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Aim:
Freshwater
limestones (tufas and travertines) from the Pannonian Basin has been studied
for almost one hundred years. Principles, concepts and technical background
in geology have changed during the past decades, and beside the traditional
stratigraphic and microfacies descriptions, valuable information can also
be contributed to Paleoenvironmental, Paleohydrological and Paleoclimatological
studies, using stable oxygen and carbon isotope data.
In the profile of Geochemistry and Paleoclimate Research Group belong
the stable carbon and oxygen isotope geochemical, mineralogical and trace
element analyses of travertines, carbonate veins (vein-fills), carbonate
precipitation on thermal wells, and stable oxygen and hydrogen analyses
of thermal waters. For the stable isotope measurements, we use a Finnigan
MAT delta S isotope ratio mass spectrometer and a continuous-flow Finnigan
delta plus XP mass spectrometer.
Investigated areas:
1. Bükk Mts.
Detailed
petrographic, stable isotope and trace element analyses were carried out
on the recent Egerszalók travertine and associated thermal water
(De.-42. and De.-42/a wells, Bükk Mts., Hungary). The analyses focussed
mainly on the stable carbon and oxygen isotope fractionations between
water and calcite deposited at surficial conditions. Based on our observations
the morphology related outgassing, the evaporation and the bacterial activity
controlled the stable isotope composition of travertines deposited.
With the precise understanding of the stable isotope fractionation processes
and using the results gathered from the Egerszalók travertine,
it is possible to reconstruct the paleoenvironmental conditions of fossil
traverties, and more accurate paleoclimatological conclusions could be
provided.
Additionally: analyses of tufas deposited from cold ("ambient") water: pl. Sebesvíz, Szalajka-völgy.
2. Gerecse Mts.
Case study of numerous travertine occurrences: Tata (Porhanyó Quarry), Kõpite Hill, Les Hill, Dunaalmás quarries, Süttõ quarries..
3. Buda Mts.
Case study of the Monalovác Hill and Kálvária-tetõ travertines (Budakalász),..etc
Publications and abstracts can be found on the following website:
http://www.geochem.hu/people/kele_eng.html
