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Holocene environmental changes and sediment source based on clay minerals and geochemistry in Baćina lakes and Vrgoračko polje (CROSBI ID 625082)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Ilijanić, Nikolina ; Miko, Slobodan ; Hasan, Ozren ; Bakrač, Koraljka Holocene environmental changes and sediment source based on clay minerals and geochemistry in Baćina lakes and Vrgoračko polje // Abstracts and Excursion Guidebook 4th Scientific meeting Quaternary Geology in Croatia and Slovenia / Marjanac, Ljerka (ur.). Zagreb: Hrvatska akademija znanosti i umjetnosti (HAZU), 2015. str. 18-18

Podaci o odgovornosti

Ilijanić, Nikolina ; Miko, Slobodan ; Hasan, Ozren ; Bakrač, Koraljka

engleski

Holocene environmental changes and sediment source based on clay minerals and geochemistry in Baćina lakes and Vrgoračko polje

Holocene sediments from the Baćina lakes on the Eastern Adriatic coast have been investigated using sedimentological, mineralogical, clay minerals, rock magnetic and geochemical methods. The Baćina lakes are located in southern Dalmatia, near the town Ploče, north- west from the river Neretva delta, and consist of six connected and one separate lake. They are relatively small freshwater lakes (total surface is 1.4 km2), but are among the most interesting phenomena in karst hydrology. The shape of the lakes is irregular, which is reflected in the lake bottom relief, and there are also three small islands on the lakes. Lake sediments can be seen around the lakes, which prove their different shape and water level in the past. There are two tunnels in the lakes, the first connects the lake Podgora to the Vrgoračko polje (2 km long), for the drainage of excess water from polje, and another connects the lake Sladinac to the sea, to prevent flooding and allow agriculture. The 8, 4 m core from the deepest lake, Lake Crniševo, showed the peaceful environment, not disturbed by the anthropogenic pollution caused by intensive agriculture developed around the lakes after the construction of the tunnel that connects them to the sea, while in the lake where the tunnel is (Podgora), show higher values of Cu and Pb in the upper 30 cm. The age of the core in Crniševo dates back to the beginning of the Holocene (8.3 m is around 11.700 cal BP). In that period Lake Crniševo existed as shallower lake than today, with the higher concentrations of the lithogenic elements and magnetic susceptibility, which indicate increased erosion and input of the siliciclastic material from the catchment from 11.7 to 10 cal ka BP, and then gradually decrease until 7.5 cal ka BP. Dominant carbonate deposition lasted from 7.5 until 4.5 cal ka BP. Typical Mediterranean vegetation was determined from the 7.5 cal ka BP. At 4.5 cal ka BP intensive changes in the sediments began, observed by the high sand fraction compared to silt that was dominant until this period. This dynamic environment lasted until 2.5 cal ka BP, and in between the alternate intervals with calcite and quartz and those in which only calcite is present, were developed. From that time (4.5 cal ka BP) the slow increasing of the siliciclastic material were observed, indicating the increasing human impact and deforestation of the catchment. Tephra was identified by the very high magnetic susceptibility and other magnetic properties, so as higher elements K, Na, Mg, Zr in the overall chemical composition of the sediments. Given the age of the sediments at depths of 456 and 505 cm where the tephra is obtained, using a depth/age model, it is assumed that tephra belongs to Agnano Astroni Monte Spino (AMST), the eruption of the Phlegraean fields around 4400 cal BP. In Lake Crniševo, the lake sediments show the same signature as the soils in the catchment, hydroxyl interlayered vermiculite (HIV), kaolinite and illite, and lack of association from the sediments in Vrgoračko polje, which can be seen in the upper and bottom sediments from the Lake Podgora. These are valuable results based on clay minerals that evidence the influence of the sediments from Vrgoračko polje in Baćina lakes in recent period after the tunnel has been built and in the past through sinkholes.

Holocene; lake sediments; clay minerals; anthropogene infulence

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Podaci o prilogu

18-18.

2015.

objavljeno

Podaci o matičnoj publikaciji

Abstracts and Excursion Guidebook 4th Scientific meeting Quaternary Geology in Croatia and Slovenia

Marjanac, Ljerka

Zagreb: Hrvatska akademija znanosti i umjetnosti (HAZU)

Podaci o skupu

Quaternary Geology in Croatia and Slovenia

predavanje

25.03.2015-25.03.2015

Zagreb, Hrvatska

Povezanost rada

Geologija