Carbon degassing from the lithosphere

Abrajano, 1988, Methane–hydrogen gas seeps, Zambales Ophiolite, Philippines: deep or shallow origin?, Chem. Geol., 71, 211, 10.1016/0009-2541(88)90116-7 Aeschbach-Hertig, 1996, Quantification of gas fluxes from the subcontinental mantle: the example of Laacher see, a maar lake in Germany, Geochim. Cosmochim. Acta, 60, 31, 10.1016/0016-7037(95)00370-3 Agustsdottir, 1994, Volatile fluxes integrated over four decades at Grimsvotn volcano, Icel. J. Geophys. Res., 99, 9505, 10.1029/93JB03597 Al'bov, 1971, The Kerch–Taman hydrogeochemical and mud volcano region, Dokl.-Akad. Nauk SSSR, 197, 175 Allard, 1998, Magma-derived CO2 budget of Mount Etna, Eos Trans. AGU, 79 Allard, 1991, Eruptive and diffuse emissions of CO2 from Mount Etna, Nature, 351, 387, 10.1038/351387a0 Allard, 1994, Sulphur output and magma degassing budget of Stromboli volcano, Nature, 368, 326, 10.1038/368326a0 ANPA, 1999. Emissioni in atmosfera e qualità dell'aria in Italia. 1° Rapporto ANPA, Agenzia Nazionale per la Protezione dell'Ambiente, Serie Stato dell'Ambiente N. 6. Artyushkov, 1998, Steep bending of continental lithosphere without its streaching or plate collision: an indication for lithospheric failure and phase transition, Terra Nova, 10, 101, 10.1046/j.1365-3121.1998.00175.x Artyushkov, 1996, The East Carpathians: indications of phase transitions, lithospheric failure and decoupled evolution of thrust belt and its foreland, Tectonophysics, 262, 101, 10.1016/0040-1951(95)00207-3 Barberi, 1994, Helium and CO2 soil–gas emission from Santorini (Greece), Bull. Volcanol., 56, 335 Barnes, 1978, Global distribution of carbon-dioxide discharges, and major zones of seismicity, scale 1:40,000,000 Batjes, 1994, Potential emissions of radiatively active gases from soil to atmosphere with special reference to methane: development of a global database (WISE), J. Geophys. Res., 99, 16479, 10.1029/93JD03278 Baubron, 1990, Diffuse volcanic emissions of carbon dioxide from Volcano Island, Italy, Nature, 344, 51, 10.1038/344051a0 Baubron, 1991, Gas hazard on Vulcano Island, Nature, 350, 26, 10.1038/350027a0 Bergfeld, 1998, CO2 flux measurements at the Dixie Valley geothermal system, Nevada, EOS Trans. AGU, 79 Berner, 1991, A model for atmospheric CO2 over Phanerozoic time, Am. J. Sci., 291, 339, 10.2475/ajs.291.4.339 Berner, 1983, The carbonate-silicate geochemical cycle and its effects on atmospheric carbon dioxide over the past 100 million years, Am. J. Sci., 283, 641, 10.2475/ajs.283.7.641 Bickle, 1996, Metamorphic decarbonation, silicate weathering and the long-term carbon cycle, Terra Nova, 8, 270, 10.1111/j.1365-3121.1996.tb00756.x Björklund, 1990, Methane ventings as a possible mechanism for glacial plucking and fracturing of Precambrian crystalline bedrock, Geol. Foeren. Stockholm Foerh., 112, 329, 10.1080/11035899009452731 Bonan, 1995, Land–atmosphere CO2 exchange simulated by a land surface process model coupled to an atmospheric general circulation model, J. Geophys. Res., 100, 2817, 10.1029/94JD02961 Bougault, 1993, Fast and slow spreading ridges: structure and hydrothermal activity, ultramafic topographic highs, and CH4 output, J. Geophys. Res., 98, 9643, 10.1029/93JB00508 Brantley, 1995, Measured carbon dioxide emissions from Oldoinyo Lengai and the skewed distribution of passive volcanic fluxes, Geology, 23, 933, 10.1130/0091-7613(1995)023<0933:MCDEFO>2.3.CO;2 Cadle, 1980, A comparison of volcanic with other fluxes of atmospheric trace gas constituents, Rev. Geophys. Space Phys., 18, 746, 10.1029/RG018i004p00746 Carapezza, 2000, The contribution of fluid geochemistry to the volcano monitoring of Stromboli, J. Volcanol. Geotherm. Res., 95, 227, 10.1016/S0377-0273(99)00128-6 Casadevall, 1994, Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska, during the 1989–1990 eruption, J. Volcanol. Geotherm. Res., 62, 519, 10.1016/0377-0273(94)90050-7 Castro, 2000, Continuous monitoring of soil CO2 flux levels at the summit of Teide volcano, Tenerife, Canary Islands Chiodini, 1996, Diffuse emission of CO2 from the Fossa crater, Vulcano Island (Italy), Bull. Volcanol., 58, 41, 10.1007/s004450050124 Chiodini, 1998, Soil CO2 flux measurements in volcanic and geothermal areas, Appl. Geochem., 13, 543, 10.1016/S0883-2927(97)00076-0 Chiodini, 1999, Quantification of deep CO2 fluxes from Central Italy. Examples of carbon balance for regional aquifers and of soil diffuse degassing, Chem. Geol., 159, 205, 10.1016/S0009-2541(99)00030-3 Chiodini, 2000, Rate of diffuse carbon dioxide Earth degassing estimated from carbon balance of regional aquifers: the case of central Apennine, Italy, J. Geophys. Res., 105, 8423, 10.1029/1999JB900355 Christensen, 1993, Methane emission from Arctic tundra, Biogeochemistry, 21, 117, 10.1007/BF00000874 Crutzen, 1991, Methane's sinks and sources, Nature, 350, 380, 10.1038/350380a0 Delgado, 1998, CO2 flux measurements at Popocatepetl volcano: II. Magnitude of emissions and significance, EOS Trans. AGU, 79 Dong, 1998, Fluxes of CO2, CH4 and N2O from temperate forest soil: the effect of leaves and humus layers, Tellus, 50B, 243, 10.1034/j.1600-0889.1998.t01-2-00003.x Doukas, 1995, A compilation of sulfur dioxide and carbon dioxide emission-rate data from Cook Inlet volcanoes (Redoubt, Spurr, Iliama and Augustine), Alaska, during the period from 1990 to 1994, U.S. Geol. Surv. Open-File Rep., 95-55, 10.3133/ofr9555 Duchscherer, 1981, Nongasometric geochemical prospecting for hydrocarbons with case histories, Oil Gas J., Oct., 19, 312 Etiope, G., 1995. Migrazione e comportamento del “Geogas” in bacini argillosi. Ph.D. Thesis, Dept. Earth Sciences, University of Rome “La Sapienza”. Extended abstract in Plinius (1996), 15, pp. 90–94. Etiope, 1997, Migration in the ground of CO2 and other volatile contaminants. Theory and survey, 7 Etiope, 1998, Transport of radioactive and toxic matter by gas microbubbles in the ground, J. Environ. Radioact., 40, 11, 10.1016/S0265-931X(97)00068-4 Etiope, 1999, Subsoil CO2 and CH4, and their advective transfer from faulted grassland to the atmosphere, J. Geophys. Res., 104, 16889, 10.1029/1999JD900299 Etiope, 1995, Evidence for radon transport by carrier gas through faulted clays in Italy, J. Radioanal. Nucl. Chem., 193, 291, 10.1007/BF02039886 Etiope, 1996, Laboratory simulation of geogas microbubble flow, Environ. Geol., 27, 226, 10.1007/BF00770436 Etiope, 2002, Migration of carrier and trace gases in the geosphere: an overview, Phys. Earth Planet. Inter., 129, 185, 10.1016/S0031-9201(01)00292-8 Etiope, 1998, Radon in geogas microbubbles: a new perspective of earthquake precursor, J. Earthquake Predict. Res., 7, 382 Etiope, 1999, Structural pattern and CO2–CH4 degassing of Ustica Island, Southern Tyrrhenian basin, J. Volcanol. Geotherm. Res., 88, 291, 10.1016/S0377-0273(99)00010-4 Etiope, 2002, Offshore hydrocarbon leakage: hazard and monitoring, 10.1016/S0928-2009(02)80021-X Finlayson, 1968, Developments in volcanic gas research in Hawaii, vol. 12, 428 Gerlach, 1991, Etna's greenhouse pump, Nature, 315, 352, 10.1038/351352a0 Gerlach, M.T., Westrich, H.R., Symonds, R.B., 1996. Pre-eruption vapor on magma of the climatic Mount Pinatubo eruption: source of the giant stratospheric sulfur dioxide claude. In: Punongbayan, R.S., Newhall, C.G. (Eds.), Fire and Mud: Eruption and Lahars of Mount Pinatubo, Philippines. Philippine Inst. Vulcanol. Seismol., Quezon City, Univ. Washington Press, Sealttle, pp. 415–433. Gerlach, 1997, Application of the LI-COR CO2 analyzer to volcanic plumes: a case study, volcan Popocatepetl, June 7 and 10, 1995, J. Geophys. Res., 102, 8005, 10.1029/96JB03887 Gerlach, 1998, Rates of volcanic CO2 degassing from airborne determinations of SO2 emission rates and plume CO2/SO2: test study at Pu'u'O'o cone Kilauea volcano, Hawaii, Geophys. Res. Lett., 25, 2675, 10.1029/98GL02030 Giammanco, 1997, Soil CO2 degassing along tectonic structures of Mount Etna (Sicily): the Pernicana fault, Appl. Geochem., 12, 429, 10.1016/S0883-2927(97)00011-5 Giardini, 1982, The nature of the upper 400 km of the earth and its potential as the source for non-biogenic petroleum, J. Petrol. Geol., 5, 173, 10.1111/j.1747-5457.1982.tb00504.x Giggenbach, 1980, Geothermal gas equilibria, Geochim. Cosmochim. Acta, 44, 2021, 10.1016/0016-7037(80)90200-8 Giggenbach, 1991, CO2 rich gases from Lake Nyos and Monoun, Cameroon; Laacher See, Germany; Dieng, Indonesia and Mt. Gambier, Australia. Variations on a common theme, J. Volcanol. Geotherm. Res., 45, 311, 10.1016/0377-0273(91)90065-8 Giggenbach, 1993, Isotopic composition of helium, and CO2 and CH4 contents in gases produced along the New Zealand part of a convergent plate boundary, Geochim. Cosmochim. Acta, 57, 3427, 10.1016/0016-7037(93)90549-C Gold, 1979, Terrestrial sources of carbon and earthquake outgassing, J. Petrol. Geol., 1, 3, 10.1111/j.1747-5457.1979.tb00616.x Gold, 1980, The deep earth-gas hypothesis, Sci. Am., 242, 130, 10.1038/scientificamerican0680-154 Gold, 1985, Fluid ascent through the solid lithosphere and its relation to earthquakes, Pure Appl. Geophys., 122, 492, 10.1007/BF00874614 Grace, 1997, Sites of naturally elevated carbon dioxide, 1 Green, 1993, The other carbon cycle, Nature, 365, 210, 10.1038/365210a0 Greenland, 1985, An estimate of gas emissions and magmatic gas content from Kilauea volcano, Geochim. Cosmochim. Acta, 49, 125, 10.1016/0016-7037(85)90196-6 Gregori, 1995, Remote sensing of volcanoes and their role in the global climate change, Adv. Space Res., 15, 17, 10.1016/0273-1177(95)00071-L Gregory, 1985, Helium, carbon dioxide and oxygen soil gases: small-scale variations over fractured ground, J. Geochem. Explor., 24, 29, 10.1016/0375-6742(85)90003-2 Guerra, 1999, Effects of gas–water partitioning, channelling and stripping processes upon radon and helium gas distribution in fault areas, Geochem. J., 33, 141, 10.2343/geochemj.33.141 Guliyev, I.S., Feizullayev, A.A., 1997. All About Mud Volcanoes. Baku Pub. House, NAFTA Press, 120 pp. Haq, 1993, Deep-sea response to eustatic change and significance of gas hydrates for continental-margin stratigraphy, Spec. Publ. Int. Assoc. Sedimentol., 18, 93 Harris, 1981, Emission rates of CO2 from plume measurements, Prof. Pap.-U.S. Geol. Surv., 1250, 201 Hasiotis, 1996, A pockmark field in the Patras Gulf (Greece) and its activation during the 14/7/93 seismic event, Mar. Geol., 130, 333, 10.1016/0025-3227(95)00131-X Hermansson, P.H., Akerblom, G., Chyssler, J., Linden, A., 1991. Geogas—a carrier or a tracer? Statens Karnbransle Namnd (SKN) Report 51, National Board for spent nuclear fuel, Stockholm, p. 66. Hernandez, 1997, Diffuse emission of CO2 flux from Canadas Caldera, Tenerife, Canary Islands, Spain, EOS Trans. AGU, 78 Hernandez, 1998, Diffuse emission of CO2 from Miyake-jima volcano, Japan, EOS Trans. AGU, 79 Hernandez, 2000, Gas accident at Hakkoda, Japan, as a result of high diffuse CO2 emissions Hornafius, 1999, The world's most spectacular marine hydrocarbon seeps (Coal Oil Point, Santa Barbara Channel, California): quantification of emissions, J. Geophys. Res., 104, 20703, 10.1029/1999JC900148 1996 Hovland, 1993, The global flux of methane from shallow submarine sediments, Chemosphere, 26, 559, 10.1016/0045-6535(93)90442-8 Hunt, 1979 Irwin, 1980, Tectonic relations of carbon dioxide discharges and earthquakes, J. Geophys. Res., 85, 3115, 10.1029/JB085iB06p03115 Ishibashi, 1997, Hydrothermal methane and manganese variation in the plume over the superfast-spreading southern East Pacific Rise, Geochim. Cosmochim. Acta, 6, 485, 10.1016/S0016-7037(96)00304-3 Italiano, 1984, Geothermal energy and mass release at the Solfatara of Pozzuoli (Phlaegrean Fields): phreatic and phreatomagmatic explosion risk implications, Bull. Volcanol., 47, 275, 10.1007/BF01961558 Italiano, 1998, Steam output from fumaroles of an active volcano: tectonic and magmatic hydrothermal controls on the degassing system at Vulcano (Aeolian arc), J. Geophys. Res., 103, 29829, 10.1029/98JB02237 Italiano, 2000, Geochemical evidence of melt intrusions along lithospheric faults of the Southern Apennines, Italy: geodynamic and seismogenic implications, J. Geophys. Res., 105, 13569, 10.1029/2000JB900047 James, 1999, CO2 degassing in the Oregon cascades, Geology, 27, 823, 10.1130/0091-7613(1999)027<0823:CDITOC>2.3.CO;2 Judd, 1997, Contributions to atmospheric methane by natural seepages on the UK continental shelf, Mar. Geol., 137, 165, 10.1016/S0025-3227(96)00087-4 Keller, 1998, Soil respiration and georespiration distinguished by transport analyses of vadose CO2, 13CO2, and 14CO2, Global Biogeochem. Cycles, 12, 361, 10.1029/98GB00742 Kerrick, 1998, Metamorphic CO2 degassing from orogenic belts, Chem. Geol., 145, 213, 10.1016/S0009-2541(97)00144-7 Kerrick, 1995, Convective hydrothermal CO2 emission from high heat flow regions, Chem. Geol., 121, 285, 10.1016/0009-2541(94)00148-2 King, 1970, Pockmarks on the Scotian shelf, Geol. Soc. Am. Bull., 81, 3141, 10.1130/0016-7606(1970)81[3141:POTSS]2.0.CO;2 Kling, 1987, The 1986 Lake Nyos gas disaster, Cameroon, West Africa, Science, 236, 169, 10.1126/science.236.4798.169 Klinger, 1994, Carbon trace gas fluxes along a successional gradient in the Hudson Bay lowland, J. Geophys. Res., 99, 1469, 10.1029/93JD00312 Klusman, 1993 Klusman, 1998, Natural microseepage of methane to the atmosphere from the Denver–Julesburg Basin, Colorado, USA, J. Geophys. Res., 103, 28041, 10.1029/98JD02399 Klusman, 1996, Potential for use of gas flux measurements in surface exploration for geothermal resources, Trans. Geotherm. Res. Counc., 20, 331 Klusman, 1998, Does microseepage of methane and light hydrocarbons contribute to the atmospheric budget of methane and to global climate change?, Assoc. Petrol. Geochem. Explor. Bull., 11, 1 Klusman, 2000, Seasonal variation in methane fluxes from sedimentary basins to the atmosphere: results from chamber measurements and modelling of transport from deep sources, J. Geophys. Res., 105, 24661, 10.1029/2000JD900407 Koepenick, 1996, Volatile emissions from the crater and flank of Oldoinyo Lengai volcano, Tanzania, J. Geophys. Res., 101, 13819, 10.1029/96JB00173 Kutriatseva, 1974, Discovery of natural kerosene in southwestern Kamchatka, Dokl. Akad. Nauk SSSR, 216, 418 Kvenvolden, 1988, Methane hydrate: a major reservoir of carbon in the shallow geosphere?, Chem. Geol., 71, 41, 10.1016/0009-2541(88)90104-0 Le Cloarec, 1991, Volatile fluxes from volcanoes, Terra Nova, 3, 17, 10.1111/j.1365-3121.1991.tb00839.x Le Guern, 1987, Mechanism of energy transfer in the lava lake of Niragongo (Zaire), 1959–1977, J. Volcanol. Geotherm. Res., 31, 17, 10.1016/0377-0273(87)90003-5 Le Guern, 1979, Erta'Ale lava lake: heat and gas transfer to the atmosphere, J. Volcanol. Geotherm. Res., 6, 27, 10.1016/0377-0273(79)90045-3 Lesniak, 1997, Mantle helium signal in the West Carpathians, Poland, Geochem. J., 31, 383, 10.2343/geochemj.31.383 Lewicki, 2000, CO2 degassing along the San Andreas fault, Parkfield, California, Geophys. Res. Lett., 27, 5, 10.1029/1999GL008380 Loehle, 1993, Geologic methane as a source for post-glacial CO2 increases: the hydrocarbon pump hypothesis, Geophys. Res. Lett., 20, 1415, 10.1029/93GL01518 MacElvain, 1969, Mechanics of gaseous ascension through a sedimentary column, 15 Malmqvist, 1985, A physical mechanism for the release of free gases in the lithosphere, Geoexploration, 23, 447, 10.1016/0016-7142(85)90072-9 Martin, 1998, Soil CO2 flux network for volcano monitoring at El Hierro, Canary Islands, EOS Trans. AGU, 79 Martinelli, 1997, Main constraints for siting monitoring networks devoted to the study of earthquake related hydrogeochemical phenomena in Italy, Ann. Geofis., XL, 1505 Martinelli, 1991, Earthquake forerunners in a selected area of Northern Italy: recent developments in automatic geochemical monitoring, Tectonophysics, 193, 397, 10.1016/0040-1951(91)90348-V Marty, 1987, C/3He in volatile fluxes from solid Earth: implications for carbon geodynamics, Earth Planet. Sci. Lett., 83, 16, 10.1016/0012-821X(87)90047-1 Marty, 1998, Co2 fluxes from mid-ocean ridges, arcs and plumes, Chem. Geol., 145, 233, 10.1016/S0009-2541(97)00145-9 Matthews, 1987, Mantle-derived volatiles in continental crust: the Massif Central of Fance, Earth Planet. Sci. Lett., 85, 117, 10.1016/0012-821X(87)90026-4 McCarthy, 1986, A case study of soil gases as an exploration guide in glaciated terrain, Crandon massive sulfide deposit, Wisconsin, Econ. Geol., 81, 408, 10.2113/gsecongeo.81.2.408 Minissale, 1991, Thermal springs of Italy: their relation to recent tectonics, Appl. Geochem., 6, 210, 10.1016/0883-2927(91)90030-S Minissale, 1999, The origin of natural gas emissions from Sardinia island, Italy, Geochem. J., 33, 1, 10.2343/geochemj.33.1 Mörner, 1993, Methane dehydration tectonics, Bull. INQUA Neotectonics Commun., 16, 71 Mörner, 1998, New trends in global tectonics, Phys. Chem. Earth, 23, 825, 10.1016/S0079-1946(98)00095-0 Mosier, 1991, Methane and nitrous oxide fluxes in native, fertilized and cultivated grasslands, Nature, 350, 330, 10.1038/350330a0 O'Nions, 1998, Helium, volatile fluxes and the development of continental crust, Earth Planet. Sci. Lett., 90, 331, 10.1016/0012-821X(88)90134-3 Ono, 1993, Carbon isotopes of methane and carbon dioxide in hydrothermal gases in Japan, Geochem. J., 27, 287, 10.2343/geochemj.27.287 Perez, 1998, Anomalous diffuse degassing of helium-3 and CO2 related to the active Ring-Fault structure at Rabaul Caldera, Papua New Guinea, EOS Trans. AGU, 79 Perez, 2000, Diffuse/plume CO2 degassing ratio from Masaya volcano, Nicaragua, Central America Price, 1986, A critical overview and proposed working model of surface geochemical exploration, 245 Rahn, 1996, Flux chamber measurements of anomalous CO2 emission from the flanks of Mammoth Mountain, California, Geophys. Res. Lett., 23, 1861, 10.1029/96GL01864 Raich, 1992, The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate, Tellus, 44B, 81, 10.1034/j.1600-0889.1992.t01-1-00001.x Rivkina, 1998, Biogeochemical activity of anaerobic microorganisms from buried permafrost sediments, Geomicrobiology, 15, 187, 10.1080/01490459809378075 Rivkina, 1999, Methane distribution in permafrost: evidence for an interpore pressure methane hydrate Rodhe, 1996, The breathing of the Earth. Preface, Tellus, 48B, 419, 10.1034/j.1600-0889.1996.t01-3-00001.x Rogie, 1996, Contemporary non-volcanic CO2 degassing in Central Italy, EOS Trans. AGU, 77 Rogie, 1998, Continuous monitoring of diffuse CO2 degassing, Horseshoe Lake, Mammouth Mountain, California, EOS Trans. AGU, 79 Rogie, 2000, Flux measurements of nonvolcanic CO2 emission from some vents in central Italy, J. Geophys. Res., 105, 8435, 10.1029/1999JB900430 Rose, 1986, Rates of sulfur dioxide and particle emissions from White Island Volcano, New Zealand, and an estimate of total flux of major gas species, J. Volcanol., 48, 181, 10.1007/BF01087672 Salazar, 1997, Subsurface diffuse emission of carbon dioxide from Teide Volcano by means of hydrological studies, Tenerife, Canary Island, EOS Trans. AGU, 78 Salazar, 2000, Diffuse emission of CO2 from Cerro Negro volcano, Nicaragua, Central America Sano, 1996, Fluxes of mantle and subducted carbon along convergent plate boundaries, Geophys. Res. Lett., 23, 2749, 10.1029/96GL02260 Scholl, 1993, Velocity of amplitude structures on seismic-reflection profiles; possible massive gas-hydrate deposits and underlying gas accumulations in the Bering Sea, Prof. Pap.-U.S. Geol. Surv., 1970, 331 Scholl, 1995, Eocene formation of the Bering Sea Basin linked to regional-scale tectonism of Alaska—implications for energy gas resources and the accumulation of massive hydrate deposits (VAMPs), AAPG Bull., 79, 596 Seward, 1996, Hydrothermal CO2 emission from the Taupo Volcanic zone, New Zealand, Earth Planet. Sci. Lett., 139, 105, 10.1016/0012-821X(96)00011-8 Sherwood Lollar, 1997, The fate of mantle derived carbon in sedimentary basin: integration of C/He relationships and stable isotope signatures, Geochim. Cosmochim. Acta, 61, 2295, 10.1016/S0016-7037(97)00083-5 Simarski, 1992, Volcanism and climate change Simkin, 1993, Terrestrial volcanism in space and time, Annu. Rev. Earth. Planet. Sci., 21, 427, 10.1146/annurev.ea.21.050193.002235 Sjöberg, R., 1994. Bedrock caves and fractured rock surfaces in Sweden. Ph.D. thesis, P&G, Stockholm Univ. Söderberg, P., 1993. Marine geological investigations in the Åland Sea and the Stockholm archipelago, Sweden-seismic stratigraphy, tectonics and occurrence of gas related structures. Ph.D. thesis, Geol. Geochem., Stockholm Univ. Söderberg, P., Flodén, T., 1989. Geophysical and geochemical investigations related to tectonic lineaments in the archipelago of Stockholm. Investigations at Vettershaga and Stavnäs, 1984–1988. The Swedish State Power Board, Utveckling och Miljö, U(G) 1989/20, 1989-01-11 (in Swedish). Sokolov, 1969, The origin of gases and mud volcanoes and the regularities of their powerful eruptions, 473 Suess, 1995, Gas and water seepage on the continental margin: SEEPS, vol. 1, 303 Sugisaki, 1994, Mantle hydrocarbons: abiotic or biotic?, Geochim. Cosmochim. Acta, 58, 2527, 10.1016/0016-7037(94)90029-9 Symonds, 1992, Origin, speciation and fluxes of trace element gases at Augustine volcano, Alaska: insights into magma degassing and fumarolic processes, Geochim. Cosmochim. Acta, 56, 633, 10.1016/0016-7037(92)90087-Y Touret, 1992, CO2 transfer between the upper mantle and the atmosphere: temporary storage in the lower continental crust, Terra Nova, 4, 87, 10.1111/j.1365-3121.1992.tb00453.x Uchupi, 1996, Gas venting and late Quaternary sedimentation in the Persian (Arabian) Gulf, Mar. Geol., 129, 237, 10.1016/0025-3227(96)83347-0 Varekamp, 1992, Carbon sources in arc volcanism, with implications for the carbon cycle, Terra Nova, 4, 363, 10.1111/j.1365-3121.1992.tb00825.x Varhegyi, 1986, A model for the vertical subsurface radon transport in “geogas” microbubbles, Geophys. Trans., 32, 235 Vasarhelyi, 1997, Radon enriched deep earth-gas upflow in a seismically active inhabited area, 211 Wakita, 1983, 3He/4He ratios in CH4-rich natural gases suggest magmatic origin, Nature, 305, 792, 10.1038/305792a0 Wardell, 1998, Volcanic carbon dioxide emission rates: White Island, New Zealand and Mt. Erebus, Antarctica, EOS Trans. AGU, 79 Watson, 1990, Greenhouse gases and aerosols, 1 Weinlich, 1999, An active subcontinental mantle volatile system in the western Eger rift, Central Europe. Gas flux, isotopic (He, C and N) and compositional fingerprints, Geochim. Cosmochim. Acta, 63, 3653, 10.1016/S0016-7037(99)00187-8 Welhan, 1979, Methane and hydrogen in East Pacific rise hydrothermal fluids, Geophys. Res. Lett., 6, 829, 10.1029/GL006i011p00829 Werner, 2000, CO2 emissions related to the Yellowstone volcanic system: 2. Statistical sampling, total degassing and transport mechanisms, J. Geophys. Res., 105, 10831, 10.1029/1999JB900331 Wheeler, 1990, Movement of large gas bubbles in unsaturated fine-grained sediments, Mar. Geotechnol., 9, 113, 10.1080/10641199009388234 Williams, 1992, Global carbon dioxide emission to the atmosphere by volcanoes, Geochim. Cosmochim. Acta, 56, 1765, 10.1016/0016-7037(92)90243-C Zhiguan, 1991, A study on the origin of fault gases in western Yunnan, Earthquake Res. China, 5, 45 Zimov, 1993, Winter biotic activity and production of CO2 in Siberian soils: a factor in the greenhouse effect, J. Geophys. Res., 98, 5017, 10.1029/92JD02473