Fülöp Éva – Cseh Julianna szerk.: „Die aktuellen Fragen des Mittelpaläolithikums in Mitteleuropa”. „Topical issues of the research of Middle Palaeolithic period in Central Europe”. Tata, 20-23 October 2003. (Tudományos Füzetek 12. Tata, 2004)

Sándor Kele–László Korpás–Péter Kovács-Pálffy–Miklós Lantos: Sedimentology, mineralogy, lake evolution and chronology of the Quaternary Tata thermal lacustrine travertine

finally finished by eolian sedimentation. The lacustrine phases represent intensive spring activity generating relatively high water levels during the formation of the 3rd and 4th unit, while the fluvial to eolian phases are related to reduced spring activity with water level drops. Based on the different age determination methods and former studies the age of Tata travertine is approximately iooky. According to the XRD analyses the Tata travertine are composed of pure, magnesium-free calcite. On the basis of the field observations and thin section examinations numerous carbonate vents and cascades can be distinguished in the quarry, which were formed because of the former intensive spring activity. The vents are connected to each other, to the cascades and to the tetaratas. The different faciès (vent, cascade, pond) migrated during the evolution of the travertine complex due to changes in morphology and flow direction. Acknowledgements The authors are indebted to Noémi Szász for the thin sections, Kovácsné V, Katalin, Baráth Istvánné, Hózer Ferencné, Partényi Zoltánné for the laboratory work. The authors are also grateful to Kisné Cseh Julianna and the Kuny Domokos Museum (Tata) who allowed us to make field observations in the Porhanyó Quarry. Sándor Kele Institute for Geochemical Research, Hungarian Academy of Sciences, Budapest Email: keles@freemail.hu LÁSZLÓ KORPÁS, PÉTER KOVÁCS-PÁLFFY, MIKLÓS LANTOS Geological Institute of Hungary, Budapest 39