Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/11685
Authors: Italiano, Francesco* 
Kis, Boglarka-Mercedesz* 
Baciu, Calin* 
Ionescu, Artur* 
Harangi, Szabolcs* 
Palcsu, László* 
Title: Geochemistry of dissolved gases from the Eastern Carpathians - Transylvanian Basin boundary
Journal: Chemical Geology 
Series/Report no.: /469 (2017)
Issue Date: 2017
DOI: 10.1016/j.chemgeo.2016.12.019
Keywords: Eastern Carpathians
Dissolved gases
Gas-water interactions
Helium 13CTDIC
Subject Classificationgas geochemistry
Abstract: We show the results of a study on the volatiles dissolved inmineral waters discharged over a 200 km-long transect along the Rodna-Bârgău area and Călimani-Gurghiu-Harghita volcanic chain (Eastern Carpathians, Romania). All of the collected mineral water samples carry dissolved gas with carbon dioxide content up to 1.99 cm3STP/gH2O, and heliumcontent up to 2.3 × 10−5 cm3STP/gH2O. Carbon (δ13CTDIC total dissolved inorganic carbon, ranging from−15.6 to 5.32‰vs. VPDB), He systematics (He isotopes in the range of 0.38–0.99 Ra, Ra=air-normalized 3He/4He ratio) and CO2/3He ratio spanning over four orders ofmagnitude fromMORB-like values of 2.92× 109 to crustal-type values of 3.02 × 1013, coherently indicate the presence of fluids fromdifferent crustal sources (e.g. sediments, hydrocarbon reservoirs) besidesminor, but detectable contributions ofmantle/magmatic-derived fluids (up to 16.45%). Our investigations show that the wide range of chemical and isotopic composition can be explained in terms of mixings among different gas sources feeding the groundwater and the contemporary occurrence of gas-water interactions like degassing and deposition of carbonates, affecting the circulating waters after their infiltration.
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