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In the present study, two of the major naturally occurring radionuclides (226Ra and 222Rn) were analyzed in water samples from shallow, medium‐depth, and deep geothermal aquifers, all of which are located in Bihor County, northwestern Romania. Here, the results of radon and radium measurements, performed from 2008 to 2009 in 50 locations, are reported. Radon proved to have a wide range of activity,...
The chemical composition of the steam discharged by wells at the Cerro Prieto IV (CP IV) sector of the Cerro Prieto (Mexico) geothermal field was used to estimate important reservoir parameters such as steam fractions at the entrance of the wells (also called ‘excess steam’) and volumetric liquid saturations in the reservoir. The results were analyzed together with chemical and wellhead production...
New data on He and C isotopes in gases from Caucasus mud volcanoes located in Taman Peninsula (TP, Russia) and Kakhety District (KD, Georgia) have been produced and included in a wider metadata‐set, allowing a comparison between gas geochemistry of the two regions. In TP, the 3He/4He (R) ratios are typical of radiogenic crustal helium (R/Ratm ∼ 0.03, on average). In KD, the helium isotopic ratio R...
Widely distributed bottom simulating reflectors (BSRs) imply the potential existence of gas hydrates offshore southwestern Taiwan. To compare the distribution of methane concentrations along passive and active margins in the region, bottom waters and cored sediments were collected during four cruises from 2005 to 2006. The results reveal that sites with high methane concentrations are predominantly...
The Ecuadorian Quaternary volcanic arc is characterized by about 60 volcanoes many of which are active or potentially active. This volcanic activity is the result of the subduction processes of the Nazca Plate beneath the north‐western part of South America. The geochemical signature of the discharged fluids from these volcanic systems gives an important contribution to the comprehension of the subduction...
In the aftermath of postvolcanic activity, dry gases, containing mainly CO2, bring along radioactive gases such as radon (222Rn) and thoron (220Rn) that migrate together to the surface. Tectonic faults facilitate the upward migration of these gases. The study described here is based on measurements of radon and thoron activity concentrations performed around the mofettes and mineral springs at Harghita...
This thematic issue of Geofluids includes 11 papers representing the three main topics discussed in the 10th edition of the International Conference on Gas Geochemistry (ICGG‐10): (i) gas in petroleum systems and seepage, (ii) gas in geothermal systems and volcanoes and (iii) gas, seismicity and geohazards. ICGG‐10 was held in 2009 in Romania, a country extraordinarily rich in surface gas manifestations,...
Socorro Island is the exposed part of an approx. 4000‐m‐high volcanic edifice rising from the oceanic floor to approx. 1000 m asl at the northern part of the Mathematician Ridge, Eastern Pacific. The volcano is active, with the most recent basaltic eruption in 1993. Moderate fumarolic activity and diffuse degassing with a total CO2 flux of approx. 20 total day−1 are concentrated in the summit region...
Laboratory experiments were performed to help understand the fluctuations and the spike‐like anomalies of Rn in a time series that was recorded continuously at monitoring stations. One of the experiments indicated that Rn is adsorbed on the surface of sand particles and can be liberated with minor changes in the physical conditions of the containing medium. Another experiment indicated that the liberation...
Outbursts (releases of gas and coal from exposed coal face) are dangerous events in coal mines, potentially leading to damage in the galleries and casualties among miners. For that reason, monitoring of this hazard is very important in collieries with seams prone to outbursts. Current hazard indicators are not sufficient for the proper prediction of geodynamic events and any effort to find a new and...
Natural gas seeps in the Alpine region are poorly investigated. However, they can provide useful information regarding the hydrocarbon potential of sedimentary Alpine units and related geofluid migration, typically controlled by pressurized gas accumulations and tectonics. A gas seep located near Giswil, in the Swiss Northern Alps, was investigated, for the first time, for molecular and isotopic gas...
Gas seepage from petroleum basins is the second largest natural source of methane to the atmosphere, after wetlands. The uncertainty in global emission estimates should be reduced by extending the flux database which is fundamental for defining the emission factors and the actual area of seepage adopted for up‐scaling. As a contribution to this goal, we report a new seepage data‐set for the Transylvanian...
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