TY - JOUR AU - Polgári, Márta Piroska AU - Hein, JR AU - Németh, Tibor AU - Pál-Molnár, Elemér AU - Vigh, Tamás TI - Celadonite and smectite formation in the Úrkút Mn-carbonate ore deposit (Hungary) JF - SEDIMENTARY GEOLOGY J2 - SEDIMENT GEOL VL - 294 PY - 2013 SP - 157 EP - 163 PG - 7 SN - 0037-0738 DO - 10.1016/j.sedgeo.2013.05.017 UR - https://m2.mtmt.hu/api/publication/2346494 ID - 2346494 LA - English DB - MTMT ER - TY - JOUR AU - Vigh, Tamás AU - Kovács, Tibor AU - Somlai, János AU - Kávási, Norbert AU - Polgári, Márta Piroska AU - Biró, Lóránt TI - Terrestrial radioisotopes in black shale hosted Mn-carbonate deposit (Úrkút, Hungary) JF - ACTA GEOPHYSICA J2 - ACTA GEOPHYS VL - 61 PY - 2013 IS - 4 SP - 831 EP - 847 PG - 17 SN - 1895-6572 DO - 10.2478/s11600-013-0124-2 UR - https://m2.mtmt.hu/api/publication/2337694 ID - 2337694 AB - Previously, little attention has been paid to terrestrial radioisotopes (U, Th, 40K) occurring in manganese ores, despite the fact that the biogeochemical relationship between Mn and U is versatile. Occurrence of terrestrial radioisotopes in great amounts during mining on a long-term causes significant radiation exposure. It is important to inspect black shale-hosted manganese ores from this aspect, as black shales are typically potential U-rich formations. Despite the increased radon concentration in the mine, based on the detailed major elements, trace elements and gamma spectroscopy inspection of the rock types of deposit, the U, Th enrichment was undetectable. However, the U and Th content of about average terrestrial abundance of the great ore amount may be in the background of the increased radon concentration level. This Mn-carbonate ore deposit in spite of the low U content exhibit potential radon danger for miners, which can be eliminated with intensive air change only. © 2013 Versita Warsaw and Springer-Verlag Wien. LA - English DB - MTMT ER - TY - JOUR AU - Polgári, Márta Piroska AU - Hein, J R AU - Tóth, Attila Lajos AU - Pál-Molnár, Elemér AU - Vigh, Tamás AU - Biró, Lóránt AU - Fintor, Krisztián TI - Microbial action formed Jurassic Mn-carbonate ore deposit in only a few hundred years (Úrkút, Hungary) JF - GEOLOGY J2 - GEOLOGY VL - 40 PY - 2012 IS - 10 SP - 903 EP - 906 PG - 4 SN - 0091-7613 DO - 10.1130/G33304.1 UR - https://m2.mtmt.hu/api/publication/2034050 ID - 2034050 AB - The Úrkút (Hungary) manganese (Mn) ore, hosted by Jurassic black shale, was studied using high-resolution mineralogical, microtextural, and chemical methods. Two independent superimposed biostructures were identified consisting of rhythmic laminations that provide important proxies for paleoenvironments and duration of ore formation. Millimeter-scale laminae reflect a depositional series of Fe-rich biomats, mineralized microbially produced sedimentary structures. These biomats formed at the sediment-water interface under dysoxic and neutral pH conditions by enzymatic Fe2+ oxidizing processes that may have developed on a daily to weekly growth cycle. The early diagenetic sedimentary ore is composed of Ca rhodochrosite, celadonite, and smectite, and also shows a 100-µm-scale element oscillation that produces Mn(Ca)-rich and Si(Fe clay)-rich microlaminae. This microlamination may reflect a 10 h to daily rhythmicity produced by the growth of microbial communities. If true, then the giant Úrkút ore deposit may have formed over hundreds of years, rather than hundreds of thousands of years as previously thought. LA - English DB - MTMT ER - TY - JOUR AU - Polgári, Márta Piroska AU - Hein, JR AU - Vigh, Tamás AU - Szabó-Drubina, M AU - Fórizs, István AU - Biró, Lóránt AU - Müller, A AU - Tóth, Attila Lajos TI - Microbial processes and the origin of the Úrkút manganese deposit, Hungary JF - ORE GEOLOGY REVIEWS J2 - ORE GEOL REV VL - 47 PY - 2012 IS - SI SP - 87 EP - 109 PG - 23 SN - 0169-1368 DO - 10.1016/j.oregeorev.2011.10.001 UR - https://m2.mtmt.hu/api/publication/1865071 ID - 1865071 N1 - Institute for Geochemical Research, Hungarian Academy of Sciences, 1112 Budapest, Budaörsi út 45, Hungary USGS, 400 Natural Bridges Dr., Santa Cruz, CA 95060, United States Mangán Ltd. Úrkút, Külterület 1, H-8409, Hungary Department of Mineralogy, Geochemistry and Petrology, University of Szeged, H-6701 Szeged, P. O. Box 651, Hungary Research Institute for Technical Physics And Materials Science, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege út 29-33, Hungary Cited By :110 Export Date: 25 March 2024 Correspondence Address: Polgári, M.; Institute for Geochemical Research, , 1112 Budapest, Budaörsi út 45, Hungary; email: rodokrozit@gmail.com LA - English DB - MTMT ER -