Data for stratigraphic, granulometric, geochemical and authigenic 10Be/9Be geochronological analysis of Upper Miocene outcrops in the Turiec Basin, Western Carpathians (Central Europe)
Description
The presented data support the paper Šujan et al. (2023) Palaeogeography, Palaeoclimatology, Palaeoecology 628, 111746. It include depiction of raw borehole profiles in geological sections, sedimentological data from outcrops and specification of samples taken from the outcrops of Upper Miocene strata, present in the Turiec Basin (Western Carpathians, Central Europe). The samples underwent granulometric analysis by sieving and laser diffraction and geochemical analysis by X-ray fluorescence, ICP-ES and ICP-MS. Moreover, the samples were subject to geochronological analysis by authigenic 10Be/9Be dating, and the provided sheets include all input data, which were acquired during sample processing, ICP-MS measurements of beryllium concentrations and AMS measurements of 10Be/9Be ratios, which ultimately served for calculation of natural authigenic 10Be/9Be ratios. The concentration of beryllium, iron and manganese in the authigenic phase was analyzed by ICP-MS.
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Stratigraphy Raw borehole profiles from listed reports available at https://da.geology.sk/navigator/?desktop=Public Sedimentology The standard facies analysis of outcrops included logging and structural measurements using a geological compass. Granulometry Sieving of gravelly samples with the sieves mesh 0.25 mm, 0.5 mm, 1.0 mm, 2.5 mm, 4.0 mm, 10.0 mm, 16.0 mm, 31.0 mm and 64.0 mm. Laser diffraction grain size analysis of muddy samples using Malvern Mastersizer 3000 facility. Geochemistry Whole rocks XRF analysis (major oxides) from samples selected as representative of dating sites, and samples selected as representative of Quaternary sites, used for calibration of the authigenic 9Be/10Be initial ratio. 5 g of pulverized sample was mixed with 1 g of cellulose and pressed into pellets. XRF measurements were carried out using the ARL Quant’X (Thermo Scientific Inc., USA) EDXRF spectrometer. Excitations rays are produced by an air-cooled X-ray tube and the emitted X-rays are detected by means of a Peltier cooled Si (Li) detector, and a pulse processor. The XRF data were calibrated and matrix-corrected by Uniquant software (Ver 5.46) based on a set of fundamental parameters and unique algorithms. Certified reference materials (NSC DC73043, CRM016-50, BCR-176R and BCR-320R) were also integrated with Uniquant data processing. All the measurements were performed in vacuum. Additionally, samples from the Blažovce quarry were analyzed by ICP-ES (major oxides) and ICP-MS (trace elements). Samples were pulverized and dissolved using Lithium Borate Fusion. Enrichment factors were calculated as XEF = (Xsample/ Alsample)/(XUCC/AlUCC), and UCC following McLennan (2001). The CIA index (Nesbitt and Young, 1982) was calculated using simplification by McLennan (1993). Geochronology Samples were dried and crushed, the extraction awas applied to ~2.25 g of a sample using 0.04 M NH2OH–HCl in a 25°% acetic acid leaching solution (Bourles et al., 1989). An aliquot of ~2 ml was taken from the leached solution for measurement of 9Be, Fe, Mn and Al concentration in ICP-MS by the PlasmaQuant ICP-MS System (Analytik Jena AG). The amount of ~450 µl of beryllium standard solution was added to the remaining leached solution (Scharlau, 1000 mg/l; 10Be/9Be ratio of 7–8 × 10-15 (Merchel et al., 2021)). Beryllium was separated from other elements using column chromatography (Merchel and Herpers, 1999). The final precipitate was oxidized in an oven at 800 °C for 1 h. The resulting BeO was mixed with niobium powder and pressed into cathodes for AMS measurements at the French national AMS facility ASTER, CEREGE (Aix-en-Provence, France). The isotopic ratio measured from AMS was corrected using 1 blank for every 7 samples. The isotopic ratio of eight blanks reached values from 6.61 × 10-15 to 9.62 × 10-15. Strontium isotopes Sr isotopic data was reviewed and summarized from Pipík (2001) and Pipík et al. (2012).
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Agentúra na Podporu Výskumu a Vývoja
APVV-20-0120