Hydrological Changes in Restricted Basins: Insights From Strontium Isotopes on Late Miocene-Pliocene Connectivity of the Eastern Paratethys (Dacian Basin, Romania)
Vasiliev, Iuliana; Stoica, Marius; Grothe, Arjen; Lazarev, Sergei; Palcu, Dan Valentin; van Baak, Christiaan; De Leeuw, Arjan; Sangiorgi, Francesca; Reichart, Gert-Jan; Davies, Gareth R.; Krijgsman, Wout
(2021) Geochemistry, Geophysics, Geosystems, volume 22, issue 7, pp. 1 - 18
(Article)
Abstract
The Dacian Basin was uniquely situated to record late Miocene hydrological changes that influenced depositional environments and faunal dispersal patterns in Central Eurasia's mega-lake Paratethys. Differences between the high strontium isotope ratio (87Sr/86Sr) of the waters from Lake Pannon and local Carpathian rivers and low 87Sr/86Sr of the Eastern Paratethys
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(Black Sea ‒ Caspian Sea) allow a thorough investigation of connectivity and water fluxes in the transient Dacian Basin. We present a detailed 87Sr/86Sr record for the Dacian Basin, which provides an exceptional record of basin connectivity from the latest Tortonian (ca. 7.7 Ma) until the early Pleistocene (ca. 1.8 Ma). Data show that a late Tortonian transgression (7.6–7.4 Ma) started with an incursion of Eastern Paratethys waters into the Dacian Basin, after which local rivers became the dominant source for the mostly freshwater environments of the early Messinian. The regional Maeotian-Pontian transitional interval (6.3–5.9 Ma) records a second incursion of Eastern Paratethys waters, but this time with an additional marine (Mediterranean) influx coinciding with a short-lived salinity incursion. During the Messinian Salinity Crisis of the Mediterranean, the Dacian Basin progressively connected with the Eastern Paratethys (5.9–5.5 Ma), after which it became restricted during the peak Mediterranean lowstand (5.5 Ma) and filled with Lake Pannon and local river water (5.5–5.3 Ma). During the Plio-Pleistocene, the Dacian Basin reconnected with the, at that time isolated, Black Sea, which shows similar 87Sr/86Sr as in the Last Glacial Maximum.
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Keywords: connectivity, Dacian Basin, marine influx, ostracods, strontium isotopes, transgression, Geophysics, Geochemistry and Petrology
ISSN: 1525-2027
Publisher: American Geophysical Union
Note: Funding Information: We thank R. Smeets, M. Klaver, L. Kootker, M. van der Ven for assistance in the strontium laboratory at the VU, Amsterdam. Further we thank L. de Nooijer, W. Boer and H. de Waard for assistance with the LA‐ICPMS measurements at the NIOZ and the UU. This work was financially supported by the Netherlands Geosciences Foundation (ALW) with support from the Netherlands Organization for Scientific Research (NWO) through the VICI grant of WK, Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) through the grant 2018/20733‐6 of DVP and the Romanian Research Council Young Research Teams (PN‐II‐RU‐TE‐2014‐4‐0050) grant of IV. Funding Information: We thank R. Smeets, M. Klaver, L. Kootker, M. van der Ven for assistance in the strontium laboratory at the VU, Amsterdam. Further we thank L. de Nooijer, W. Boer and H. de Waard for assistance with the LA-ICPMS measurements at the NIOZ and the UU. This work was financially supported by the Netherlands Geosciences Foundation (ALW) with support from the Netherlands Organization for Scientific Research (NWO) through the VICI grant of WK, Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo (FAPESP) through the grant 2018/20733-6 of DVP and the Romanian Research Council Young Research Teams (PN-II-RU-TE-2014-4-0050) grant of IV. Publisher Copyright: © 2021. The Authors.
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