Fehér Béla (szerk.): Az ásványok vonzásában, Tanulmányok a 60 éves Szakáll Sándor tiszteletére (Miskolc, 2014)
Németh Norbert - Kasó Attila: Talajgeokémiai vizsgálatok a rudabányai színesfémérc-előfordulások kutatásában
Fehér B. (szerk.) (2014): Az ásványok vonzásában. Tanulmányok a 60 éves Szakáll Sándor tiszteletére. Herman Ottó Múzeum és Magyar Minerofil Társaság, Miskolc, pp. 191-202. Talajgeokémiai vizsgálatok a rudabányai színesfémére-előfordulás kutatásában Soil geochemistry in the prospecting of the base metal mineralization at Rudabánya NÉMETH Norbert1* & ifj. KASÓ Attila2 1 Miskolci Egyetem, Ásványtani-Földtani Intézet, 3515 Miskolc-Egyetemváros 2 Rotaqua Kft., 7673 Kővágószőlős * E-mail: foldnn@uni-miskolc.hu Abstract The Institute of Mineralogy and Geology in the University of Miskolc has been running a precious and base metal prospecting project in cooperation with the Rotaqua Ltd since 2007 at Rudabánya, in the abandoned iron ore mine and its surroundings. The imbricate, partly limonitized, siderite ore bodies also contain baryte and base metal sulphides formed in several phases and the oxidation products of all these primary ore minerals; in consequence, Rudabánya is famous for its rich mineral assemblage (Szakáll, 2001). The recent prospecting also revealed stratiform sphalerite-galena mineralization in the fine-grained siliciclastic country rock (Németh et al., 2013). In the frame of this prospecting soil samples were collected on the NE part of the licensed area around the villages Alsótelekes, Felsőtelekes and Szuhogy. Samples were taken in 50 m steps along 200 m spaced NW-SE grid lines nearly perpendicular to the strike of the Damó Zone from a depth of30-50 cm. Sampling points on inhabited areas of the villages were omitted. Samples coming unambiguously from waste dumps and areas covered by Pannonian sediments were not assayed. So the chemical analyses of440 soil samples were performed by the ALS Chemex Laboratory with aqua regia digestion and ICP-AES for 35 elements. Analysing the data, the spatial distribution of the assayed concentrations was studied, primarily that of the major base metals of the mineralization: Cu, Pb and Zn. Where concentrations exceeded the modal values (Table I) at least five times in adjacent sampling points, it was regarded as a real anomaly. An outstanding enrichment (as much as some tenth percent Pb, Zn and some hundred ppm Cu) was found on the Ruda Hill, but this comes partly from dispersed waste of ancient pits and adits. This fact was confirmed by soil probes (Table II). However, Pb anomalies exceeding 100 ppm and Zn anomalies exceeding 1000 ppm were found E of Alsótelekes on the area not disturbed by mining. These Zn-Pb anomalies appear together with the enrichment of Ca, but not of Fe, possibly indicating carbonate- but not siderite-hosted mineralizations. Correlations of the elements were studied by calculating linear correlation coefficients, although empirical distributions cannot be regarded as normal. There were elements with concentrations below the detection limit in the majority of the samples; these were included reservedly into the analysis. We accepted values above 0.7 for existing correlations and values above 0.5 for probable correlations. A definite correlation was observed in the Pb, Zn, Sb, As, Hg group together with Ag and Cd, which are in most cases below the detection limit (Table III). The copper also seems to be correlated with these elements. These correlations, however, are weak or absent in soils with Ca-content below 1 % (Table IV). This association is characteristic for the sulphide ores known from the mine, and surely indicates the debris of them and their carbonate host rock in the soil. Another correlated element group is the Al, Be, Cr, Ni, K, Sc and V, probably related to clay minerals. This group is negatively correlated with Ca and Mg (the enrichment of these elements indicates carbonate source rock), but the correlation is present in soils with Ca-contents both below and above 1%. Fe is not correlated with either of the mentioned groups. Összefoglalás A Miskolci Egyetem Ásványtani-Földtani Intézete és a Rotaqua Kft. nemes- és színesfém-kutatási projektje keretében talajmintázást hajtott végre a rudabányai bányaterület külfejtéseitől EK-re. 440 talajmintát ele- meztettünk meg 35 elemre. Az eredmények alapján jelentős cink-, ólom- és rézdúsulást találtunk a Ruda-
