12 research outputs found
Mineralogy and geochemistry of the Carnian (late triassic) of the Gerecse and Balaton highland basins, Hungary : implications for paleoenvironmental conditions during the Carnian pluvial event
Az ĂbĂĄnyai Aleurolit FormĂĄciĂł fekete palĂĄjĂĄnak izotĂłpgeokĂ©miai Ă©s szĂ©nhidrogĂ©ngenetikai jellemzĂ©se | Isotope geochemistry and characterization of hydrocarbon potential of black shale from ĂbĂĄnya Siltstone Formation
A toarci ĂbĂĄnyai Aleurolit FormĂĄciĂł rĂ©ka-völgyi szelvĂ©nyĂ©nek (Mecsek hegysĂ©g) alsĂł rĂ©szĂ©bĆl
gyƱjtött fekete pala mintĂĄk összes szerves szĂ©n-tartalma a laminĂĄlt kĆzettĂpusban 3,89â8,12%, a
vĂ©konyrĂ©teges vĂĄltozatban 2,14â3,29%. A Rock Eval pirolĂzis eredmĂ©nyei alapjĂĄn valamennyi minta II.
tĂpusĂș, Ă©retlen kerogĂ©nt tartalmaz. A rĂ©szletes optikai vizsgĂĄlat alapjĂĄn a szerves anyag szinte kizĂĄrĂłlag
alga eredetƱ (liptinit). A szĂĄrazföldi szerves anyag beszĂĄllĂtĂĄsa hĂĄttĂ©rbe szorult, a teljes szerves anyag
mennyiségére nézve kisebb, mint 3,2%. Az SP (szénhidrogén-potenciål) értékek alapjån a vizsgålt
kĂ©pzĆdmĂ©ny kivĂĄlĂł kĆolaj anyakĆzet, jĂłllehet adatainkat a feltĂĄrĂĄsban vĂ©gbement oxidĂĄciĂł
befolyĂĄsolhatta. A dĂșsĂtott kerogĂ©n stabil szĂ©nizotĂłpos összetĂ©tele (delta(13)C(org), VâPDB) â30,9 Ă©s â28,6% közötti. A laminĂĄlt
fekete palĂĄhoz viszonyĂtva a vĂ©konyrĂ©teges palamintĂĄk kisebb TOC- Ă©s a teljes liptinithez viszonyĂtott
nagyobb bitumentartalma, tovĂĄbbĂĄ a kisebb hidrogĂ©n index Ă©s a kevĂ©sbĂ© negatĂv delta(13)C(org) Ă©rtĂ©kek a labilis,
tengeri eredetƱ szerves anyag korai diagenetikus oxidĂĄciĂłjĂĄt tĂŒkrözik. A fekete pala karbonĂĄtjĂĄnak stabil
szén- és oxigénizotópos összetételét a diagenezis homogenizåló hatåsa befolyåsolta, ezért az
Ćskörnyezeti viszonyok jellemzĂ©sĂ©re nem hasznĂĄlhatĂł fel. | In the black shale samples collected from the lower part of the RĂ©ka Valley section (Mecsek Mts.) of
the Toarcian ĂbĂĄnya Siltstone Formation, total organic carbon (TOC) contents vary between 3.89 and
8.12% for laminated lithotype and between 2.14 and 3.29% for thin-bedded one. Rock Eval data indicate
a type II, immature kerogen throughout the section. Detailed optical analysis reflects that the organic
matter is composed almost exclusively of material linked to an algal origin (liptinite). The terrestrial plant
debris constituents occur as a backround input signal, which accounts for a maximum of less than 3.2%
of the total organic matter. According to the SP (source potential) values these rocks have an excellent
petroleum potential; however, our data may be affected by outcrop weathering.
The kerogen carbon isotopic composition ranges from delta(13)C(org) value of â30.9 to â28.6% (relative to
VâPDB). Relative to the laminated black shale samples, lower TOC and higher bitumen contents in the
liptinite fraction together with lower hydrogen index and higher delta(13)C(org) values in the thin-bedded black
shale samples reflect an early diagenetic oxidation of labile marine organic matter. Measured delta(13)C(carb) and
delta(18)O(carb) values show that the carbonate composition of the black shale samples is strongly affected by
homogenizing effect of diagenesis. Therefore, these data can not be used to infer palaeoenvironmental
conditions
Distribution and composition of Mg-calcite and dolomite in the water and sediments of Lake Balaton
Lake Balaton is a large and shallow lake that is of great economic and cultural importance in landlocked Hungary. Even though the lake has been studied extensively in the last century from a large number of scientific aspects, the mineralogy of its sediments has not been fully explored. The mud at the bottom of the lake consists mostly of silt-sized grains of carbonate minerals with compositions between those of calcite (CaCO3) and dolomite CaMg (CO3)2. In order to understand the processes of carbonate precipitation and the influence of water budget fluctuations on the mineralogical character of the sediment, we used X-ray powder diffraction to analyze the changes of cell parameters of carbonate minerals in the upper half meter of the sediment. The major carbonate phase is Mg-calcite that shows a distinct reduction in cell parameters from west to east, reflecting an increase of its Mg-content, in parallel with a gradient of dissolved Mg/Ca ratio in the water. Intriguingly, dolomite, the other widespread carbonate phase in the sediment, also shows a change in cell parameters from west to east, with the deviations from values of stoichiometric dolomite being largest in the Eastern Basin of the lake. The similar pattern of cell parameter changes of Mg-calcite and dolomite suggests that ordered dolomite with slightly anomalous, Ca-rich composition also forms in the lake, probably by direct precipitation from the water. In contrast, protodolomite forms within the sediment through diagenetic processes. Based on our X-ray powder diffraction measurements, we propose a model of carbonate mineral formation and transformation in Lake Balaton. Since the Mg/Ca ratio of the water appears to be the major factor in controlling the compositions of carbonate minerals, and this ratio in turn is governed by the amount of water supply, the properties of the precipitating carbonate minerals are affected by the actual level of the lake water
A Mecseki- Ă©s a VillĂĄny-Bihari-zĂłna Ćsföldrajzi viszonyainak feltĂĄrĂĄsa a felsĆ-triĂĄsz - közĂ©psĆ-krĂ©ta kĂ©pzĆdmĂ©nyek sokoldalĂș elemzĂ©se alapjĂĄn = Palaeogeographic connections of the Mecsek and VillĂĄny-Bihar Zones based on multilateral analyses and studies of the Upper Triassic - Middle Cretaceous formations
Az irodalmi elĆkĂ©szĂtĂ©ssel kivĂĄlasztott felsĆ-triĂĄsz â alsĂł-krĂ©ta elĆfordulĂĄsok rajzos Ă©s fĂ©nykĂ©pi dokumentĂĄlĂĄsa, anyagvizsgĂĄlati mintĂĄzĂĄsa alapjĂĄn kezdĆdtek meg a csiszolatos szöveti Ă©s mikrofĂĄcies vizsgĂĄlatok. Ezzel egyidĆben folyt a nagy szĂĄmĂș fĂșrĂĄsi rĂ©tegsor ĂĄttekintĆ, ill., rĂ©szletes Ă©rtĂ©kelĂ©se. ĂjravizsgĂĄltuk több tucat fĂșrĂĄs raktĂĄri maganyagĂĄt. Az anyagvizsgĂĄlati keret jelentĆs rĂ©sze önĂĄllĂł alcĂm alatt az MTA GKL-ben, mĂĄs rĂ©sze a MĂFI-ban, ill., több kutatĂłhelyen kerĂŒlt felhasznĂĄlĂĄsra kĂŒlönbözĆ szakirĂĄnyokban. NĂ©hĂĄny konkrĂ©tum A VillĂĄnyi-hegysĂ©g szerkezetföldtani felmĂ©rĂ©se sorĂĄn 6 szerkezeti fĂĄzis elkĂŒlönĂtĂ©sĂ©re kerĂŒlt sor. A hegysĂ©g arculatĂĄt alapvetĆen a transzpressziĂłs tenzortĂ©r szabta meg. A komlĂłi szĂ©nkutatĂĄsi terĂŒleten elkĂ©szĂŒlt az alsĂł-jura formĂĄciĂłk vastagsĂĄgi Ă©s kavics (breccsa) tartalmĂș rĂ©tegeinek fajlagos vastagsĂĄgi tĂ©rkĂ©pe. A vastagsĂĄgi maximumok egybeesĂ©se jelzi, hogy a medencĂ©n belĂŒl hosszĂș ideig lĂ©teztek gyorsabban, illetve lassabban sĂŒllyedĆ terĂŒletek. Az ĂĄsvĂĄnykĆzettani Ă©s paleontolĂłgiai adatok alapjĂĄn meghatĂĄrozĂĄsra kerĂŒlt a nagy szervesanyagtartalmĂș toarci rĂ©tegek kĂ©pzĆdĂ©si ideje Ă©s a rĂ©tegsor rövid ciklusĂș vĂĄltozĂ©konysĂĄga. HasonlĂł alapokon klimavĂĄltozĂĄsi ciklusokat ĂĄllapĂtottak meg a kora-jurĂĄtĂłl a közĂ©psĆ-jurĂĄig terjedĆen. Modell szinten alapvetĆen ĂĄtĂ©rtĂ©keltĂŒk a Tiszai-egysĂ©g fejlĆdĂ©störtĂ©netĂ©t. E szerint a leszakadĂĄsi folyamat a közĂ©psĆ-triĂĄsz vĂ©gĂ©n kezdĆdött el, konszolidĂĄciĂłja a kora-krĂ©ta vĂ©gĂ©n a takarĂłkĂ©pzĆdĂ©s megindulĂĄsĂĄval vette kezdetĂ©t. | Figures, photographs and rock sampling of Upper Triassic to Lower Cretaceous surface outcrops were the base for starting textural and microfacies studies of surveying character. Documentation of many wells and boreholes were revised in varied details. It is followed by studies of cores of dozens of boreholes. A significant part of the mount for lab studies were dedicated for MTA GKL in a contract, the rest was used by MĂFI and other research places for varied scientific directions. Major achievements: Based on microtectonic studies VillĂĄny Hills 6 tectonic phases were distinguished in the VillĂĄny Hills. The character of the VillĂĄny Range is determined by transpressional stress fields. Thickness maps of the Lower Jurassic formations and their pebbleâbearing beds of the KomlĂł coalfield have been prepared. The coincidences of the maximum thicknesses of the map sets gave evidences for the long existence of both the quickly and the slowly sinking areas of the basin. The formation time and the short-cyclic variability of the organic-rich Toarcian beds were established on recently gained data set. In a similar way cycles of climatic changes were appointed for the Early Jurassic epochs. Using basic geological data the model of the palaeogeographic history of the Tisza unit is reassessed fundamentally. According to this the process of separation started at the end of the Middle Triassic and the consolidation begun with the formation of nappe system at the end of the Early Cretaceous
Distribution and composition of Mg-calcite and dolomite in the water and sediments of Lake Balaton
Palynological and X-ray fluorescence (XRF) data of Carnian (Late Triassic) formations from western Hungary
The data presented in this article are related to the research article âPalynology and weathering proxies reveal climatic fluctuations during the Carnian Pluvial Episode (CPE) (Late Triassic) from marine successions in the Transdanubian Range (western Hungary)â (Baranyi et al., 2019). Palynological and palynofacies counts and mineralogical data are presented that build the core for the palaeoenvironmental and palaeoclimatic interpretation discussed in the original research article. Other component of this data article is the description of the applied laboratory and analytical techniques. We also supply microscopic images of the identified pollen and spores and a list of all identified palynomorphs
Palynology and weathering proxies reveal climatic fluctuations during the Carnian Pluvial Episode (CPE) (late Triassic) from marine successions in the Transdanubian Range (western Hungary)
Palynology and weathering proxies reveal climatic fluctuations during the Carnian Pluvial Episode (CPE) (late Triassic) from marine successions in the Transdanubian Range (western Hungary)
Saharan, Aral-Caspian and Middle East dust travels to Finland (1980â2022)
Studies on atmospheric dust and long-range transport of mineral dust have been a focus of atmospheric science in recent years. With its wide range of direct and indirect effects, mineral dust is one of the most uncertain elements in the mechanisms of climate change, and a deeper understanding of its role is essential for understanding future processes.The aim of our research was to provide the first systematic data on the so far episodically documented northward transport mineral dust from arid-semiarid areas. So, in this paper, we present dust storm events from lower latitudes reaching the Finnish atmosphere, based on the MERRA-2 model Dust Column Mass Density data and after a multistep verification procedure using independent data source. In total, 86 long-range dust storm events were identified between 1980 and 2022, when air masses loaded with dust reached Finland. Based on backward-trajectories different sources were identified: 59 were Saharan, 22 were Aral-Caspian, and five were associated with Middle Eastern source areas. Considerable variation in inter-annual frequencies was observed among the source areas, which may be due to changes in circulation conditions and the effects of human activity (agriculture and land use changes in Aral Sea region).There is a clear maximum of dust events in spring (60%), followed by summer and autumn (where 10 of the 11 autumn episodes were from the Sahara). However, the number and proportion of scarce winter events have more than doubled since 2010 compared to the preceding 30Â years, but no autumn events were registered during this period. This clear temporal variation coincides with changes in dust transport observed in other regions of Europe, driven by greater atmospheric meridionality associated with climate change and driven by reduced temperature difference between low and high latitudes due to enhanced temperature increases at Arctic regions