40Ar/39Ar and U-Pb age correlations of the large Rupelian Rhodope Massif eruptions with airfall tuffs in SE, S and Central Europe

P. Marchev, Raya Raicheva, P. Filipov, Brian Jicha, R. Spikings, R. Ivanova, Olivier Bachmann, M. Guillong, Aral Okay
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Abstract

Numerous Eocene and Oligocene volcanic tuff layers within the Eastern, Central and Southern Europe sedimentary basins attest to extensive volcanic activity. Tephra dispersal of these tuffs covers areas of more than 1 000 000 km2, and the volume of erupted material to 1000s of cubic kilometers. The sources of the eruptions, however, remain unknown. Using precise 40Ar/39Ar and U-Pb radiometric dating, we correlate some of these tuff layers to three silicic Rhodope Massif Rupelian (еarly Oligocene) supereruptions dated at 33.2 Ma, 32.8 Ma and 31.6 Ma and named Dazhdovnitsa, Borovitsa and Perelik. Hence, these tuff layers can now be used as regional stratigraphic isochronous marker horizons for correlating, dating and synchronizing deposits and events in geologic and paleoenvironmental studies.
东南欧、南欧和中欧罗多彼山脉大喷发与气流凝灰岩的 40Ar/39Ar 和 U-Pb 年龄相关性研究
东欧、中欧和南欧沉积盆地中的许多始新世和渐新世火山凝灰岩层证明了广泛的火山活动。这些凝灰岩的喷发面积超过 100 万平方公里,喷发物质的体积达 1000 立方公里。然而,这些火山喷发的源头仍然未知。利用精确的 40Ar/39Ar 和 U-Pb 放射性年代测定法,我们将其中一些凝灰岩层与三个硅质罗多彼山丘鲁佩利期(渐新世早期)超级喷发相联系,其年代分别为 33.2 Ma、32.8 Ma 和 31.6 Ma,并将其命名为 Dazhdovnitsa、Borovitsa 和 Perelik。因此,这些凝灰岩层现在可以作为区域地层等时标志层,用于地质和古环境研究中沉积物和事件的关联、年代测定和同步。
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