Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 16. 1993. (Budapest, 1993)

FRAGMENTA MINERALOGICA ET PALAEONTOLOGICA 16. BUDAPEST 1993. p. 5-26 A compilation of new major, trace element and isotope geochemical analyses of the young alkali basalts from the Pannonian Basin by A. EMBEY-ISZTIN, G. DOBOSI, D. JAMES, H. DOWNES, CH. POULTIDIS, and H. G. SCHARBERT Abstract: A great number of recent, high quality XRF major element analyses, as well as XRF, ICP and INAA trace element analyses of young alkali basalt lavas from the Pannonian Basin volcanic province are published here. Sr, Nd, Pb, O and H isotope data are also added. The compilation of data is accompanied by a short geochemical characterisation of the lava flows. INTRODUCTION Two earlier compilations of young (Plio-Pleistocene) Pannonian Basin alkali basalt analyses have been published. The first (Mauritz 1948) mainly comprises wet chemical major element analyses of H. F. HARWOOD (e.g. Mauritz & Harwood 1937). The second (Jugovics 1976) involves an important number of more recent wet chemical analyses from the Transdanubian and Nógrád occurrences as well as the analyses listed in Mauritz (1948). None of these old wet chemical analyses is repeated in the present compilation, that contains only new major element analyses using XRF techniques and trace element (XRF, ICP and INAA) as well as Sr, Nd, Pb, O and H isotope determinations on a subset of samples. The petrology, mineralogy, geochemistry, isotope geochemistry and petrogenesis of the alkali basalt lavas are discussed at length elsewhere (Embey-Isztin et al. 1993, Salters et al. 1988). A part of the analyses with details of the analytical procedures has already been published in these papers as well as in Embey-Isztin & Scharbert (1981). The analyses have been accomplished in different laboratories. Major element analyses were performed in the Petrological Department of the University of Vienna (V), Geological Department of the University of Edinburgh (E) and Manchester (M), a few in the Geochemical Laboratory of the Hungarian Academy of Sciences (G) (atomic absorption), trace element analyses in Edinburgh, Vienna, Manchester and Royal Holloway and Bedford New College (RHBNC), University of London (L). Sr, Nd and Pb isotope ratios were determined in RHBNC (L) and in the Massachusetts Institute of Technology (MIT) (Salters et al. 1988), O and H isotopes in SURRC, East Kilbride and in NIGL, Keyworth respectively. The present list attempts to cover the whole of the Pannonian Basin area. Recent, complex basin analyses have shown that in this case, it is more appropriate to speak about a basin system rather than about a unique Pannonian Basin (Royden & Horváth 1988). Different parts of the basin show highly different subsidence history, and geophysical properties such as heat flow, gravity, electric conductivity, etc. Basalt chemistry also varies from one volcanic region to another, so it can be a useful contribution to the understanding of development of different