Nitrogen isotopes determination in natural gas: analytical method and first results on magmatic, hydrothermal and soil gas samples

Grassa, Fausto; Capasso, Giorgio; Oliveri, Ygor; Sollami, Aldo; Carreira, Paulà M.; Carvalho, Rejane Andrade de; Marques, Jorge S.; Nunes, João Carlos

doi:10.1080/10256016.2010.491914

Cited by 13 publications

(10 citation statements)

References 27 publications

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“…Helium isotopes are also corrected for atmospheric contamination. δ 15 N* = values corrected for air contamination based on N 2 / 36 Ar ratio, as proposed by Grassa et al (2010). Fig.…”

Section: Simulation Of Co 2 Dispersion In the Atmosphere And Hazard Amentioning

confidence: 99%

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Gas blowout from shallow boreholes near Fiumicino International Airport (Rome): Gas origin and hazard assessment

et al. 2015

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“…Helium isotopes are also corrected for atmospheric contamination. δ 15 N* = values corrected for air contamination based on N 2 / 36 Ar ratio, as proposed by Grassa et al (2010). Fig.…”

Section: Simulation Of Co 2 Dispersion In the Atmosphere And Hazard Amentioning

confidence: 99%

“…Typical reproducibility (1σ) for δ 13 C CH4 and δD CH4 measurements is better than 0.2‰ and 2.5‰ respectively. Nitrogen isotope composition was determined using the procedure described by Grassa et al (2010).…”

Section: Laboratory Measurementsmentioning

confidence: 99%

Gas blowout from shallow boreholes near Fiumicino International Airport (Rome): Gas origin and hazard assessment

et al. 2015

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“…δ 13 C-TDIC measurements were carried out by using a Finnigas Delta Plus XP equipped with a Thermo TRACE CG. A detailed description of the analytical system can be found in Grassa et al (2010). The analytical precision was better than 0.1‰.…”

Section: Chemical and Isotopic Analysismentioning

confidence: 99%

Water and dissolved gas geochemistry at Coatepeque, Ilopango and Chanmico volcanic lakes (El Salvador, Central America)

Cabassi

Capecchiacci

Magi

et al. 2019

Journal of Volcanology and Geothermal Research

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Coatepeque (on the E slope of Santa Ana Volcano), Ilopango (inside Ilopango Caldera) and Chanmico (associated with San Salvador Volcano) are volcanic lakes in El Salvador, showing a thermocline at a relatively shallow depth (from 30 to 40 m, from 20 to 40 m and from 5 to 15 m depth, respectively) and anoxic conditions below 33, 24 and 4 m depth, respectively. The Na +-Cl − composition of the Coatepeque and Ilopango lakes, displaying TDS values up to 1226 and 1216 mg/L, respectively, is likely due to hydrothermal fluids that feed these two lakes, as also confirmed by Cl − /Br − molar ratios ≤ 650, high As, B, Li and Si contents and Cl − /SO 4 2− ratio N 1. The Mg 2 +-HCO 3 − water composition of Lake Chanmico, whose TDS values were between 566 and 856 mg/L, suggests water-rock interaction processes with mafic/ultramafic rocks variably affected by serpentinization processes, which produced high Mg 2+ , Si and B concentrations. Waters at depth were characterized by the presence of CO 2 from an extra-lacustrine source, as suggested by δ 13 C-CO 2 values significantly less negative than those typically related to biogenic processes, albeit this gas was found in smaller quantities when compared to those recorded in other meromictic lakes hosted in quiescent volcanic systems (e.g. Lake Kivu in DRC, Monticchio, Albano and Averno lakes in Italy, Hule and Rio Cuarto lakes in Costa Rica, Lake Pavin in France). The occurrence of CH 4 , whose concentrations in Lake Chanmico were up to two orders of magnitude higher than those recorded in Coatepeque and Ilopango lakes, suggests bacterial methanogenesis.

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“…The flow rate of the carrier gas (He of 5.6 grade) was kept at a constant flux of 0.8 cc/min. The injection system, which was described in more detail by Grassa et al (), consists of a split/splitless injector with a split ratio from 10:1 to 80:1. Direct on‐column injection was performed for diluted samples with a CO 2 and/or CH 4 concentration < 0.1 mmol/mol.…”

Section: Sampling and Analytical Techniquesmentioning

confidence: 99%

Mantle Degassing Through Continental Crust Triggered by Active Faults: The Case of the Baja California Peninsula, Mexico

Cruz

Rizzo

Grassa

et al. 2019

Geochem Geophys Geosyst

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In this work, we report new chemical and isotopic data (3He/4He, δ13CCO2, δ13CCH4, and δDCH4) from poorly or previously unstudied hydrothermal and magmatic gases that are emitted along the eastern coast of the Baja California Peninsula (BCP). High 3He/4He values (up to ~7 Ra) characterize the magmatic gases, while lower ratios (≤1.6 Ra) characterize hydrothermal springs. We infer that the mantle beneath the BCP could be Mid‐ocean‐ridge basalt (MORB)‐likes, as in the rift within the Gulf of California, or it may reflect contamination from C‐rich sediment during paleo‐subduction of the Farallon plate. During their ascent, through the crust, mantle/magmatic gases mix with CO2‐ and 4He‐rich fluids, thus forming CO2‐rich hydrothermal gases. These hydrothermal gases undergo partial dissolution of CO2 in shallow waters under different temperature and pH conditions, which further modifies their composition. Thermogenic and possibly abiogenic sources of methane are present only in magmatic gases from the BCP. Secondary methane oxidation (microbial/inorganic) processes are proposed for some hydrothermal gases, which are extremely enriched in heavy isotopes. Finally, we argue that the hydrothermal gases that are emitted from the BCP have variable percentages of mantle contribution, indicating the presence of lithospheric faults enhancing the rise of mantle fluids also in areas where volcanism is absent.

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Nitrogen isotopes determination in natural gas: analytical method and first results on magmatic, hydrothermal and soil gas samples

Cited by 13 publications

References 27 publications

Gas blowout from shallow boreholes near Fiumicino International Airport (Rome): Gas origin and hazard assessment

Gas blowout from shallow boreholes near Fiumicino International Airport (Rome): Gas origin and hazard assessment

Water and dissolved gas geochemistry at Coatepeque, Ilopango and Chanmico volcanic lakes (El Salvador, Central America)

Mantle Degassing Through Continental Crust Triggered by Active Faults: The Case of the Baja California Peninsula, Mexico

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