Helium–carbon relationships in geothermal fluids of western Anatolia, Turkey

Mutlu, Halim; Güleç, Nilgün; Hilton, David R.

doi:10.1016/j.chemgeo.2007.10.021

Cited by 72 publications

(60 citation statements)

References 49 publications

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“…vapour-water partitioning within the geothermal system) may have caused the remarkable difference in the 3 He/ 4 He ratio between water and gas phases observed in sample SAR6, leading to a significant fractionation of the elemental ratio of helium in water. By contrast, degassing does not affect the gas phase sample (Mutlu et al 2008), leaving its 3 He/ 4 He ratio unmodified and, therefore, representative of the volatile provenance (i.e. noteworthy contribution of mantle-derived He-to CO 2 -rich hydrothermal fluids discharging in the Logudoro area, as emphasised by the 3 He/ 4 He ratio value of sample 7, Table 2).…”

Section: Origin Of Dissolved Co 2 and Thermalismmentioning

confidence: 91%

“…7 and in Table 2, for SAR6, we considered the 3 He/ 4 He ratio measured in the gas phase, as reported in Angelone et al (2005), equal to 3.04 R/Ra (Ra is the atmospheric 3 He/ 4 He ratio), instead of the same ratio measured in water (0.28 R/Ra). Indeed, as claimed by Mutlu et al (2008), hydrothermal degassing (i.e. vapour-water partitioning within the geothermal system) may have caused the remarkable difference in the 3 He/ 4 He ratio between water and gas phases observed in sample SAR6, leading to a significant fractionation of the elemental ratio of helium in water.…”

Section: Origin Of Dissolved Co 2 and Thermalismmentioning

confidence: 92%

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Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

et al. 2008

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The EC funded Geochemical Seismic Zonation program (EEC GSZ Project 1996-1998 chose Sardinia as a low-seismicity site, in which the relationships between fluid geochemistry and seismo-tectonics had to be investigated and results compared with outcomes from other selected high-seismicity sites. A first article, examining the role of fault segmentation and seismic quiescence on the geochemical composition of groundwaters and gases, has already been presented (Angelone et al. 2005). This article deals with environmental isotopes which, together with selected hydrochemical data, give hints on tectonically-related fluid circulations. Four water-dominated hydrothermal systems were considered, all located along regional fault systems and discharging groundwaters belonging to the Na-HCO 3 and Na-Cl facies. In the considered systems, groundwater circulation takes place, principally, in the Palaeozoic Crystalline Basement (PCB), with the exception of the Logudoro system, where hydrological circuits develop in the Mesozoic Carbonate Platform (MCP). The high CO 2 contents, the non-attainment of fluid-rock equilibrium and the large lithological variability prevent the construction of a unique hydrogeological-geochemical conceptual model. In this case, stable isotopes provide a useful tool to describe the origin of fluids and their subterranean movements. Stable isotopes of water, integrated with hydrochemical data, indicate that fluids are derived from three main end members. The dominant component is a relatively recent local meteoric water; the second one is marine water; and the third one is a fossil freshwater, depleted in heavy isotopes with respect to modern rains. The latter end member entered the aquifer system in the past, when climatic conditions were greatly different from today. At least two circulation systems can be recognised, namely a shallow cold system and a deep hydrothermal system, as well as two distinct hydrological processes: (1) gravity-controlled descent of cold water towards greater depths and (2) convection linked to a thermal gradient, causing deep fluids to rise up from the hydrothermal reservoir towards the surface. The highly variable d 13 C TDIC values suggest the presence of two distinct CO 2 sources, namely, a biogenic one and a thermogenic one. The relation between the isotopic compositions of CO 2 and He indicates an increased mantle signature in uprising CO 2 -rich fluids.

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Section: Origin Of Dissolved Co 2 and Thermalismmentioning

confidence: 91%

Section: Origin Of Dissolved Co 2 and Thermalismmentioning

confidence: 92%

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

et al. 2008

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“…Özellikle, Yarımadanın Güneybatısında Tuzla sahasında ölçülen R/Ra (1.44/0.80) değerleri yaklaşık olarak %18 oranındaki manto kökenli helyum oranını ifade etmektedir [18]. Su-kaya etkileşimi çerçevesinde aynı rezervuardan beslendiği düşünülen kuzeydeki Kestanbol sahası için 3 He/entalpi oranının (0.19×10 -12 cm 3 ) soğumakta olan magmatik sistemlerin 3 He/entalpi oranlarından çok daha yüksek olması, bölgedeki ısı kaynağının genişlemeli tektonik rejim ve kıtasal kabuk tabanına eklenen magmatik kütlelerin etkisi ile olabileceğini düşündürmektedir [18]. Bu verilerden hareket ile Biga Yarımadasının enerji üretme potansiyeline sahip jeotermal kaynaklarının kökensel gelişiminde magmatik etkinin baskın olduğu [19] ve bu bağlamda ülke ortalamasına göre nispeten daha yüksek bir ısı akısı ile temsil edildiği görülmektedir [19,20].…”

Section: Jeolojik Ve Jeokimyasal Sınır Koşullarunclassified

Ayvacik-Tuzla Bölgesi̇ndeki̇ Jeotermal Kaynaklardan Metal/Mi̇neral Kazanim Olanaklari

Çetiner

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZBu çalışmanın amacı Biga Yarımadası'nda ticari olarak önem atfedebilecek metal ve mineral içeren jeotermal sahaların jeolojik ve jeokimyasal sınırlarını tanımlayıp, sürdürülebilir bir geri kazanım teknolojisini özgün bir fizibilite analizi ile bütünleştirerek değerlendirmektir. Biga Yarımadası özelindeki jeotermal kaynakların fiziksel özellikleri ve kimyasal kompozisyonları incelendiğinde, yüksek sıcaklığa (T>60°C) ve nispeten asidik pH değerlerine sahip kaynakların yeterli miktarda ticari değere sahip materyali sağlayabileceği öngörülmektedir. Gerçekleştirilen pilot ölçekli fizibilite analizine göre Tuzla jeotermal sahası temel alındığında jeotermal akışkandan günde yaklaşık 22 Kg Li metali üretebileceği hesaplanmıştır. 10 yıllık bir işletme süresi göz önüne alındığında fayda-maliyet oranı (F/M) 3,71 olarak belirlenmiştir. Birden büyük olan bu oran yapılacak geri kazanım yatırımının karlı olduğunu işaret etmektedir.Anahtar Kelimeler: Jeotermal kaynaklar, metal-mineral geri kazanımı, Tuzla, lityum METAL/MINERAL RECOVERY FROM GEOTHERMAL RESOURCES IN AYVACIK-TUZLA REGION ABSTRACTThe aim of this study is to identify and analyse the prospective areas in the Biga Peninsula in terms of geothermal waters as a source of commercially valuable materials. Identified potential sources will be evaluated integrating a sample cost analysis for a pilot reclamation process. The review of the geochemistry of geothermal resources in the Biga Peninsula indicates that geothermal waters with high temperature (T>60°C) and slightly acidic pH values will yield sufficiently quantifiable dissolved commercial element concentrations. In this respect, pilot feasibility analysis showed that a geothermal fluid representing Tuzla geothermal resources could produce approximately 22 Kg Li metal per day. Benefit-cost ratio was calculated to be 3.71, showing that such an investment is profitable for a ten years of operation.

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“…Many studies have demonstrated that the characterization of the He-CO 2 relative abundances and isotopic compositions in geothermal manifestations can valuably assist in constraining the origin of the fluids (Marty and Jambon, 1987;Griesshaber et al, 1992;Lollar et al, 1997;Hulston et al, 2001;de Leeuw et al, 2007;Mutlu et al, 2008;Lollar and Ballentine, 2009;Mata et al, 2010). In this respect, because they vary by more than three orders of magnitude in terrestrial samples, helium isotopes are particularly good indicators of both the extent of mantle-derived contributions to crustal fluids and the rate of mantle degassing through the crust (Ballentine et al, 1991;Marty et al, 1992;Güleç et al, 2002;Kipfer et al, 2002 and references therein).…”

Section: Introductionmentioning

confidence: 99%

Regional variations in the chemical and helium–carbon isotope composition of geothermal fluids across Tunisia

et al. 2011

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Tunisia has numerous thermo-mineral springs. Previous studies have shown that their chemical composition and occurrence are strongly influenced by the regional geology. However little work has been done so far to study the isotopic composition of volatiles associated with these geothermal manifestations. Here, we report on the results of an extensive survey of both natural hot springs and production wells across Tunisia, aimed at investigating the spatial distribution of thermal fluids' geochemical characteristics and He-C isotopic composition. The chemistry of the analyzed samples highlights the heterogeneity of the water mineralization processes in Tunisia, as a consequence of the complex geological and tectonic setting of the country. In terms of chemical composition, we are able to conclude, however, that dissolution of halite and gypsum plays a key control on groundwater chemistry. Helium and carbon isotope systematics confirm the prevalently crustal origin of the volatiles interacting with the aquifer systems, consistent with the absence of any recent magmatism. Most samples are characterized by crustal-type helium ( He ratio reaches 2.4 Ra (corresponding to 30% of mantle-derived helium) at the Ain Garci site, a CO 2 rich mineral spring located some 30 km south of the city of Zaghouan. This mantle signature is consistent with the fact that the Pelagian Block, to which Eastern Tunisia belongs, has been deeply affected by extensional and transtensional tectonics since the opening of the Tethys, a process which is still ongoing in the Sicily channel (Pantelleria Rift). As a whole however, our results show that the Italian mantle gas anomaly only marginally extends to Northwestern Africa.

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Helium–carbon relationships in geothermal fluids of western Anatolia, Turkey

Cited by 72 publications

References 49 publications

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

Ayvacik-Tuzla Bölgesi̇ndeki̇ Jeotermal Kaynaklardan Metal/Mi̇neral Kazanim Olanaklari

Regional variations in the chemical and helium–carbon isotope composition of geothermal fluids across Tunisia

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