Noble Gas Geochemistry

Ozima, M.; Podosek, F. A.

doi:10.1017/cbo9780511545986

Cited by 374 publications

(593 citation statements)

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“…7c) and increase with 4 He/ 40 Ar * . High CO 2 /noble gas ratios can occur in the residues of diffusion controlled degassing (Ozima and Podosek, 1983;Burnard, 2001) but would not produce elevated 4 He/ 40 Ar * and should be accompanied by higher δ 13 C and possibly decreased 3 He/ 4 He (Burnard et al, 2003), neither of which are observed. A more plausible explanation is that the vesicles are enriched in CO 2 .…”

Section: Evolution Of Vesicle Gasmentioning

confidence: 99%

Sources, degassing, and contamination of CO2, H2O, He, Ne, and Ar in basaltic glasses from Kolbeinsey Ridge, North Atlantic

Macpherson

Hilton

Mertz

et al. 2005

Geochimica et Cosmochimica Acta

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Section: Evolution Of Vesicle Gasmentioning

confidence: 99%

Sources, degassing, and contamination of CO2, H2O, He, Ne, and Ar in basaltic glasses from Kolbeinsey Ridge, North Atlantic

Macpherson

Hilton

Mertz

et al. 2005

Geochimica et Cosmochimica Acta

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“…where r is the ( 4 He/ 20 Ne) Air /( 4 He/ 20 Ne) measured and that of ( 4 He/ 20 Ne) Air is 0.318 (Ozima and Podosek, 1983). As far as the concentrations of trace elements (Table 2) are concerned, the highest values were measured in the Na + -Cl − waters and they were dominated by Fe, As and Ba (9620, 6170 and 3300 μg/L, respectively), followed by Mn (from 2.1 to 876 μg/L), Sb (from 1.1 to 326 μg/L), Zn (from 0.8 to 107 μg/L), Cu (from 3.4 to 48 μg/L), Ni (from 0.1 to 27 μg/L) and Co (from 0.3 to 11 μg/L).…”

Section: Chemical and Isotopic Analysis Of Dissolved And Bubbling Gasesmentioning

confidence: 99%

Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Arnold

Cabassi

Tassi

et al. 2017

Journal of Volcanology and Geothermal Research

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This study focused on the geochemical and isotopic features of thermal fluids discharged from five zones located in the high altitude Puna plateau (Jujuy Province between S 22°20′-23°20′ and W 66°-67°), i.e. Granada, Vilama, Pairique, Coranzulí and Olaroz. Partially mature waters with a Na + -Cl − composition were recognized in all the investigated zones, suggesting that a deep hydrothermal reservoir hosted within the Paleozoic crystalline basement represents the main hydrothermal fluid source. The hydrothermal reservoirs are mainly recharged by meteoric water, although based on the δ 18 O-H 2 O and δD-H 2 O values, some contribution of andesitic water cannot be completely ruled out. Regional S-oriented faulting systems, which generated a horst and graben tectonics, and NE-, NW-and WE-oriented transverse structures, likely act as preferentially uprising pathways for the deep-originated fluids, as also supported by the Rc/Ra values (up to 1.39) indicating the occurrence of significant amounts of mantle He (up to 16%). Carbon dioxide, the most abundant compound in the gas phase associated with the thermal waters, mostly originated from a crustal source, although the occurrence of CO 2 from a mantle source, contaminated by organic-rich material due to the subduction process, is also possible. Relatively small and cold Na + -HCO 3 − -type aquifers were produced by the interaction between meteoric water and Cretaceous, Palaeogene to Miocene sediments. Dissolution of evaporitic surficial deposits strongly affected the chemistry of the thermal springs in the peripheral zones of the study area. Geothermometry in the Na-K-Ca-Mg system suggested equilibrium temperatures up to 200°C for the deep aquifer, whereas lower temperatures (from 105 to 155°C) were inferred by applying the H 2 geothermometer, likely due to re-equilibrium processes during the thermal fluid uprising within relatively shallow Na-HCO 3 aquifers. The great depth of the geothermal resource (possibly N 5000 m b.g.l.) is likely preventing further studies aimed to evaluate possible exploitation, although the occurrence of Liand Ba-rich deposits associated may attract financial investments, giving a pulse for the development of this remote region.

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“…We use endmember d 15 N values for these components of 0& (Ozima and Podosek, 2002), À5 ± 2& (Marty, 1995;Cartigny et al, 1998;Sano et al, 1998;Marty and Zimmermann, 1999;Sano et al, 2001), and +7 ± 4& (Peters et al, 1978;Bebout and Fogel, 1992;Boyd and Pillinger, 1994;Bebout, 1995;Kienast, 2000;Sadofsky and Bebout, 2004;Li and Bebout, 2005) for atmosphere, upper mantle, and subducted hemipelagic sediments, respectively. An additional potential contributor of nitrogen to arc gases is the subducted altered oceanic crust; its d 15 N value, however, is currently poorly constrained but may be as low as À2.9& (Li et al, 2003).…”

Section: Gas Provenance: Resolution Into Endmembersmentioning

confidence: 99%

“…Despite the overwhelming presence of nitrogen in air, it is still possible to identify contributions from these other reservoirs because each has a distinctive chemical and isotopic nitrogen signature (Peters et al, 1978;Marty, 1995;Giggenbach, 1996;Marty and Humbert, 1997;Fischer et al, 2002;Ozima and Podosek, 2002). Nitrogen is therefore an excellent tracer of arc-related processes, as it is capable of fingerprinting gas sources and quantifying relative contributions to the volatile cycle at subduction zones Hilton et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Tracing nitrogen in volcanic and geothermal volatiles from the Nicaraguan volcanic front

Elkins

Fischer

Hilton

et al. 2006

Geochimica et Cosmochimica Acta

114

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We report new chemical and isotopic data from 26 volcanic and geothermal gases, vapor condensates, and thermal water samples, collected along the Nicaraguan volcanic front. The samples were analyzed for chemical abundances and stable isotope compositions, with a focus on nitrogen abundances and isotope ratios. These data are used to evaluate samples for volatile contributions from magma, air, air-saturated water, and the crust. Samples devoid of crustal contamination (based upon He isotope composition) but slightly contaminated by air or air-saturated water are corrected using N 2 /Ar ratios in order to obtain primary magmatic values, composed of contributions from upper mantle and subducted hemipelagic sediment on the down-going plate. Using a mantle endmember with d 15 N = À5& and N 2 /He = 100 and a subducted sediment component with d 15 N = +7& and N 2 /He = 10,500, the average sediment contribution to Nicaraguan volcanic and geothermal gases was determined to be 71%. Most of the gases were dominated by sediment-derived nitrogen, but gas from Volcán Mombacho, the southernmost sampling location, had a mantle signature (46% from subducted sediment, or 54% from the mantle) and an affinity with mantle-dominated gases discharging from Costa Rica localities to the south. High CO 2 /N 2 exc. ratios (N 2 exc. is the N 2 abundance corrected for contributions from air) in the south are similar to those in Costa Rica, and reflect the predominant mantle wedge input, whereas low ratios in the north indicate contribution by altered oceanic crust and/or preferential release of nitrogen over carbon from the subducting slab. Sediment-derived nitrogen fluxes at the Nicaraguan volcanic front, estimated by three methods, are 7.8 · 10 8 mol N/a from 3 He flux, 6.9 · 10 8 mol/a from SO 2 flux, and 2.1 · 10 8 and 1.3 · 10 9 mol/a from CO 2 fluxes calculated from 3 He and SO 2 , respectively. These flux results are higher than previous estimates for Central America, reflecting the high sediment-derived volatile contribution and the high nitrogen content of geothermal and volcanic gases in Nicaragua. The fluxes are also similar to but higher than estimated hemipelagic nitrogen inputs at the trench, suggesting addition of N from altered oceanic basement is needed to satisfy these flux estimates. The similarity of the calculated input of N via the trench to our calculated outputs suggests that little or none of the subducted nitrogen is being recycled into the deeper mantle, and that it is, instead, returned to the surface via arc volcanism.

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Noble Gas Geochemistry

Cited by 374 publications

References 0 publications

Sources, degassing, and contamination of CO2, H2O, He, Ne, and Ar in basaltic glasses from Kolbeinsey Ridge, North Atlantic

Sources, degassing, and contamination of CO2, H2O, He, Ne, and Ar in basaltic glasses from Kolbeinsey Ridge, North Atlantic

Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Tracing nitrogen in volcanic and geothermal volatiles from the Nicaraguan volcanic front

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