Abiotic Methane in the Hyperalkaline Springs of Genova, Italy

Boschetti, Tiziano; Etiope, Giuseppe; Toscani, Lorenzo

doi:10.1016/j.proeps.2013.02.004

Cited by 36 publications

(50 citation statements)

References 8 publications

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“…While the absence of CO 2 is the norm in hyperalkaline waters, the absence of Marques et al (2008) and from a recent (2012) field work campaign H 2 is apparently unusual, since H 2 should be the primary gas produced by serpentinization. Similar observations however have been reported in ophiolitic hyperalkaline waters in Italy and Greece (Boschetti et al, 2013;Etiope et al, 2013a). The paucity of H 2 could be due to its complete consumption by CO 2 reduction in a limited or decreased H 2 production system (Etiope et al, 2013b).…”

Section: Gas Chemistry and Methane Isotopic Compositionsupporting

confidence: 80%

10th Applied Isotope Geochemistry Conference

2013

Central European Geology

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In the current work a new method to extract and analyse pore water d 2 H and d 18O from drill core samples via H 2 O (liquid) -H 2 O (vapour) equilibrium laser spectroscopy is presented. The method combines a H 2 O (liquid) -H 2 O (vapour) equilibrium cell with a Los Gatos Research (LGR) cavity ring down mass spectrometer (CRDS) and follows and adaption of the original method presented by Wassenaar et al. (2008). Sediment and rock samples taken from a research site in New South Wales, Australia were first equilibrated in a fixed volume of dehumidified air and then directly sampled by the LGR mass spectrometer. Results provide clear evidence that the technique is repeatable and can be conducted on geologic media that contain volumetric water content as low as 5%, with H 2 O (liquid) -H 2 O (vapour) equilibrium occurring over time periods as short as 120 minutes. The faster sample analysis time and lower associated consumable and instrumentation costs of the method compared to conventional techniques for pore water extraction (centrifugation, squeezing, installation of monitoring bores, etc.) and analysis therefore presents great potential for field deployment, enabling hydrogeological profiling without the need to remove drill core samples from site. (vapour) equilibrium laser spectroscopy. Environ. Sci. Technol., 42, pp. 9262-9267, 2008. 1788-2281/$20.00 © 2013 Akadémiai Kiadó, Budapest Central European Geology, Vol. 56/2-3, pp. 1-280 (2013 DOI: 10.1556/CEuGeol.56.2013 -ORIGIN OF NATURAL GAS-FED "ETERNAL FLAMES" IN THE NORTHERN APPALACHIAN BASIN, USAArndt Schimmelmann 1 -Giuseppe Etiope 2 -Agnieszka Drobniak 3 1 Department of Geological Sciences, Indiana University, Bloomington, Indiana, USA; e-mail: aschimme@indiana.edu 2 Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy, and Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania 3 Indiana Geological Survey, Indiana University, Bloomington, Indiana, USA Natural hydrocarbon gas seeps are surface expressions of petroleum seepage systems, where gas ascends through faults and conduits from pressurized reservoirs that are typically associated with conventional reservoirs in sandstones or limestones. These rare natural gas seeps provide opportunities for direct sampling of gas from subsurface hydrocarbon accumulations without the need for drilling or other costly means of petroleum exploration.We have documented a site in the northern Appalachian Basin, at Chestnut Ridge County Park, New York (Fig. 1, left), where gas seepage has supported a spectacular "eternal flame" throughout available recorded history, and which may have burnt naturally for many hundreds or even thousands of years. This remarkable flame marks a natural gas macroseep of dominantly thermogenic origin. Gas emanates directly from deep shale source rocks, probably the Rhinestreet Shale of the Upper Devonian West Falls Group, which makes this a rare case in contrast to most petroleum seepage systems where gas derives from conventional reservo...

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Section: Gas Chemistry and Methane Isotopic Compositionsupporting

confidence: 80%

10th Applied Isotope Geochemistry Conference

2013

Central European Geology

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“…In recent years there has been growing interest in the role of serpentinization of ultramafic rocks, either on land or seafloor, and abiotic synthesis of CH 4 . Abiotic CH 4 at the Earth's surface has been found to be related to low temperature (<150°C) serpentinization in ultramafic rocks such as in the submarine Lost City Hydrothermal field (LCHF) and, on land, in ophiolites or igneous intrusions in the Philippines, Oman, New Zealand, Turkey, Italy, Greece, and Japan, [e.g., Etiope et al ., and references therein; Boschetti et al ., ; Etiope et al ., ; Suda , ]. CH 4 has also been measured at other sites with active serpentinization, but the data necessary to determine the CH 4 origin are incomplete or not available.…”

Section: Natural Occurrences Of Abiotic Ch4 and Emissions Into The Atmentioning

confidence: 99%

Abiotic Methane on Earth

Etiope

Lollar

2013

Reviews of Geophysics

484

437

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[1] Over the last 30 years, geochemical research has demonstrated that abiotic methane (CH 4 ), formed by chemical reactions which do not directly involve organic matter, occurs on Earth in several specific geologic environments. It can be produced by either high-temperature magmatic processes in volcanic and geothermal areas, or via low-temperature (<100 C) gas-water-rock reactions in continental settings, even at shallow depths. The isotopic composition of C and H is a first step in distinguishing abiotic from biotic (including either microbial or thermogenic) CH 4 . Herein we demonstrate that integrated geochemical diagnostic techniques, based on molecular composition of associated gases, noble gas isotopes, mixing models, and a detailed knowledge of the geologic and hydrogeologic context are necessary to confirm the occurrence of abiotic CH 4 in natural gases, which are frequently mixtures of multiple sources. Although it has been traditionally assumed that abiotic CH 4 is mainly related to mantle-derived or magmatic processes, a new generation of data is showing that low-temperature synthesis related to gas-water-rock reactions is more common than previously thought. This paper reviews the major sources of abiotic CH 4 and the primary approaches for differentiating abiotic from biotic CH 4, including novel potential tools such as clumped isotope geochemistry. A diagnostic approach for differentiation is proposed.

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“…This could be a result of microbial consumption of these reductants, or because the dissolved hydrogen and methane may have exsolved from solution. Dissolved hydrogen and methane concentrations are comparable to those of other continental serpentinizing systems [ Abrajano et al ., ; Taran et al ., ; Etiope et al ., , , ; Boulart et al ., , ; Szponar et al ., ; Boschetti et al ., ; Cardace et al ., ].…”

Section: Aqueous Geochemistrymentioning

confidence: 99%

Geochemical bioenergetics during low‐temperature serpentinization: An example from the Samail ophiolite, Sultanate of Oman

Canovas

Hoehler

Shock

2017

J. Geophys. Res. Biogeosci.

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Various classes of microbial and biomolecular evidence from global studies in marine and continental settings are used to identify a set of reactions that appear to support microbial metabolism during serpentinization of ultramafic rocks. Geochemical data from serpentinizing ecosystems in the Samail ophiolite of Oman are used to evaluate the extent of disequilibria that can support this set of microbial metabolisms and to provide a ranking of potential metabolic energy sources in hyperalkaline fluids that are direct products of serpentinization. Results are used to construct hypotheses for how microbial metabolism may be supported in the subsurface for two cases: ecosystems hosted in rocks that have already undergone significant serpentinization and those hosted by deeper, active serpentinization processes.

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Abiotic Methane in the Hyperalkaline Springs of Genova, Italy

Cited by 36 publications

References 8 publications

10th Applied Isotope Geochemistry Conference

10th Applied Isotope Geochemistry Conference

Abiotic Methane on Earth

Geochemical bioenergetics during low‐temperature serpentinization: An example from the Samail ophiolite, Sultanate of Oman

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