Abstract
New geochronological investigations for the Slănic Formation, correlated with previous bio- and lithostratigaphical information, allow for a better succession of events for the Middle Miocene, including the absolute age of the Badenian salinity crisis in the bend sector of the Eastern Carpathians. Within the green Slănic Tuff, white tuff layers were in evidence. The main element distribution of the white and green tuffs indicates a dacitic composition, with higher SiO2 content for the white tuff. The white tuff has a distinct mineralogical composition with quartz, plagioclase, biotite and clinoptilolite. From such a tuff layer a biotite concentrate gives a 40Ar/39Ar age of 13.7 ± 0.2 Ma. As above these tuff layers discrete levels of gypsum occur, the age documents the beginning of the restrictive circulation and formation of evaporites in this sector of Carpathians during Badenian times.
Highlights
Miocene tuffs of calc-alkaline composition are widespread in the Carpathians, Pannonian and EasternAlpine realm
Miocene tuffs have been described for the Transylvania Basin [1,2,3], the Getic basin [4], the Maramureş Basin [5,6], the Gutâi
XRD investigation of the green Slănic tuff indicates that the main mineralogical component is clinoptilolite followed by quartz and plagioclase (Figure 3A)
Summary
Miocene tuffs of calc-alkaline composition are widespread in the Carpathians, Pannonian and Eastern. Their occurrences are described in outcrops as well as in the subsurface. [7], the Apuseni Mts. Investigations have been done for the Slănic Formation in the foreland of the Eastern Carpathians [13,14]. We integrated previous bio- and lithostratigraphical information with new mineralogical, geochemical and geochronological data for the Slănic Formation, which is situated in the foreland of the Eastern Carpathians. The aim is to correlate the position of this tuff with other Miocene occurrences situated in the Carpathian area in order to get a better regional geochronological image. Carpathian events arewith correlated with of the worldwide-established biostratigraphical events.
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