AMEGHINO CALLE N º 5

700

A detrital zircon U-Pb study of modern sands from the lower Danube and the most important 701

four tributaries originating in the Carpathian Mountains documents the main magmatic 702

events that led to the continental crustal formation of the nearby Carpathians. The main 703

conclusions of this study are: 704

705

1- The great majority of basement was formed in latest Proterozoic – Ordovician island 706

arcs, a finding that is consistent with limited previous studies performed on the 707

basement itself; 708

709

2- A prominent Carboniferous (350-320 Ma, Variscan) magmatic peak in the detrital 710

record has no known source in the nearby Carpathians, either because it was 711

overlooked by previous basement studies or implying that lateral transport from 712

outside of the source area (and subsequent recycling) has taken place in the recent 713

geologic past. Some Variscan intrusions do exist in the Carpathians but according to 714

the current geochronologic knowledge, are small volume plutons, and cannot account 715

for such a large regional DZ peak. We cannot distinguish between these two 716

explanations at this point due to limited existing data. 717

718

3- A small proportion of unexplained igneous Eocene ages exist along the Danube and 719

tributaries; their closest exposed plausible sources are in the Rhodope Mountains well 720

to the South without a clear sedimentary pathway from source to sink in the modern 721

configuration of the river drainages. 722

723 724

Acknowledgements, Samples and Data. M.N.D. acknowledges support from US 725

National Science Foundation grant EAR 1725002 and the Romanian Executive Agency for 726

Higher Education, Research, Development and Innovation Funding project PN-III-P4-ID-PCE- 727

2016-0127. LG acknowledges support from the Ocean and Climate Change Institute of the 728

Woods Hole Oceanographic Institution. There are no financial conflicts of interests for any 729

author. The data supporting the conclusions are tabulated in the Supporting Information, 730

available with this paper. 731

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