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Geochemical Features of the Thermal and Mineral Waters from the Apuseni Mountains (Romania)

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Geochemical Features of the Thermal and Mineral Waters from the Apuseni Mountains (Romania) BRIEF RESEARCH REPORT published: 17 August 2021 doi: 10.3389/feart.2021.648179 Geochemical Features of the Thermal and Mineral Waters From the Apuseni Mountains (Romania) Alin-Marius Nicula 1, Artur Ionescu 1,2, Ioan-Cristian Pop 1, Carmen Roba 1, Ferenc L. Forray 3, Iancu Orăşeanu 4 and Călin Baciu 1* 1Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania, 2Department of Physics and Geology, University of Perugia, Perugia, Italy, 3Department of Geology, Babeş-Bolyai University, Cluj-Napoca, Romania, 4Romanian Association of Hydrogeologists, Bucuresti, Romania The Apuseni Mountains are located between the large geothermal area of the Pannonian Basin and the low thermal flux Transylvanian Basin. Thermal and mineral waters have been sampled from 42 points along a NW-SE transect. The general chemistry and the water isotope (deuterium and oxygen-18) composition were analyzed. Most of the thermal aquifers are located in carbonate reservoirs. The waters mainly belong to the Ca-HCO3 hydrochemical type, excepting the western side, towards the Pannonian Basin, where the Edited by: Na-HCO3 type may occur. The isotope composition indicates aquifer recharge from Giovanni Martinelli, precipitation. The geochemical characteristics and the structural position of the study area National Institute of Geophysics and suggest two distinct geothermal contexts. The Southern Apuseni area geothermal features Volcanology, Italy — ş Reviewed by: are likely connected to the Neogene Early Quaternary magmatic activity from the Mure Giovanni Vespasiano, Valley and Zarand Depression. The geothermal manifestations in the north-western part of University of Calabria, Italy the study area, at the border between the Northern Apuseni and the Pannonian Tamara Marković, Croatian Geological Survey, Croatia Depression, share features of the latter one. Nina Rman, Keywords: geothermal, mineral water, hydrogeochemistry, water isotopes, geothermometer, Apuseni Mts, Geological Survey Ljubljana, Slovenia Romania *Correspondence: Călin Baciu [email protected] INTRODUCTION Specialty section: This article was submitted to The mineral and thermal waters from the Apuseni Mountains have been less studied by respect to Geochemistry, other areas in Romania, although their resources are not negligible. Some of the thermal sources, as a section of the journal Geoagiu (Germisara) and Călan (Ad Aquas), are known since the Roman times (Fodorean, 2012). Frontiers in Earth Science However, the geochemical information able to deepen our understanding on the geothermal Received: 31 December 2020 potential and the genesis of the thermal and mineral waters in the Apuseni area are scarce. Accepted: 05 August 2021 The Apuseni Mountains are bordered towards the west by the Romanian part of the Pannonian Published: 17 August 2021 Basin, an extensive unit well known for its rich geothermal resources (e.g.,: Horvath et al., 2006; Szocs Citation: et al., 2018; Rman et al., 2019). On the opposite side, the Transylvanian Basin is recognized as having Nicula A-M, Ionescu A, Pop I-C, low heat flow compared to the Pannonian Basin, but comparable values to other European areas Roba C, Forray FL, Orăşeanu I and (Demetrescu and Andreescu, 1994; Tiliţă et al., 2018). Baciu C (2021) Geochemical Features Information about the mineral and thermal waters from the Apuseni Mts. is available in general of the Thermal and Mineral Waters ş From the Apuseni works regarding the Romanian mineral waters (e.g.,: Institutul de Balneologie i Fizioterapie (IBF), ă ° Mountains (Romania). 1970; Pricajan, 1972; Pric jan and Airinei, 1981). Groundwater with temperatures higher than 20 C Front. Earth Sci. 9:648179. is generally considered as thermal water. A series of relevant contributions to the hydrogeological doi: 10.3389/feart.2021.648179 description of the Apuseni Mts., especially of the karst areas, were authored by Orăşeanu, here Frontiers in Earth Science | www.frontiersin.org 1 August 2021 | Volume 9 | Article 648179 Nicula et al. Thermal and Mineral Waters Apuseni including also mineral and thermal waters (e.g., Orăşeanu, 1987; metamorphic rocks. The Biharia nappe system belongs to the Orăşeanu and Mather, 2000), and synthesized by Orăşeanu Dacia mega-unit, as an equivalent of the Supragetic nappe system (2016, 2020). The thermal waters are used or have been used from the Southern Carpathians (Schmid et al., 2008, 2020), and for bathing purposes in resorts as Băile Felix, Geoagiu, Moneasa, overthrusts the Bihor and Codru units. Vaţa, Călan. Carbonated waters are bottled in Boholt, Băcâia, and The South Apuseni segment is the remnant of a branch of Chimindia. Neotethys, the Eastern Vardar mobile area. It mainly consists of The present contribution aims to extend the current ophiolitic units, placed over the margin of the Dacia block during knowledge on the occurrence and characteristics of the the Upper Jurassic (Schmid et al., 2008). They are the result of an mineral and thermal waters in the Apuseni Mts. area, by intra-oceanic back-arc basin that persisted a very short period, adding a set of hydrogeochemical data that includes chemical between the Middle Jurassic and Late Kimmeridgian to and isotopic analyses. These results will help in better Tithonian. The closure of the basin is marked by the constraining the thermal features of the study region. Water obduction of the ophiolitic units on the Biharia nappe system samples from 42 locations along a NW-SE transect were collected. (Schmid et al., 2020). The ophiolitc complex is represented by Groundwater sources with temperatures between 10 and 20°C, Middle Jurassic tholeites and Late Jurassic to Early Cretaceous although not corresponding to the definition of thermal water, calc-alkaline magmatic rocks (Mutihac, 1990). An intensive Late were included in this study as indicators of the geothermal Jurassic to Late Cretaceous sedimentation has accompanied and influence. The analytical results are interpreted by geochemical followed the ophiolitic magmatism. Two types of sediments methods, and an assessment of the origin and geothermal context dominate: the reef limestone (Malm to Lower Cretaceous), and of the investigated waters is presented, correlated with the flysch-type detrital units. geological setting of the study area. THE STUDY AREA GEOLOGICAL SETTING Two distinct areas have been considered within the study region, The Apuseni Mountains represent a segment of the Carpathian which show different geological, hydrogeological, and structural orogen, with an inner position relative to the main ridge. They are features. The southern area corresponds to the depression located between two connected Neogene sedimentary basins, the between the Apuseni Mts. and the Southern Carpathians, filled Pannonian Basin to the west, and the Transylvanian Basin to the with Neogene-Quaternary deposits along the Mureş and Strei east. Although the Apuseni Mts. have the appearance of an island, Rivers, and to the southern part of the Apuseni Mountains. The their structure continues beneath the sediments of the two basins. northern area corresponds to the Northern Apuseni structural The basement of the Pannonian Basin consists of two entities units, including also the Neogene depressions on the western side with different origin and evolution, the ALCAPA and Tisza/Tisia of the mountain range (Figure 1). mega-units, separated by the Mid Hungarian fault zone (Schmid Within the southern area (A), two distinct subareas have been et al., 2020). The ALCAPA block, originated from the Adria investigated. Rapolt subarea corresponds to the crystalline realm, comprises the Austroalpine unit of the Alps and internal isolated massif of Rapolt and its surroundings, extending units of the Western Carpathians. A significant part of it, southward along Strei River. Its southern part is represented representing the basement of the north-western part of the by a flat area filled with Neogene-Quaternary sediments. The Pannonian Basin, is covered by Neogene sediments. Tisza northern part includes the Rapolt crystalline body, the Măgura mega-unit is a Europe-derived block, which forms the Uroiului shoshonitic body (Seghedi et al., 2011), and the basement of the south-eastern side of the Pannonian Basin, surrounding sedimentary areas that host geothermal sources. being visible in the Mecsek Mts. in Hungary, or the Slavonian The following sources have been investigated within this Hills in Croatia. The largest outcropping area of the Tisia block subarea: Călan, Chimindia, Banpotoc, Rapolţel, Feredee, corresponds to the Northern Apuseni Mts. (Inner Dacides, after Rovina, Nătău, Geoagiu. Săndulescu, 1984), where the upper two units of this block, the Zarand subarea (B) corresponds to a NW-SE oriented Bihor and Codru nappe systems are exposed. These units depression along Crişul Alb River, within the Southern generally consist of an Early Proterozoic—Variscan basement, Apuseni Mts, narrower in the SE (Brad area), and extending basement-cover and pre-Alpine cover nappes (Seghedi, 2004). gradually to the Pannonian Basin. This intramountainous area is The Bihor unit consists of medium-grade crystalline rocks, filled with Neogene sediments penetrated by Neogene magmatic with granitic intrusions, covered by Permian—Mesozoic detrital bodies (Pécskay et al., 1995; Roşu et al., 1997; Roşu et al., 2004; and carbonate sedimentary formations (Săndulescu, 1984). The Seghedi and Downes, 2011). The investigated sources in Zarand lithologic composition of the Codru unit is dominated
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