Geochemistry of dissolved gases from the Eastern Carpathians - Transylvanian Basin boundary

Italiano, Francesco; Kis, Boglárka-Mercedesz; Baciu, Călin; Ionescu, Anda; Harangi, Szabolcs; Palcsu, László

doi:10.1016/j.chemgeo.2016.12.019

Cited by 18 publications

(14 citation statements)

References 52 publications

(68 reference statements)

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“…The same author, based on isotopic composition, suggested that the Corund North gases have a deep origin possibly due to thermometamorphism of carbonates in the subsurface. The same deep origin was also suggested for the waters in the works of Kis (2013) and Italiano (2017). Our measurements revealed that the maximum free CO2 gas flux is 458.86 g/m 2 /day supporting the CO2 rich environment.…”

Section: Discussionsupporting

confidence: 85%

See 1 more Smart Citation

Carbon Gas Flux from the Dealul Melcului Geological Resereve (Corund, Romania).

Czellecz¹,

Ionescu²,

Kis³

et al. 2018

Air and Water Components of the Environment Conference

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Carbon gas flux from the Dealul Melcului geological reserve (Corund, Romania). Recent studies have revealed the qualitative and quantitative importance of the free gas emanations from aqueous environments and from soil surfaces in Romania. Interesting mixing zones of different gases can be observed on the boundary between the Miocene sedimentary deposits and Late Miocene volcaniclastics. This study presents the results of investigations of free carbondioxide and methane made in Corund area (Harghita County), at Dealul Melcului geological reserve, where a presumed methane seepage was described in the past. Measurements were performed using a closed chamber method. Our observations and result show the lack of methane emanations, while the maximum value for carbon-dioxide emanation was 458 g/m 2 /day.

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Section: Discussionsupporting

confidence: 85%

“…The first measurements regarding the composition of the emanated gases in Corund area were performed by Vaselli et al (2002), who demonstrated the dominance of the carbon-dioxide and the presence of methane in the free gas mixture. The same can be concluded about the dissolved gases as well (Italiano et al, 2017).…”

Section: Introductionsupporting

confidence: 57%

Carbon Gas Flux from the Dealul Melcului Geological Resereve (Corund, Romania).

Czellecz¹,

Ionescu²,

Kis³

et al. 2018

Air and Water Components of the Environment Conference

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“…He isotopic ratios in the fluids collected in this study are up to 3.1 R a similar to those obtained from previous studies (Figure 4 and Table 3). These values are higher than those obtained from the surrounding areas such as in the Carpathian Foredeep and the Transylvanian Basin where He isotopic ratios are between 0.02 and 0.03 R a Italiano et al, 2017;Vaselli et al, 2002, Figure 4). These latter values are typical of crustal fluids dominated by 4 He produced by decay of U and Th (e.g., Ozima & Podosek, 2002).…”

Section: Crustal Assimilation Versus Mantle Metasomatismmentioning

confidence: 66%

“…The minimum total CO 2 flux was estimated to be 8.7 × 10 3 t/year . The aquifers of this area are represented by CO 2 -rich sparkling mineral water, with temperature up to 22.5°C (Berszán et al, 2009;Italiano et al, 2017;Jánosi et al, 2011).…”

Section: Gas Emissions and Mineral Water Springs At Ciomadul Volcanicmentioning

confidence: 99%

Noble Gas and Carbon Isotope Systematics at the Seemingly Inactive Ciomadul Volcano (Eastern‐Central Europe, Romania): Evidence for Volcanic Degassing

Kis

Caracausi

Palcsu

et al. 2019

Geochem Geophys Geosyst

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Ciomadul is the youngest volcano in the Carpathian‐Pannonian Region, Eastern‐Central Europe, which last erupted 30 ka. This volcano is considered to be inactive, however, combined evidence from petrologic and magnetotelluric data, as well as seismic tomography studies, suggests the existence of a subvolcanic crystal mush with variable melt content. The volcanic area is characterized by high CO2 gas output rate, with a minimum of 8.7 × 103 t/year. We investigated 31 gas emissions at Ciomadul to constrain the origin of the volatiles. The δ13C–CO2 and 3He/4He compositions suggest the outgassing of a significant component of mantle‐derived fluids. The He isotope signature in the outgassing fluids (up to 3.10 Ra) is lower than the values in the peridotite xenoliths of the nearby alkaline basalt volcanic field (R/Ra 5.95 Ra ± 0.01), which are representative of a continental lithospheric mantle and significantly lower than MORB values. Considering the chemical characteristics of the Ciomadul dacite, including trace element and Sr–Nd and O isotope compositions, an upper crustal contamination is less probable, whereas the primary magmas could have been derived from an enriched mantle source. The low He isotopic ratios could indicate a strongly metasomatized mantle lithosphere. This could be due to infiltration of subduction‐related fluids and postmetasomatic ingrowth of radiogenic He. The metasomatic fluids are inferred to have contained subducted carbonate material resulting in a heavier carbon isotope composition (δ13C is in the range of −1.4‰ to −4.6‰) and an increase of CO2/3He ratio. Our study shows the magmatic contribution to the emitted gases.

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“…The heat flow further increases towards the volcanic areas of the Eastern Carpathians, exceeding 120 mW m −2 , in the northern part and at the southern border of the volcanic range. Here there are no documented seeps anymore ( Figure 9) and geothermal, CO 2 -rich manifestations prevail [60]. Some of the uncertain seeps described in the old literature, however, occur within the higher thermal flux zones (Figure 10), as the northern and southern segments of the Eastern Carpathians.…”

Section: Seep Vs Heat Flowmentioning

confidence: 81%

Inventory of Onshore Hydrocarbon Seeps in Romania (HYSED-RO Database)

et al. 2017

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Abstract:Seeps are the expression of the migration of hydrocarbons from subsurface accumulations to the surface in sedimentary basins. They may represent an important indication of the presence of petroleum (gas and oil) reservoirs and faults, and are a natural source of greenhouse gas (methane) and atmospheric pollutants (ethane, propane) to the atmosphere. Romania is one of the countries with the largest number of seeps in the world, due to the high petroleum potential and active tectonics. Based on a review of the available literature, and on the field surveys performed by the authors during the last 17 years, we report the first comprehensive GIS-based inventory of 470 seeps in Romania (HYSED-RO), including gas seeps (10.4% of the total), oil seeps (11.7%), mud volcanoes (50.4%), gas-rich springs (12.6%), asphalt (solid) seeps (4.3%), unclassified manifestations (4.0%), and uncertain seeps (6.6%). Seeps are typically located in correspondence with major faults and vertical and fractured stratigraphic contacts associated to petroleum reservoirs (anticlines) in low heat flow areas, and their gas-geochemistry reflects that of the subsurface reservoirs. The largest and most active seeps occur in the Carpathian Foredeep, where they release thermogenic gas, and subordinately in the Transylvanian Basin, where gas is mainly microbial. HYSED-RO may represent a key reference for baseline characterization prior to subsurface petroleum extraction, for environmental studies, and atmospheric greenhouse gas emission estimates in Romania.

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Geochemistry of dissolved gases from the Eastern Carpathians - Transylvanian Basin boundary

Cited by 18 publications

References 52 publications

Carbon Gas Flux from the Dealul Melcului Geological Resereve (Corund, Romania).

Carbon Gas Flux from the Dealul Melcului Geological Resereve (Corund, Romania).

Noble Gas and Carbon Isotope Systematics at the Seemingly Inactive Ciomadul Volcano (Eastern‐Central Europe, Romania): Evidence for Volcanic Degassing

Inventory of Onshore Hydrocarbon Seeps in Romania (HYSED-RO Database)

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