C3He in volatile fluxes from the solid Earth: implications for carbon geodynamics

Marty, Bernard; Jambon, Albert

doi:10.1016/0012-821x(87)90047-1

Cited by 489 publications

(229 citation statements)

References 45 publications

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“…The average value of 8.2 ± 0.2 R a is in good agreement with the results already published by van Soest et al, 1998 (7.94-7.96 R a ); Pedroni et al, 1999 (8.32-8.46 R a ) and Ruzié et al, 2012 (7.9-8.1 R a ) and evidences a MORB-type mantle source feeding the volcanic system. As classically observed in arc-related fluids (Fischer and Marty, 2005), the mean value of (CO 2 / 3 He) ratios, (11.2 ± 2.7) × 10 9 , is~5 times higher than the MORB value of (2 ± 1) × 10 9 (Marty and Jambon, 1987;Marty and Tolstikhin, 1998), due to the addition of slab-derived carbon supplied by sedimentary marine carbonate and organic matter. The mean δ 13 C value of the volcanic CO 2 , (− 3.2 ± 0.3) o / oo , is also significantly higher than the MORB value of (− 6.5 ± 2) o / oo (Javoy et al, 1986;Marty and Jambon, 1987;Sano and Marty, 1995) Pedroni et al, 1999;Ruzié et al, 2012; in black: this work).…”

Section: La Soufrière Systemsupporting

confidence: 53%

“…Fig. 4 displays the (CO 2 / 3 He) vs δ 13 C data for the summit fumaroles of La Soufrière and for the Bouillante gases in relation to the three major end-members contributing to He and CO 2 in volcanic and geothermal fluids (Sano and Marty, 1995): M represents the upper mantle endmember with (CO 2 / 3 He) M = (2 ± 1) × 10 9 (Marty and Jambon, 1987) and δ 13 C M = (− 6.5 ± 2) o / oo (Javoy et al, 1986;Marty and Jambon, 1987;Sano and Marty, 1995); L represents the sedimentary carbonate-limestone end-member with (CO 2 / 3 He) L ≈ 1 × 10 13 (Sano and Marty, 1995;Kulongoski et al, 2013) and δ 13 C L = 0 o / oo ; and S the sedimentary organic end-member with (CO 2 / 3 He) S ≈ 1 × 10 13 (Sano and Marty, 1995;Kulongoski et al, 2013) and δ 13 C S ≈ (−30 ± 10 o / oo (Hoefs, 1980;Sano and Marty, 1995). The (CO 2 / 3 He) value of most crustal CO 2 -rich continental gases is in the range 10 12 -10 14 (O'Nions and Oxburgh, 1988).…”

Section: Discussionmentioning

confidence: 99%

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Helium isotope systematics of volcanic gases and thermal waters of Guadeloupe Island, Lesser Antilles

Jean‐Baptiste

Allard

Fourré

et al. 2014

Journal of Volcanology and Geothermal Research

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The island of Guadeloupe is located in the middle of the 850 km long Lesser Antilles island arc. Present-day volcanic and geothermal activity is concentrated in two systems both located in the southwestern part of the island (Basse Terre): the La Soufrière volcanic complex and the Bouillante hydrothermal system, some 20 km to the northwest of the volcano. We report here the largest isotopic data set for helium isotopes in hydrothermal gases and waters from both systems, acquired between 1980 and 2012. 3 He/ 4 He ratios in the fumarolic gases of La Soufrière volcano have been quite homogeneous and stable over the last thirty years. The average ratio of 8.2 ± 0.2 R a confirms that the volcano is tapping a MORB-like mantle source. In contrast, the nearby Bouillante geothermal system displays a much lower 3 He/ 4 He ratio (4.5 ± 0.1 R a ). He-C elemental and isotopic relationships show that both systems are actually fed by the same magmatic source, and that their marked difference in 3 He/ 4 He results from the 4 He contamination of the Bouillante deep aquifer by the surrounding wallrock. This conclusion is strengthened by the spatial distribution of 3 He/ 4 He ratios which shows that La Soufrière fumaroles and the Bouillante geothermal system are the two end-members of a spatial trend of decreasing 3 He/ 4 He ratio with distance from La Soufrière summit dome, implying an increasing addition of radiogenic 4 He from the host rocks away from the present-day active volcanic edifice.

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Section: La Soufrière Systemsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Helium isotope systematics of volcanic gases and thermal waters of Guadeloupe Island, Lesser Antilles

Jean‐Baptiste

Allard

Fourré

et al. 2014

Journal of Volcanology and Geothermal Research

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“…Marty and Jambon, 1987;Polyak et al, 2000). The presumed presence of mantle-derived helium in fluid inclusions therefore suggests that the H 2 O-CO 2 -rich fluids infiltrating the San Andreas system may also be partially derived from the mantle.…”

Section: Mantle-derived Fluids Identified In Faulted Rocks From the Safmentioning

confidence: 99%

Isotopic evidence for the infiltration of mantle and metamorphic CO2–H2O fluids from below in faulted rocks from the San Andreas Fault system

et al. 2011

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To characterize the origin of the fluids involved in the San Andreas Fault (SAF) system, we carried out an isotope study of exhumed faulted rocks from deformation zones, vein fillings and their hosts and the fluid inclusions associated with these materials. Samples were collected from segments along the SAF system selected to provide a depth profile from upper to lower crust. In all, 75 samples from various structures and lithologies from 13 localities were analyzed for noble gas, carbon, and oxygen isotope compositions. Fluid inclusions exhibit helium isotope ratios ( 3 He/ 4 He) of 0.1-2.5 times the ratio in air, indicating that past fluids percolating through the SAF system contained mantle helium contributions of at least 35%, similar to what has been measured in present-day ground waters associated with the fault . Calcite is the predominant vein mineral and is a common accessory mineral in deformation zones. A systematic variation of C-and O-isotope compositions of carbonates from veins, deformation zones and their hosts suggests percolation by external fluids of similar compositions and origin with the amount of fluid infiltration increasing from host rocks to vein to deformation zones. The isotopic trend observed for carbonates in veins and deformation zones follows that shown by carbonates in host limestones, marbles, and other host rocks, increasing with increasing contribution of deep metamorphic crustal volatiles. At each crustal level, the composition of the infiltrating fluids is thus buffered by deeper metamorphic sources. A negative correlation between calcite δ 13 C and fluid inclusion 3 He/ 4 He is consistent with a mantle origin for a fraction of the infiltrating CO 2 . Noble gas and stable isotope systematics show consistent evidence for the involvement of mantle-derived fluids combined with infiltration of deep metamorphic H 2 O and CO 2 in faulting, supporting the involvement of deep fluids percolating through and perhaps weakening the fault zone. There is no clear evidence for a significant contribution from meteoric water, except for overprinting related to late weathering.

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“…The CO 2 / 3 He ratio can be used as a sensitive indicator of carbon provenance since the Earth's various reservoirs (crust/mantle/atmosphere) have diagnostic values [25,26]. In addition, it is an important parameter to constrain in order to calcu- late volcanic CO 2 £uxes [27].…”

Section: Co 2 / 3 Hementioning

confidence: 99%

Contrasting He–C relationships in Nicaragua and Costa Rica: insights into C cycling through subduction zones

Shaw

Hilton

Fischer

et al. 2003

Earth and Planetary Science Letters

162

160

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We report 3 He/ 4 He ratios, relative He, Ne, and CO 2 abundances as well as N 13 C values for volatiles from the volcanic output along the Costa Rica and Nicaragua segments of the Central American arc utilising fumaroles, geothermal wells, water springs and bubbling hot springs. CO 2 / 3 He ratios are relatively constant throughout Costa Rica (av. 2.1U10 10 ) and Nicaragua (av. 2.5U10 10 ) and similar to arcs worldwide (V1.5U10 10 ). N 13 C values range from 36.8x (MORB-like) to 30.1x (similar to marine carbonate (0x)). 3 He/ 4 He ratios are essentially MORBlike (8 þ 1 R A ) with some samples showing evidence of crustal He additions^water spring samples are particularly susceptible to modification. The He^CO 2 relationships are consistent with an enhanced input of slab-derived C to magma sources in Nicaragua ((L+S)/M = 16; where L, M and S represent the fraction of CO 2 derived from limestone and/or marine carbonate (L), the mantle (M) and sedimentary organic C (S) sources) relative to Costa Rica ((L+S)/ M = 10). This is consistent with prior studies showing a higher sedimentary flux to the arc volcanics in Nicaragua (as traced by Ba/La, 10 Be and La/Yb). Possible explanations include: (1) offscraping of the uppermost sediments in the Costa Rica forearc, and (2) a cooler thermal regime in the Nicaragua subduction zone, preserving a higher proportion of melt-inducing fluids to subarc depths, leading to a higher degree of sediment transfer to the subarc mantle. The absolute flux of CO 2 from the Central American arc as determined by correlation spectrometry methods (5.8U10 10 mol/yr) and CO 2 / 3 He ratios (7.1U10 10 mol/yr) represents approximately 14^18% of the amount of CO 2 input at the trench from the various slab contributors (carbonate sediments, organic C, and altered oceanic crust). Although the absolute flux is comparable to other arcs, the efficiency of CO 2 recycling through the Central American arc is surprisingly low (14^18% vs. a global average of V50%). This may be attributed to either significant C loss in the forearc region, or incomplete decarbonation of carbonate sediments at subarc depths. The implication of the latter case is that a large fraction of C (up to 86%) may be transferred to the deep mantle (depths beyond the source of arc magmas). ß

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C3He in volatile fluxes from the solid Earth: implications for carbon geodynamics

Cited by 489 publications

References 45 publications

Helium isotope systematics of volcanic gases and thermal waters of Guadeloupe Island, Lesser Antilles

Helium isotope systematics of volcanic gases and thermal waters of Guadeloupe Island, Lesser Antilles

Isotopic evidence for the infiltration of mantle and metamorphic CO2–H2O fluids from below in faulted rocks from the San Andreas Fault system

Contrasting He–C relationships in Nicaragua and Costa Rica: insights into C cycling through subduction zones

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