ABIOTIC METHANE ON EARTH
Identifieur interne : 000027 ( Main/Exploration ); précédent : 000026; suivant : 000028ABIOTIC METHANE ON EARTH
Auteurs : Giuseppe Etiope [Italie, Roumanie] ; Barbara Sherwood Lollar [Canada]Source :
- Reviews of Geophysics [ 8755-1209 ] ; 2013-04.
Descripteurs français
- Wicri :
- topic : Géochimie, Hydrocarbure, Essence, Pétrole.
English descriptors
- KwdEn :
- Abiogenic, Abiotic, Abiotic methane, Abiotic origin, Abiotic synthesis, Acta, Ballentine, Beeskow, Berndt, Biotic, Boschetti, Carbonate, Carbonate methanation, Catalytic hydrogenation, Chem, Clumped, Cosmochim, Crust, Crustal, Crystalline rocks, Earth figure, Earth planet, East rise, Eld, Etiope, Feedstock, Fractionation, Genova, Geochem, Geochemical, Geochemistry, Geochim, Geol, Geologic, Geophys, Geothermal, Giggenbach, Http, Hydrocarbon, Hydrocarbon gases, Hydrogen isotope fractionation, Hydrogen isotope signatures, Hydrogenation, Hydrogeologic, Hydrothermal, Hydrothermal conditions, Hydrothermal systems, Hyperalkaline, Igneous, Igneous rocks, Ilimaussaq, Isotope, Isotopic, Isotopic composition, Isotopic data, Isotopic fractionation, Kelley, Khibiny, Kola peninsula, Laboratory experiments, Lett, Lollar, Lovozero, Lower temperatures, Magma, Magmatic, Magmatic processes, Mantle helium, Massif, Mccollom, Metal carbides, Metamorphism, Methanation, Methane, Methanogenesis, Microbial, Natural gases, Noble gases, Ophiolite, Ophiolites, Organic matter, Petersilie, Petrol, Petroleum, Postmagmatic, Postmagmatic processes, Precambrian, Primordial, Sabatier, Schoell, Sedimentary, Sedimentary rocks, Seewald, Serpentinization, Serpentinized, Serpentinized rocks, Seyfried, Sherwood, Sherwood lollar, Songliao basin, Swir, Taran, Thermogenic, Uids, Wang, Welhan, Whiticar, Wide range.
- Teeft :
- Abiogenic, Abiotic, Abiotic methane, Abiotic origin, Abiotic synthesis, Acta, Ballentine, Beeskow, Berndt, Biotic, Boschetti, Carbonate, Carbonate methanation, Catalytic hydrogenation, Chem, Clumped, Cosmochim, Crust, Crustal, Crystalline rocks, Earth figure, Earth planet, East rise, Eld, Etiope, Feedstock, Fractionation, Genova, Geochem, Geochemical, Geochemistry, Geochim, Geol, Geologic, Geophys, Geothermal, Giggenbach, Http, Hydrocarbon, Hydrocarbon gases, Hydrogen isotope fractionation, Hydrogen isotope signatures, Hydrogenation, Hydrogeologic, Hydrothermal, Hydrothermal conditions, Hydrothermal systems, Hyperalkaline, Igneous, Igneous rocks, Ilimaussaq, Isotope, Isotopic, Isotopic composition, Isotopic data, Isotopic fractionation, Kelley, Khibiny, Kola peninsula, Laboratory experiments, Lett, Lollar, Lovozero, Lower temperatures, Magma, Magmatic, Magmatic processes, Mantle helium, Massif, Mccollom, Metal carbides, Metamorphism, Methanation, Methane, Methanogenesis, Microbial, Natural gases, Noble gases, Ophiolite, Ophiolites, Organic matter, Petersilie, Petrol, Petroleum, Postmagmatic, Postmagmatic processes, Precambrian, Primordial, Sabatier, Schoell, Sedimentary, Sedimentary rocks, Seewald, Serpentinization, Serpentinized, Serpentinized rocks, Seyfried, Sherwood, Sherwood lollar, Songliao basin, Swir, Taran, Thermogenic, Uids, Wang, Welhan, Whiticar, Wide range.
Abstract
Over the last 30 years, geochemical research has demonstrated that abiotic methane (CH4), 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) CH4. 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 CH4 in natural gases, which are frequently mixtures of multiple sources. Although it has been traditionally assumed that abiotic CH4 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 CH4 and the primary approaches for differentiating abiotic from biotic CH4, including novel potential tools such as clumped isotope geochemistry. A diagnostic approach for differentiation is proposed.
Abiotic CH4 occurs in specific geologic areas under a wide range of temperature Updated global CH4 isotopic diagram is provided Integration of geochemical‐geological data necessary to determine abiotic origin
Url:
DOI: 10.1002/rog.20011
Affiliations:
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type="ISSN">8755-1209</idno><idno type="eISSN">1944-9208</idno><imprint><biblScope unit="vol">51</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="276">276</biblScope><biblScope unit="page" to="299">299</biblScope><biblScope unit="page-count">24</biblScope><date type="published" when="2013-04">2013-04</date></imprint><idno type="ISSN">8755-1209</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">8755-1209</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abiogenic</term><term>Abiotic</term><term>Abiotic methane</term><term>Abiotic origin</term><term>Abiotic synthesis</term><term>Acta</term><term>Ballentine</term><term>Beeskow</term><term>Berndt</term><term>Biotic</term><term>Boschetti</term><term>Carbonate</term><term>Carbonate methanation</term><term>Catalytic hydrogenation</term><term>Chem</term><term>Clumped</term><term>Cosmochim</term><term>Crust</term><term>Crustal</term><term>Crystalline rocks</term><term>Earth figure</term><term>Earth planet</term><term>East rise</term><term>Eld</term><term>Etiope</term><term>Feedstock</term><term>Fractionation</term><term>Genova</term><term>Geochem</term><term>Geochemical</term><term>Geochemistry</term><term>Geochim</term><term>Geol</term><term>Geologic</term><term>Geophys</term><term>Geothermal</term><term>Giggenbach</term><term>Http</term><term>Hydrocarbon</term><term>Hydrocarbon gases</term><term>Hydrogen isotope fractionation</term><term>Hydrogen isotope signatures</term><term>Hydrogenation</term><term>Hydrogeologic</term><term>Hydrothermal</term><term>Hydrothermal conditions</term><term>Hydrothermal systems</term><term>Hyperalkaline</term><term>Igneous</term><term>Igneous rocks</term><term>Ilimaussaq</term><term>Isotope</term><term>Isotopic</term><term>Isotopic composition</term><term>Isotopic data</term><term>Isotopic fractionation</term><term>Kelley</term><term>Khibiny</term><term>Kola peninsula</term><term>Laboratory experiments</term><term>Lett</term><term>Lollar</term><term>Lovozero</term><term>Lower temperatures</term><term>Magma</term><term>Magmatic</term><term>Magmatic processes</term><term>Mantle helium</term><term>Massif</term><term>Mccollom</term><term>Metal carbides</term><term>Metamorphism</term><term>Methanation</term><term>Methane</term><term>Methanogenesis</term><term>Microbial</term><term>Natural gases</term><term>Noble gases</term><term>Ophiolite</term><term>Ophiolites</term><term>Organic matter</term><term>Petersilie</term><term>Petrol</term><term>Petroleum</term><term>Postmagmatic</term><term>Postmagmatic processes</term><term>Precambrian</term><term>Primordial</term><term>Sabatier</term><term>Schoell</term><term>Sedimentary</term><term>Sedimentary rocks</term><term>Seewald</term><term>Serpentinization</term><term>Serpentinized</term><term>Serpentinized rocks</term><term>Seyfried</term><term>Sherwood</term><term>Sherwood lollar</term><term>Songliao basin</term><term>Swir</term><term>Taran</term><term>Thermogenic</term><term>Uids</term><term>Wang</term><term>Welhan</term><term>Whiticar</term><term>Wide range</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Abiogenic</term><term>Abiotic</term><term>Abiotic methane</term><term>Abiotic origin</term><term>Abiotic synthesis</term><term>Acta</term><term>Ballentine</term><term>Beeskow</term><term>Berndt</term><term>Biotic</term><term>Boschetti</term><term>Carbonate</term><term>Carbonate methanation</term><term>Catalytic hydrogenation</term><term>Chem</term><term>Clumped</term><term>Cosmochim</term><term>Crust</term><term>Crustal</term><term>Crystalline rocks</term><term>Earth figure</term><term>Earth planet</term><term>East rise</term><term>Eld</term><term>Etiope</term><term>Feedstock</term><term>Fractionation</term><term>Genova</term><term>Geochem</term><term>Geochemical</term><term>Geochemistry</term><term>Geochim</term><term>Geol</term><term>Geologic</term><term>Geophys</term><term>Geothermal</term><term>Giggenbach</term><term>Http</term><term>Hydrocarbon</term><term>Hydrocarbon gases</term><term>Hydrogen isotope fractionation</term><term>Hydrogen isotope signatures</term><term>Hydrogenation</term><term>Hydrogeologic</term><term>Hydrothermal</term><term>Hydrothermal conditions</term><term>Hydrothermal systems</term><term>Hyperalkaline</term><term>Igneous</term><term>Igneous rocks</term><term>Ilimaussaq</term><term>Isotope</term><term>Isotopic</term><term>Isotopic composition</term><term>Isotopic data</term><term>Isotopic fractionation</term><term>Kelley</term><term>Khibiny</term><term>Kola peninsula</term><term>Laboratory experiments</term><term>Lett</term><term>Lollar</term><term>Lovozero</term><term>Lower temperatures</term><term>Magma</term><term>Magmatic</term><term>Magmatic processes</term><term>Mantle helium</term><term>Massif</term><term>Mccollom</term><term>Metal carbides</term><term>Metamorphism</term><term>Methanation</term><term>Methane</term><term>Methanogenesis</term><term>Microbial</term><term>Natural gases</term><term>Noble gases</term><term>Ophiolite</term><term>Ophiolites</term><term>Organic matter</term><term>Petersilie</term><term>Petrol</term><term>Petroleum</term><term>Postmagmatic</term><term>Postmagmatic processes</term><term>Precambrian</term><term>Primordial</term><term>Sabatier</term><term>Schoell</term><term>Sedimentary</term><term>Sedimentary rocks</term><term>Seewald</term><term>Serpentinization</term><term>Serpentinized</term><term>Serpentinized rocks</term><term>Seyfried</term><term>Sherwood</term><term>Sherwood lollar</term><term>Songliao basin</term><term>Swir</term><term>Taran</term><term>Thermogenic</term><term>Uids</term><term>Wang</term><term>Welhan</term><term>Whiticar</term><term>Wide range</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Géochimie</term><term>Hydrocarbure</term><term>Essence</term><term>Pétrole</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">Over the last 30 years, geochemical research has demonstrated that abiotic methane (CH4), 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) CH4. 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 CH4 in natural gases, which are frequently mixtures of multiple sources. Although it has been traditionally assumed that abiotic CH4 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 CH4 and the primary approaches for differentiating abiotic from biotic CH4, including novel potential tools such as clumped isotope geochemistry. A diagnostic approach for differentiation is proposed.</div><div type="abstract">Abiotic CH4 occurs in specific geologic areas under a wide range of temperature Updated global CH4 isotopic diagram is provided Integration of geochemical‐geological data necessary to determine abiotic origin</div></front></TEI><affiliations><list><country><li>Canada</li><li>Italie</li><li>Roumanie</li></country><region><li>Latium</li><li>Ontario</li></region><settlement><li>Rome</li><li>Toronto</li></settlement><orgName><li>Université de Toronto</li></orgName></list><tree><country name="Italie"><region name="Latium"><name sortKey="Etiope, Giuseppe" sort="Etiope, Giuseppe" uniqKey="Etiope G" first="Giuseppe" last="Etiope">Giuseppe Etiope</name></region><name sortKey="Etiope, Giuseppe" sort="Etiope, Giuseppe" uniqKey="Etiope G" first="Giuseppe" last="Etiope">Giuseppe Etiope</name></country><country name="Roumanie"><noRegion><name sortKey="Etiope, Giuseppe" sort="Etiope, Giuseppe" uniqKey="Etiope G" first="Giuseppe" last="Etiope">Giuseppe Etiope</name></noRegion></country><country name="Canada"><region name="Ontario"><name sortKey="Sherwood Lollar, Barbara" sort="Sherwood Lollar, Barbara" uniqKey="Sherwood Lollar B" first="Barbara" last="Sherwood Lollar">Barbara Sherwood Lollar</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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