The Campanian Ignimbrite/Y5 tephra layer – A regional stratigraphic marker for Isotope Stage 3 deposits in the Lower Danube region, Romania

摘要: A number of volcanic ash layers embedded in Pleistocene loess and fluvial deposits the lower Jiu Olt valleys south-western Romania have been analyzed for glass chemical compositions general chronological relations. The WDS-EPMA analyses document remarkably similar major minor element at four investigated sites, total alkali–silica diagrams ascribe these ashes a phonolite to trachyte affinity. comparison with Quaternary Carpathian volcanism data refutes this field as primary source, even though earlier works tentatively taken some evidence activity particular field. Instead, suggest an origin Campi Flegrei province Italy, from proximal distal outcrops Campanian Ignimbrite/Y5 tephra confirm that presented here are occurrences widespread layer. is product one largest late explosive events Mediterranean, consistently dated elsewhere about 39–40 ka. It most important chronologic/stratigraphic markers western Eurasia provide independent basis establishing age–depth relationships embedding deposits. Optical luminescence age estimates obtained two sites further represent regionally synchronous depositional event, around 40 ka. These results highlight role could play marker horizon sub-continental scale, providing more potential locations such sedimentary Lower Danube region chemically chronologically constrained.