Skład izotopowy (U-Pb, O) cyrkonów z waryscyjskich skał magmowych w strefie uskokowej Kraków–Lubliniec i obszarach przyległych w badaniach mikrosondą jonową SHRIMP IIe/MC

In situ analyses of zircon oxygen isotope compositions integrated with U-Pb dating have been used as a tracer of igneous processes on the Małopolska and Upper Silesia Blocks in the Kraków-Lubliniec Fault Zone (KLFZ). This integration provides one of the most robust records of primary magmatic oxygen isotope ratios, making them an important archive for crustal evolution considerations. The sensitive SHRIMP IIe/MC high-resolution microprobe was used to distinguish differences in melt components related to the Carboniferous-Permian magmatism and Mo-Cu (W) mineralization. The compilation of zircon oxygen isotope ratios from several samples from the KLFZ reveals variable magmatic δ18O values, interpreted as mixing of the mantle (δ18O ~ 5.3 ±0.6%) and crustal melts (δ18O >6%), with no contamination by sediments (i.e. δ18O >10%o). There is also a systematic record of the influence of hydrothermal processes with δ18O values <4%%. These results can be potentially used as a database, presented as a map of characteristic δ18O values collected as part of the tasks of the Polish Geological Survey. The starting point for this database could be a collection of about 600 oxygen isotope analyses of zircons from 20 samples of previously dated zircons from the MB in the KLFZ, accompanied by about 260 oxygen isotope analyses from 14 samples from Variscan rocks of the Sudetic area (southern Poland).

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Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).