Meghívó

Tisztelettel hívunk minden érdeklődőt a Litoszféra Fluidum Kutató Laboratórium (LRG) online szeminárium sorozatának keretében

Kele Sándor, ELKH CSFK, Földtani és Geokémiai Intézet tudományos főmunkatársának angol nyelvű előadsára

Things that you should know about travertines and clumped isotopes

Helyszín: ELTE Bolyai Kollégium (1117 Budapest, Nándorfejérvári út 13. room 104), továbbá Zoom közvetítés
Regisztráció (személyes és online részvétel esetén is): https://forms.gle/Kd35NiMPJt5z2Umb6
Időpont: 2022. december 12. 17.00

Minden érdeklődőt szeretettel várunk!

Abstract:

Secondary continental carbonate accumulations are quite frequent deposits in Hungary, indicating strong hydrothermal activity during the Pliocene and Quaternary. They form from CaCO3-rich waters either at ambient or at higher temperatures due to CO2 degassing and/or biological activity. Pliocene-Pleistocene travertines formed from hydrothermal fluids are characteristic for the area of the Gerecse and Buda Mts, while recent travertine accumulations form mostly at thermal wells as scalings.

Freshwater tufa carbonates in Hungary are connected to karstic springs of the the Bükk Mts, Aggtelek Mts, Mecsek Mts, Bakony Mts, Balaton-felvidék. Sedimentology, geochemistry and dating of travertine and tufa can provide important information about palaeoclimatic, tectonic and palaeoenvironmental conditions and their petrophysical and microfacies study can contribute to the understanding of microbialite oil reservoir rocks. Furthermore, the recent deposits can be used for the calibration of the oxygen- and clumped isotope paleothermometers.

The aim of this talk is to provide a short review of the most important Hungarian travertine and tufa deposits including the achievements of most recent researches focusing on their age, depositional environment and geochemistry.

Sándor Kele graduated in 2003 as a geologist at the Eötvös Loránd University, Lithosphere Fluid Research Lab (LRG) under the supervision of Csaba Szabó and Orlando Vaselli.  He continued his stable isotope studies as a Ph.D student at LRG, where he defended his thesis in 2009, titled “Investigation on freshwater limestones from the Carpathian-Basin: paleoclimatological and sedimentological studies. In 2004 Sándor spent one year at the Belgian Nuclear Research Centre as a trainee in Belgium.  He was a SCIEX postdoctoral research fellow at the ETH Zürich between 2013-2014. He was and still is a leader of OTKA projects.  Currently he is a senior research fellow at the Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network Budapest Hungary.  Sándor’s research interests are stable- and clumped isotope geochemistry of carbonates, recent travertines depositing hot spring systems, paleoclimatology (based on travertines, tufas and speleothems), geochemistry of dolomites, soil carbonates, tree rings.

Since the formation of the Lithosphere Fluid Research Laboratory (LRG) in 1998, the group led by Csaba Szabó published more than 100 peer-reviewed scientific publications, 25 PhD theses and more than 50 TDK and OTDK winning student theses. In their scientific work, the students of the LRG cover broad areas of geochemistry of the lithosphere and its fluids, such as fluid and melt inclusions in various geological environments, petrology of the lower crust and the upper mantle, geological storage of CO2 and H2, the source and fate of radon, or environmental and urban geochemistry of former industrial centers. The LRG initiated this seminar series in 2019, to invite former student of the laboratory (who are now accomplished scientists) to present their research to the next generation of geochemists.