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001-es BibID:	BIBFORM018842
Első szerző:	Sütő László (geográfus)
Cím:	Secondary mineralisation processes in coal pit heaps and its impact on the environment in NE Hungary / László Sütő, Miklós Kozák, Richard W. McIntosh, Zoltán Püspöki, Imre Beszeda
Dátum:	2007
ISSN:	1788-4497
Megjegyzések:	Ottnangian-Karpatian brown coal seams were exploited from the late 19th century producing numerous pit heaps accumulatedbetween 1920 and 1970 in the hilly foreground of the Bükk Mountains, northern Hungary. The aim of this paper was the observation ofthe processes in the pit heaps and its environmental impacts.The five coal seams were formed in paralic transgressional-progradational swamps. The oxihydration of the pyrite and marcasitecontent of the coal heap resulted in the production of sulphuric acids that exposed the components of the embedding sediments.Furthermore, the self-combustion of the partly siliceous and fragmented coal material in the pit heap was frequent. In this partly opensystem with varying temperature, hydrothermal, low-pressure and high-temperature pneumatolitic and thermo-contact microenvironmentsoccurred simultaneously. In remobilising the original elements of the organic and the heap material, the migration of theadsorbed water and the gravitational free water equally played an important role. According to the microscopic, micromorphologicalelectron microscopic, microprobe and X-ray analyses, primarily, sulphates occur in the heaps and the formation of rhombic native sulphuris frequent.The environmental impact of the re-mineralisation processes was studied. The results showed that only a few soluble componentshad moderately damaging effects on natural fresh water and groundwater and only a few caused the increase of As-, Sr-, Fe-, Mn-, SO4contents. Due to local dilution, these were only occasionally increased above the tolerance limit.Micro-climatic and ecological measurements were made on the surface of the heaps. These observations prove that the temperatureof the soil developing on the top of the heap is higher than in the surroundings of the heaps. At places sulphur exhalation andtransitionally slightly toxic element concentrations can be detected. As a result a moderately deteriorated pioneer vegetation appeared onthe pit heaps.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban coal pit heaps self-combustion mineralization water contamination environmental impact
Megjelenés:	Acta geographica ac geologica et meteorologica Debrecina. Geology, geomorphology, physical geography series. - 2 (2007), p. 41-45. -
További szerzők:	Kozák Miklós (1948-) (geológus) McIntosh, Richard William (1978-) (geológus) Püspöki Zoltán (1972-) (geológus) Beszeda Imre (1966-) (okl. anyagtudományi mérnök-fizikus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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