, land use and vegetation cover. The study area is located at the Fehér Lake, Szeged (Hungary). The studied sal...
Article
The geochemical facies of Hungarian thermal waters were the object of this study. Samples were separated into groups by relative ages (δ 18O values). Mature and immature subgroups were formed on the basis of dissolved (semi)volatile organic compounds. The oldest (connate) waters form one group with a small number of samples. The subgroups containin...
Chapter
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A tanulmány célja az Üllés, Ruzsa és Bordány települések közelében, fúrásokkal feltárt Keceli Bazalt Formációban található repedezett szénhidrogén rezervoárral és lehetséges anyakőzetével kapcsolatos kutatási eredmények összefoglalása. Az erősen repedezett kőzetben négy értípust különítettünk el egymástól, és különböző termometriai módszerekkel viz...
Conference Paper
Our research aims at the complex geochemical study of the solid phase of salt-affected profiles, originating from natural lakes and lakes under anthropogenic use. This paper presents the results of pH and clay mineral XRD analyses performed on sediment profiles taken from four sites, two of which operate as a hatchery. It has been proved that pH in...
Article
Neogene sedimentany, strata in Hungary contain important mineral resourcs: pelitic rocks, deposited during the last major deltaic depositional cycle in the Pannonian Basin. are considered to be the principal sources of petroleum. The organic-geochemical investigations presented in this paper show that these Neogene sediments not onlv constitute a g...
Article
Full-text available
The amount and type of organic matter (OM), chemical and mineralogical compositions, and the amount and isotopic ratio of sulphur were measured and benthic foraminiferal assemblages were analysed in a 70 m thick core section comprising marine marls from the Eocene of Hungary. On the basis of Benthic Foraminiferal Oxygen Index (BFOI), the studied se...
Article
Full-text available
Processes and causes of biotic and environmental change at the Triassic–Jurassic transition remain controversial, partly because of a scarcity of Triassic–Jurassic boundary sections studied in detail. Continuous marine strata spanning the boundary are exposed at Csővár, Hungary, where new integrated stratigraphic data were obtained from multidiscip...
Article
Abundance, bulk chemical composition and sources of the organic matter in the surface horizon of the permanently water-covered part of an intermittently water-covered marsh were investigated. Lipids, insoluble non-hydrolysable macromolecular organic matter and black carbon fractions were isolated and examined via Rock-Eval pyrolysis, elemental anal...
Article
Full-text available
This paper presents an application of Rock-Eval pyrolysis for estimating the proportion of the components with different thermal stability in soil organic matter, the maturity of which corresponds to the early stage of diagenesis. For testing the validity of the modified Rock-Eval method, parallel series of pyrolysis were carried out on sedimentary...
Article
The southern Bida Basin in central Nigeria forms a part of the larger Bida or Middle Niger Basin, which is contiguous with the south east trending (petroliferous) Anambra Basin. These basins were major depocenters for Campanian–Maastrichtian sediments in southern and central Nigeria prior to the build up of the Tertiary Niger delta. The successions...
Article
This paper presents isotopic, bulk geochemical and biomarker data measured on organic matter accumulated in a narrow extensional basin developed at the oceanward margin of the huge Triassic carbonate platform in the Alps–Appenines domain. The integration of isotope signatures, organic petrographical and biomarker evidence together with the composit...
Article
Botryococcus braunii cells were grown until the late-stationary phase of growth and subsequently decomposed under oxic conditions for 201 days using a microbial consortium obtained from a freshwater lake. Degradation exhibited multi-G model kinetics, with a ‘labile’ fraction lost at a rate two to three times slower than those observed for the degra...
Article
The variations in the organic matter quantity and quality were studied with respect to the mineral composition of the carbonate sequences accumulated on a gentle slope (Zl-1 well) and at the toe of the slope (Rzt-1 well) located between a Late Triassic carbonate platform and a backplatform basin. Parallel variations observed in mineral composition...
Article
Full-text available
Most mass extinctions are linked with carbon isotope excursions, implying that biotic crises are coupled with changes in the global carbon cycle. The isotopic evolution during the end-Triassic extinction is far less documented than that for the other major Phanerozoic extinctions. Here we report a sharp and short-lived -3.50/00 excursion in carbon...
Article
Despite having an homogeneous lithology, the largest Hungarian maar-type deposit (Gérce oil shale, Pliocene) has previously been shown to exhibit substantial variations in organic matter quantity and quality with depth. This heterogeneity is also reflected, in the present study, by large variations in bitumen abundance and composition, for 23 sampl...
Article
The organic-rich late Triassic Kössen Formation (Hungary) was deposited in a shallow basin, situated between a carbonate platform and the continent. A large number (107) of samples of a 240 m thick, steeply dipping core section of the Kössen Fm., built up of mostly non-bioturbated sediments have been analysed by Rock-Eval pyrolysis. Organic petrogr...
Article
The organic matter of Pliocene oil shales from maar-type twin craters (Egyházaskeszö and Várkeszö) in Hungary was studied by different analytical techniques (Rock-Eval pyrolysis, bitumen analysis, FTIR, elemental analysis and pyrolysis of the insoluble material). The organic-rich, alginitic layers were deposited at the same time, under the same pal...
Article
Organic, inorganic and isotope geochemical investigations have been performed on 25 samples — 20 laminated marl samples and 5 re-sediment samples — taken from a 27 m thick black shale section of early Toarcian age, cropping out in the Northern Calcareous Alps. On the basis of MnO, Fe, organic carbon (TOC) contents and Hydrogen Index (HI) values, th...
Article
Most maturity indices can be used during catagenesis and metagenesis but there are only a few indicators to show the degree of organic maturation within the diagenesis zone. A previous study has already demonstrated that the oxygen index (OI) measured by Rock-Eval analysis provides reliable information about the early evolution stages of coals and...
Article
The Upper Benue rift comprising the Gongola and Yola Basins in Nigeria consist of the Aptian-Albian Bima Formation, the Yolde Formation (Cenomanian-Turonian), Gongila/Pindiga/Dukul Formation (Turonian-Coniacian) and Gombe Formation (Campanian-Maastrichtian). To evaluate the maturity and source rocks potential, vitrinite reflectance, Rock-Eval pyrol...
Article
About 60 samples from the non-bioturbated Úrkút Manganese Ore Formation (Bakony Mountains, Hungary), representing the early Toarcian anoxic event, were studied for: (1) TOC content, Rock-Eval parameters and kerogen δ13C; (2) S content and δ34S and (3) Al, Ca, Mn, Si and Ti contents. Using the example of the formation, a novel approach for estimatin...
Article
A maar-type Pliocene oil shale from Pula (Hungary) was examined by Scanning and Transmission Electron Microscopy (SEM, TEM) bitumen analysis, spectroscopic analyses (FTIR, solid state 13C NMR) and pyrolytic analyses of insoluble material. The investigated samples, corresponding to the “massive section” of Pula deposit, exhibit TOC values ranging fr...
Article
The effects of a mineral matrix on hydrocarbon generation from different types of kerogen were examined. Simulated thermal maturation of type I∗∗Results of the effect of montmorillonite and calcite on the thermal maturation of kerogen of type I were presented at the 16th International Meeting on Organic Geochemistry, Stavanger, 1993., III/a and III...
Article
Based on 13 published porewater H2S and sulphate profiles the amount of H2S escaping from non-bioturbated shales varies between some few % to 45% of the amount of bacterially generated H2S. This finding permits calculation of the original organic carbon (TOCor) content of immature nonbioturbated shales using TOC and sulphur content data. In two imm...
Data
Based on 13 published porewater H2S and sulphate profiles the amount of H2S escaping from non-bioturbated shales varies between some few % to 45% of the amount of bacterially generated H2S. This finding permits calculation of the original organic carbon (TOCor) content of immature nonbioturbated shales using TOC and sulphur content data. In two imm...
Article
The studied sequence of the Mako-3 well contains mostly Type III kerogen. The high organic carbon content and hydrocarbon potential indicated immature, good gas-prone organic matter in the Nagyalfold Formation, whereas delta front and delta slope depositional facies of the Algyo Formation, as well as prodelta facies of the Szolnok Formation, result...
Article
During the last 15 years several so-called maar-type oil shales have been discovered in Hungary. Pollen analysis indicates that the organic matter consists of planctonic algae, mainly of Botryococcus braunii. The organic geochemical features of two maar-type oil shales are compared. The two maar-type oil shales were formed under similar geological...
Article
The Menilite Beds (Carpathian Flysch Belt) contrast with the Tard Clay (Hungarian Paleogene Basin) and are characterized by a high rate of sedimentation and biogenic silica enrichment. The Menilite Beds are believed to have been deposited under sulphidic bottom water, while the existence of a sulphidic water at the bottom of the "Tard Sea' cannot b...
Article
Total organic carbon, extractable organic matter, sulfur content, kerogen type and saturated hydrocarbons have been determined in 25 core samples from an approximately 100 m thick section of the Oligocene Tard Clay, near Budapest. The Tard Clay records a five million year long anoxic cycle initiated by isolation of the sea, development of a positiv...
Article
Several Hungarian lignite and brown coal samples were studied by coal petrographical, palynological and organic geochemical methods. Three of these were chosen for a series of pyrolysis experiments. Thermal treatment was carried out on two H-rich Eocene brown coals (kerogen: Type II) and a H-poor Miocene lignite (kerogen Type III) between 200 and 5...
Article
Full-text available
1. Bevezetés A szerves geokémiai kutatások tárgya a geológiai kör- nyezetben (az atmoszférában, a felszíni és felszín alatti vízben, a talajban, a recens üledékekben és a kőzetekben) előforduló szerves anyag. A geológiai szerves anyag tömege, a globális szénciklusban játszott szerepe, ipari felhasználása és átalakulási folyamatainak a környezet, és...
Article
Full-text available
This work presents distribution patterns of fractions of soil organic matter (SOM) as a function of topography. Samples were taken from the A-horizons of chernozomic soils (between 138 and 122 m above the sea level) which differ in topography: located on the plateau (P), the upper third of the slope (S) and the toe of the slope (TS). Before the iso...
Article
Kutatási programunk célja az volt, hogy képet nyerjünk a paleozoikum és a mezozoikum határán lejátszódó, a fanerozoikum legnagyobb kihalásához vezető környezeti változások pontos menetéről és ennek alapján megkíséreljük az okok feltárását is. A bükki szelvények vizsgálata során biosztratigráfiai módszerekkel tisztáztuk a határ pontos helyzetét, rés...
Article
Izolálási eljárás és analitikai módszerek fejlesztése, tesztelése A talajok és a recens üledékek szerves anyagának (OM) megismerésére alkalmas geokémiai vizsgálati módszerek kifejlesztése az üledékes kőzetek szerves anyagának jellemzésére használt módszerek módosításával történt. A projekt keretében végrehajtott fejlesztések hozzájárultak a Rock-Ev...

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