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You are here: Home » Latest Issue » Volume 12, 2017 - Number 2 » ISOTOPIC COMPOSITION OF PRECIPITATION IN WESTERN TRANSYLVANIA (ROMANIA) REFLECTED BY TWO LOCAL METEORIC WATER LINES


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Alexandra Iulia COZMA1, Călin BACIU1*, Delia PAPP2, Gheorghe ROȘIAN1 & Cristian-Ioan POP1
1Faculty of Environmental Science and Engineering, Babes-Bolyai University, 30 Fântânele Street, 400294, Cluj-Napoca, Romania. alexandraiuliacozma@yahoo.com, calin.baciu@ubbcluj.ro, georgerosian@yahoo.com, cristitzu@yahoo.com. *Corresponding author: Calin Baciu
2Geological Institute of Romania, Cluj-Napoca Branch, 400379 Cluj-Napoca, Romania. deliapapp@yahoo.com,

ISOTOPIC COMPOSITION OF PRECIPITATION IN WESTERN TRANSYLVANIA (ROMANIA) REFLECTED BY TWO LOCAL METEORIC WATER LINES

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Abstract:

The present study summarizes the isotopic composition of precipitation from two stations in western Romania, Rosia Montana and Cluj-Napoca. The isotopic data has been used for building the Local Meteoric Water Lines (LMWLs) for the two localities, the first situated in the Apuseni Mountains, at an elevation of about 1200 m.a.s.l, and the latter close to the western border of the Transylvanian Depression, at 360 m.a.s.l. Rainwater and snow samples from both stations have been collected on a monthly basis between August 2014 and August 2015, by following the IAEA standardized methodology. A Picarro water isotopic analyser was used for measuring the isotopic composition of water in terms of deuterium and oxygen-18 content. The equation of the LMWL for Rosia Montana is δH=7.8718O+11.72‰ (r2=0.995), while for Cluj-Napoca it is δH=8.0318O+11.29‰ (r2=0.997), with intercepts of 11.72, and 11.29 respectively. Both lines are close to the Global Meteoric Water Line, slightly above it. The features of the two lines were interpreted in terms of altitude effect, deuterium excess, and influence of temperature on δ18O. To date, there are few isotopic data from precipitation available for Romania, and the addition of two LMWLs would be useful as a reference for further studies that include an isotopic approach.


Keyword: stable isotopes, oxygen-18, deuterium, d-excess, Local Meteoric Water Line, rainfall, altitude


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