Melting and metasomatism in West Eifel and Siebengebirge Sub-Continental Lithospheric Mantle: Evidence from concentrations of volatiles in fluid inclusions and petrology of ultramafic xenoliths

Rizzo, Andrea Luca; Faccini, Barbara; Casetta, Federico; Faccincani, Luca; Ntaflos, Theodoros; Italiano, Francesco; Coltorti, Massimo

doi:10.1016/j.chemgeo.2021.120400

Cited by 12 publications

(19 citation statements)

References 118 publications

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“…The selected crystals were finally weighted (0.1-1.5 g) and loaded into a stainlesssteel crusher. Further details on the protocol of rock and mineral preparation can be found in Rizzo et al [49,78,79].…”

Section: Samples and Methodsmentioning

confidence: 99%

“…Mid Ocean Ridge Basalt (MORB) range of 3 He/ 4 He is from [87]. The pink dashed line represents the path of diffusive fractionation due to helium loss from the crystals, taking into account the diffusion coefficient (D) of 3 He and 4 He (D 3He /D 4He = 1.15 in solid mantle; see [79] for more details). Starting magmatic composition is: 4 He = 3 × 10 −13 mol/g and 3 He/ 4 He = 8.0 Ra.…”

Section: Isotope Composition Of Noble Gases In Fluid Inclusionsmentioning

confidence: 99%

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3He/4He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc

et al. 2022

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Constraining the magmatic 3He/4He signature of fluids degassed from a magmatic system is crucial for making inferences on its mantle source. This is especially important in arc volcanism, where variations in the composition of the wedge potentially induced by slab sediment fluids must be distinguished from the effects of magma differentiation, degassing, and crustal contamination. The study of fluid inclusions (FIs) trapped in minerals of volcanic rocks is becoming an increasingly used methodology in geochemical studies that integrates the classical study of volcanic and geothermal fluids. Here, we report on the first noble gas (He, Ne, Ar) concentrations and isotopic ratios of FI in olivine (Ol) and pyroxene (Px) crystals separated from eruptive products of the Telica and Baru volcanoes, belonging to the Nicaraguan and Panamanian arc-segments of Central America Volcanic arc (CAVA). FIs from Telica yield air corrected 3He/4He (Rc/Ra) of 7.2–7.4 Ra in Ol and 6.1–7.3 in Px, while those from Baru give 7.1–8.0 Ra in Ol and 4.2–5.8 Ra in Px. After a data quality check and a comparison with previous 3He/4He measurements carried out on the same volcanoes and along CAVA, we constrained a magmatic Rc/Ra signature of 7.5 Ra for Telica and of 8.0 Ra for Baru, both within the MORB range (8 ± 1 Ra). These 3He/4He differences also reflect variations in the respective arc-segments, which cannot be explained by radiogenic 4He addition due to variable crust thickness, as the mantle beneath Nicaragua and Panama is at about 35 and 30 km, respectively. We instead highlight that the lowest 3He/4He signature observed in the Nicaraguan arc segment reflects a contamination of the underlying wedge by slab sediment fluids. Rc/Ra values up to 9.0 Ra are found at Pacaya volcano in Guatemala, where the crust is 45 km thick, while a 3He/4He signature of about 8.0 Ra was measured at Turrialba volcano in Costa Rica, which is similar to that of Baru, and reflects possible influence of slab melting, triggered by a change in subduction conditions and the contemporary subduction of the Galapagos hot-spot track below southern Costa Rica and western Panama.

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Section: Samples and Methodsmentioning

confidence: 99%

Section: Isotope Composition Of Noble Gases In Fluid Inclusionsmentioning

confidence: 99%

3He/4He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc

et al. 2022

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“…Mantle xenoliths and lavas were crushed for noble gas and CO 2 isotopic determinations following the same methods and analytical procedures described in Rizzo et al (2018), Rizzo et al (2021), Sandoval-Velasquez et al (2021a), and Sandoval-Velasquez et al (2021b. After crushing, samples were sieved with the aim of hand-picking crystals (with diameters >0.25 mm) of Ol, Opx, and Cpx from mantle xenoliths and only Ol crystals from lavas.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…Neon and argon isotopes measured in mantle rocks generally reflect mixing between mantle and atmospheric fluids that suggests a contamination of FI by air-derived noble gases (Farley and Poreda, 1993;Matsumoto et al, 2001;Graham, 2002;Ozima and Podosek, 2002;Hopp et al, 2007a;Martelli et al, 2011;Rizzo et al, 2018;Rizzo et al, 2021). While atmospheric contamination of FI can occur during eruption of the transporting magmas, or during exposure of mantle xenoliths to the surface, the recycling of atmospheric gases into the local mantle has also been proposed.…”

Section: A Slab-recycled Atmospheric Component In the Mantlementioning

confidence: 99%

“…, Matsumoto et al (2002),Rizzo et al (2018),Rizzo et al (2021), and Sandoval-Velasquez et al (2021b) suggest the existence of recycled atmospheric fluids in the Subcontinetal Lithospheric mantle (SCLM; even far from present-day subduction zones) based on analysis of 3 He/ 36 Ar, 4 He/ 20 Ne, 20 Ne/ 22 Ne, 21 Ne/ 22 Ne, 36 Ar/ 22 Ne and 40 Ar/ 36 Ar ratios in FI trapped in ultramafic xenoliths.…”

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The heterogeneity of the Mexican lithospheric mantle: Clues from noble gas and CO2 isotopes in fluid inclusions

et al. 2022

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The abundance of mantle-derived rocks and lavas, in combination with its tectonic evolution, render Mexico a perfect laboratory to investigate the chemical and the isotopic heterogeneity of the lithospheric mantle. New data on the composition of noble gases and CO2 in Mexican mantle xenoliths and lavas is reported. Our samples consist of six ultramafic nodules from the Durango Volcanic Field (DVF) and the San Quintin Volcanic Field (SQVF), monogenetic complexes belonging to the Mexican Basin and Range province; and four lavas from the Sierra Chichinautzin (SCN), a Quaternary monogenetic volcanic field located in the Mexican volcanic arc. Ne and Ar isotopes in fluid inclusions reveal mixing between atmospheric and MORB-like fluids (e.g., 40Ar/36Ar < 1,200). DVF and SQVF nodules record low 40Ar/36Ar and 4He/20Ne that confirm the existence of recycled atmospheric-derived noble gases in the local mantle. The averages of the Rc/Ra ratios (3He/4He corrected for atmospheric contamination) measured in Mexican localities are within the MORB-like range: DVF= 8.39 ± 0.24 Ra, SQVF = 7.43 ± 0.19 Ra and SCN lavas = 7.15 ± 0.33 Ra (1σ). With the aim of assessing the isotopic variability of the Mexican lithospheric mantle, the above results were compared with similar data previously obtained from ultramafic nodules found in the Ventura Espiritu Santo Volcanic Field (VESVF), another Quaternary monogenetic volcanic complex belonging the Basin and Range. The higher 3He/4He ratios in DVF relative to those reported for the VESVF and the SQVF are explained as reflecting different ages of mantle refertilization, triggered by the retreating of the Farallon slab (∼40 Ma ago) and associated delamination slab processes. We propose that the DVF mantle was refertilized more recently (<10 Ma ago) than the mantle beneath the SQVF and VESVF (∼40–20 Ma ago). On the other hand, He-Ne-Ar compositions of SCN olivines share similarities with VESVF xenoliths, suggesting a relatively homogeneous lithospheric mantle in central Mexico. Finally, DVF and the SCN samples exhibit δ13C values within the MORB range (comparable to other values previously reported in fluid inclusions and fumaroles from Popocatépetl, Colima—Ceboruco volcanoes). While we explain the MORB-like carbon signatures of the DVF samples as the result of the above-mentioned refertilization process, the SCN signatures likely reflect either (i) trapping of isotopically fractionated CO2 derived from magmatic degassing or (ii) a mantle source unaffected by subduction-related crustal carbon recycling.

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Petrology of lherzolite xenoliths of Hosséré Sédé volcano (Adamawa plateau, Ngaoundéré area, Cameroon)

Nkouandou,

Bardintzeff,

Fagny Mefire

et al. 2023

Acta Geochim

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Melting and metasomatism in West Eifel and Siebengebirge Sub-Continental Lithospheric Mantle: Evidence from concentrations of volatiles in fluid inclusions and petrology of ultramafic xenoliths

Cited by 12 publications

References 118 publications

3He/4He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc

3He/4He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc

The heterogeneity of the Mexican lithospheric mantle: Clues from noble gas and CO2 isotopes in fluid inclusions

Petrology of lherzolite xenoliths of Hosséré Sédé volcano (Adamawa plateau, Ngaoundéré area, Cameroon)

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