| Autor: |
Barešić, Jadranka, Sironić, Andreja, Borković, Damir, Horvatinčić, Nada, Krajcar Bronić, Ines, Faivre, Sanja, Buzjak, Nenad, Veverec, Iva |
| Přispěvatelé: |
Marjanac, Ljerka |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
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| Popis: |
Tufa deposits along the two karst rivers were dated with the aim of reconstructing palaeoenvironment and palaeoclimate settings from fresh-water carbonates. The Zrmanja river (69 km long) is located in the Dinaric karst, the NW Dalmatian plateau, and flows into the Adriatic Sea. The Krupa river is a tributary of the Zrmanja river. Both rivers are characterized by calcium carbonate precipitation in water streams forming tufa barriers. This work presents analyses of of the Zrmanja river physico-chemical parameters important for authigenic carbonate precipitation in form of tufa, as well as isotopic analyses of dissolved inorganic carbon (DIC) and fresh and old tufa deposits. Water samples were taken at 9 locations along the Zrmanja river and at 3 locations along the Krupa river including springs of both rivers and the confluence of the Krupa to the Zrmanja river. Measured values of temperature, pH, and concentrations of carbonate and calcium ions revealed conditions favourable for tufa precipitation in a downstream flow of both rivers (ISAT, saturation index of CaCO3 ≈5). Tufa does not precipitate at springs where ISAT 25, 000 BP by LSC-B method did not show satisfying concordance with results obtained by AMS technique indicating very heterogeneous precipitation of tufa deposits. Nevertheless, acceptable results obtained from 14C and U-Th dating indicate that tufa precipitated during the Holocene and the interglacial stage MIS5. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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