Mineral and chemical composition of some claystones from the Troyanovo-3 mine, Maritsa East lignite basin, Bulgaria

Yossifova, Mariana G.; Dimitrova, Dimitrina; Ivanova, Rositsa

doi:10.1016/j.coal.2018.07.001

Cited by 9 publications

(2 citation statements)

References 41 publications

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“…However, this characterization is incomplete and heterogeneously distributed with regards to sources of Hg (e.g., there are scarce global data on oils or biomass compared with coal). On a national level, several studies characterize Hg contents in selected Bulgarian coals and fly ashes (e.g., Kostova et al, 2016;Yossifova, Dimitrova, 2017; see also summary in Vassilev, Vassileva, 2023), but no data exists on crude oils, gasoline, or biofuels. At the same time, fossil fuel consumption dominates energy production in Bulgaria at present including coal (predominantly locally sourced; 27%), oil (25%), and natural gas (13%); biofuels contribute another 10% (source: International Energy Agency).…”

Section: Selected Applications Of Hg Datamentioning

confidence: 99%

Mercury in geological materials from Bulgaria: Significance, applications, new analytical capabilities, and initial results

Georgiev,

Bidzhova

2023

Rev. Bulg. Geol. Soc.

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The chemical properties of mercury (Hg) such as volatility, organic affinity, multiple oxidation states and extreme biotoxicity, determine its various industrial applications, but also health hazard concerns. Mercury data on geologic materials are important for characterizing the main sources and sinks of Hg, for tracking volcanic activity in the geology past, for refining regional and global stratigraphic correlations, and for minimizing anthropogenic mercury emissions. Newly obtained Hg and CHNS analyzers available at the Geological Institute at the Bulgarian Academy of Sciences, facilitate new geologic and environmental research in Bulgaria. Here we show initial results for the accuracy and precision of our Hg analyses based on repeated measurements of certified reference material NIST 2702 and identify avenues for further analytical improvements. The encouraging results allow for the initiation of diverse geological and ecological studies that are needed, but currently lacking in Bulgaria.

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Section: Selected Applications Of Hg Datamentioning

confidence: 99%

Mercury in geological materials from Bulgaria: Significance, applications, new analytical capabilities, and initial results

Georgiev,

Bidzhova

2023

Rev. Bulg. Geol. Soc.

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“…A contribution by bacteria to the aromatization of angiosperm‐derived triterpenoids is also considered. Preliminary studies on composite samples of the claystone types of MIB characterize the peculiarities of their trace element (Yossifova, Dimitrova, & Ivanova, 2018) and mineral composition (Yossifova et al, 2018; Zaneva‐Dobranova, 1996). To the best of our knowledge, the available information on sediment‐lignite sequences is fragmentary and interdisciplinary studies have not been performed yet.…”

Section: Introductionmentioning

confidence: 99%

Palaeoenvironmental evaluation by geochemical proxies of fluvio‐lacustrine core log from the Late Miocene–Pliocene Maritsa Iztok Basin, Bulgaria

Milakovska

Stefanova

Vladislavov³

et al. 2020

Geological Journal

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A sequence of three lignite seams and interlayering carbonaceous mudstone is characterized by geochemical proxies. The study is extended by the palaeoenvironmental details given by the fossil fauna (gastropods, ostracods, and fishes). The predominant minerals (quartz and kaolinite) and main oxide relations of the carbonaceous mudstone point to sand and clay washed from weathered and/or altered felsic rocks from the catchment area. The mudstone features to deposition from suspension in standing or slow to persistently moving fresh waters at the bottom of the core log, and slightly aerated, warm, fresh to low saline, acidic to alkaline waters on the top. Three communities of organisms are depicted. The first is the pre‐swamp environment characterized by standing or slow moving fresh waters and detrital organic matter deposition. The second is the environment of swamp of detrital forest trunks. Depending on the climate and water table, the main forest communities are of trees of families Cupressaceae, Taxodiaceae, and Podocarpaceae accompanied by trees of family Betulaceae, and herbaceous plants. Different Sphagnum species are also abundant. The dry/cold environment is reflected in the herbaceous organic matter deposition. Polar terpenoids ratio differentiates slight climatic oscillations for the samples with a strong Gymnospermae dominance. The second coal seam development reflects the optimum tectonic conditions for peat growth in a cold and dry climate leading up to 25 m lignite deposition. The third is the moss swamp environment with very fluctuating elements. At the top of the log, a Sphagnum‐dominated peat has developed.

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Genesis of Smectites associated with a Coal Seams Succession in the Neogene Orhaneli and Keles Coal Deposits (Bursa), NW Turkey

Erkoyun

Kadır²,

Külah³

2022

Clays and clay miner.

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The Bursa-Orhaneli and Keles-Harmanalan coal deposits were developed in swampy and fluvial-lacustrine environments in western Anatolia under the E–W-trending graben zone during the Neogene. The present study aimed to determine the mineralogical and geochemical properties of clays interlayering the coal seams to define the origin of clay minerals, in particular, smectite. These deposits, comprising argillaceous sediment, marl, coal seam, mudstone, organic-rich shale, and sandstone, were deposited in a lacustrine environment accompanied by volcanogenic materials. The characteristics of sediments and their parent rocks were examined using X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, palynology, and chemical analyses. The association of abundant smectite with quartz, amphibole, accessory chlorite, and a decrease in feldspar in fluvial-lacustrine sediments compared to those in the smectite accompanied by feldspar and volcanic glass and the absence of quartz and amphibole in the pyroclastic units suggest that smectite had detrital and authigenic origins. Flaky smectite shows either detrital, irregularly outlined coating and filling pores of terrigenous sediments or in situ precipitation edging resorbed feldspar and devitrified volcanic glass. Chemical analyses of the smectite-rich fraction show montmorillonite compositions with an average structural formula of: (Ca0.42Na0.25K0.08)(Al2.76Fe0.47Mg0.59Ti0.07Mn0.002)(Si7.65Al0.35)O20(OH)4.The positive correlation of Al2O3 vs. TiO2 and K2O vs. Rb may be related to the abundant detrital input. Feldspar and biotite were replaced by illite during diagenesis.An increase in the Ni/Co and V/(V + Ni) ratios in the altered units also suggest oxic, suboxic to anoxic conditions, under the control of a dry, warm to subtropical climate in fresh water and lakes during the Late Eocene to Middle Miocene. The slight enrichment of light rare earth elements (LREE) compared to heavy rare earth elements (HREE) with positive Eu and positive/negative Ce anomalies reflect fractional crystallization of feldspar. The δ18O and δD values of smectite and illite fractions and the wide range of δ34S isotope values (–1.5 to 15‰) for pyrite and chalcopyrite associated with coal indicate a signature of both diagenetic and partial hydrothermal origin.

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Mineral and chemical composition of some claystones from the Troyanovo-3 mine, Maritsa East lignite basin, Bulgaria

Cited by 9 publications

References 41 publications

Mercury in geological materials from Bulgaria: Significance, applications, new analytical capabilities, and initial results

Mercury in geological materials from Bulgaria: Significance, applications, new analytical capabilities, and initial results

Palaeoenvironmental evaluation by geochemical proxies of fluvio‐lacustrine core log from the Late Miocene–Pliocene Maritsa Iztok Basin, Bulgaria

Genesis of Smectites associated with a Coal Seams Succession in the Neogene Orhaneli and Keles Coal Deposits (Bursa), NW Turkey

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