Naslov
Geological investigations with dye-tracing technique and trace elements in water and sediments, Biokovo Mt (Croatia)

Autori
Matić, Natalija ; Frančišković-Bilinski, Stanislav ; Cuculić, Vlado ; Bilinski, Halka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
BALWOIS 2012 conference web-site / Morell, Marc ; Popovska, Cvetanka ; Morell, Olivija ; Stojov, Vasko - Ohrid : BALWOIS, 2012

Skup
BALWOIS 2012, Conference on water observation and information system for decision support

Mjesto i datum
Ohrid, Sjeverna Makedonija, 28.05.2012. - 02.06.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Biokovo Mt (Dalmatia; Croatia); Karstic springs; Dye-tracing technique; Trace elements in water and sediments; Mineralogy

Sažetak
Makarski Vrutak, Orašje, Grebice, Podgorski Vrutak and Izbitac are the gravity springs in the Split – Dalmatia County, Republic of Croatia. They are tapped and included in the local water supply system. Submarine spring Klokun and spring Blace are not part of the local water supply system. Inflow area of these typical karstic springs is composed of the Mesozoic carbonate rocks and minor part of Eocene age flysch deposits. Occurrences of the springs are related to the fault contacts of carbonate rocks and flysch deposits. Biokovo Mt lies in SE Europe in the North Mediterranean region, directly by the eastern Adriatic Sea coast. It is part of the geotectonic zone of the Outer Dinarides. Its relief is the result of tectonically disturbed deposits of Jurassic and Cretaceous limestones, which favoured the development of surface and underground karst features. The aim of this study was to investigate geological characteristics of this watershed with dye-tracing technique and trace elements in water and sediments, presenting one of the most typical karstic areas in the world. Ground water flow is established with dye-tracing technique. First dye-tracing was done with 3.12 kg Uranine which was poured into the pit Mala Marija on the location Lađena. Observed springs are situated on the Adriatic coast and on the slopes of the Biokovo Mt at the distance of 1.82 – 8.8 km from the Mala Marija pit. The apparent velocity of the groundwater flow for spring Orašje is 0.20 cms-1 and for Grebice is 0.48 cms-1. The second dye-tracing was done with 5.0 kg Uranine which was poured into the Saranač pit on the location Saranač. Observed springs are situated on the Adriatic coast and on the slopes of the Biokovo Mt at the distance between 6.07 and 6.96 km from the Saranač pit. There is no confirmed connection between the Saranač pit and springs Grebice, Podgorski Vrutak, Izbitac, Blace and submarine spring Klokun by ground water analysis. First dye tracing was partially effective and second dye tracing was ineffective.The reason of this ineffectivness might be due to a geological barrier, probably some immanent ore mineralization. For the first time, concentrations of 6 dissolved and total trace elements were determined in groundwater samples of this region, using voltammetry. Their concentrations were extremely low, up to three orders of magnitude lower than Croatian standards for drinking water. This supports our earlier finding that water from Biokovo Mt springs is of an extreme quality. The mass fractions of 60 elements were determined in 3 representative spring sediments. Highest measured concentrations of some heavy metals in sediments (mgkg-1) are: lead 5440, chromium 118, manganese 935, zinc 116 and barium 238. It is assumed that lead in sediments is of natural origin, as a result of ore mineralization. This could lead to conclusion that in the deeper layers of Biokovo Mt some Triassic or even Paleozoic magmatic or metamorphic rocks might be present, what would explain elevated concentrations of many metals in sediments. Indicators of mineralization in the groundwater and sediments samples suggest possible Pb-Zn ore-associations, what is supported by mineralogical analysis.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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