Data for granulometric, geochemical and authigenic 10Be/9Be geochronological analysis of Upper Miocene outcrops in the Turiec Basin, Western Carpathians (Central Europe)
Description
The presented data include 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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Granulometry Grain size of the alluvial fan and fan delta deposits was investigated by sieving of gravelly samples with the sieves of the size 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 was applied using Malvern Mastersizer 3000 facility to five muddy samples. Geochemistry Whole rocks XRF analysis (major oxides) were made from eight samples selected as representative of dating sites, and from four samples selected as representative of Quaternary sites, which were used for calibration of the authigenic 9Be/10Be initial ratio. Hence, each sample represents one studied site. 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, five 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 in an oven and crushed, the extraction procedure was 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 concentration in ICP-MS by the PlasmaQuant ICP-MS System (Analytik Jena AG). The same aliquot solution also underwent measurements of selected element concentration. 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)). Spiked samples were evaporated, and beryllium was separated from other elements using column chromatography (Merchel and Herpers, 1999). The final precipitate was oxidised in an oven at 800 °C for 1 h. The resulting BeO was mixed with niobium powder and pressed into cathodes for accelerator mass spectrometer (AMS) measurements. 10Be/9Be isotopic ratios were measured 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.