Rhyolitic and basaltic reference materials for TC/EA analysis: Investigation of water extraction and D/H ratios

Bindeman, I. N.; Hudak, Michael R.; Palandri, James; Qi, Haiping; Milovský, Rastislav; Hervig, R. L.; Perfit, Michael R.

doi:10.1016/j.chemgeo.2021.120486

Cited by 7 publications

(6 citation statements)

References 61 publications

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“… a δD-H 2 O variation in glasses from the 2021 Fagradalsfjall eruption compared to the MORB UOB (University of Oregon Basalt) glass standard 30 . The δD range for fresh MORB is drawn after ref.…”

Section: Resultsmentioning

confidence: 99%

“…10‰ higher than North Atlantic depleted MORB 29 . We furthermore performed eight new analyses of MORB basaltic reference material (University of Oregon Basalt, “UOB”, an EMORB from the East Pacific Rise 30 ), which was run concurrently with the Icelandic unknowns and yielded δD values ranging from −72.2 to −87.3‰ with a mean of −79.2 ± 10‰ (2 SD, N = 8). While performing the hydrogen isotope analyses, we also performed 17 water analyses on Fagradalsfjall glass samples.…”

Section: Resultsmentioning

confidence: 99%

“…Methods are after refs. 30 , 47 and are summarised here. Samples weighing between 8 and 18 mg were loaded into Ag packets and dropped into a glassy carbon reactor held at 1450 °C.…”

Section: Methodsmentioning

confidence: 99%

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Diverse mantle components with invariant oxygen isotopes in the 2021 Fagradalsfjall eruption, Iceland

et al. 2022

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The basalts of the 2021 Fagradalsfjall eruption were the first erupted on the Reykjanes Peninsula in 781 years and offer a unique opportunity to determine the composition of the mantle underlying Iceland, in particular its oxygen isotope composition (δ18O values). The basalts show compositional variations in Zr/Y, Nb/Zr and Nb/Y values that span roughly half of the previously described range for Icelandic basaltic magmas and signal involvement of Icelandic plume (OIB) and Enriched Mid-Ocean Ridge Basalt (EMORB) in magma genesis. Here we show that Fagradalsfjall δ18O values are invariable (mean δ18O = 5.4 ± 0.3‰ 2 SD, N = 47) and indistinguishable from “normal” upper mantle, in contrast to significantly lower δ18O values reported for erupted materials elsewhere in Iceland (e.g., the 2014–2015 eruption at Holuhraun, Central Iceland). Thus, despite differing trace element characteristics, the melts that supplied the Fagradalsfjall eruption show no evidence for 18O-depleted mantle or interaction with low-δ18O crust and may therefore represent a useful mantle reference value in this part of the Icelandic plume system.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Diverse mantle components with invariant oxygen isotopes in the 2021 Fagradalsfjall eruption, Iceland

et al. 2022

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“…Water concentrations were determined by knowing water concentration (3.5 wt%) in the mica standards and used integration the peak areas of masses 2 (H 2 ) and 3 ( δ 2 H). Errors on δ 2 H are estimated to be in the vicinity of 2 permil while water in the vicinity of 0.05‰ 27 , 48 . Bulk water concentrations determined by TC/EA agree with bulk-rock loss on ignition (LOI) values determined by XRF.…”

Section: Methodsmentioning

confidence: 95%

Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica

Nelson

Cottle²,

Bindeman³

et al. 2022

Nat Commun

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The Early Jurassic Butcher Ridge Igneous Complex (BRIC) in the Transantarctic Mountains contains abundant and variably hydrated silicic glass which has the potential to preserve a rich paleoclimate record. Here we present Fourier Transform Infrared Spectroscopic data that indicates BRIC glasses contain up to ~8 wt.% molecular water (H2Om), and low (<0.8 wt.%) hydroxyl (OH) component, interpreted as evidence for secondary hydration by meteoric water. BRIC glasses contain the most depleted hydrogen isotopes yet measured in terrestrial rocks, down to δD = −325 ‰. In situ 40Ar/39Ar geochronology of hydrated glasses with ultra-depleted δD values yield ages from 105 Ma to 72 Ma with a peak at c. 91.4 Ma. Combined, these data suggest hydration of BRIC glasses by polar glacial ice and melt water during the Late Cretaceous, contradicting paleoclimate reconstructions of this period that suggest Antarctica was ice-free and part of a global hot greenhouse.

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“…Theoretically, different minerals or the same mineral with different compositions and OH-absorption bands should be used to derive the infrared absorption coefficient. TC/EA-MS has been demonstrated to be an effective method to accurately obtain water contents of glass, hydrous minerals and nominally anhydrous minerals (e.g., Gong et al 2007a, b, Chen et al 2011, Monie et al 2020, Bindeman et al 2021. During the analyses of gem-quality garnets, two reference materials NBS30 (biotite) and 04BXL02 (garnet) yield accurate water contents with high precision (Figure 1), and the multiple repeat analyses of individual garnet samples also yield consistent results within the analytical errors (Table S4).…”

Section: Calibration Of the Infrared Absorption Coefficient Of Struct...mentioning

confidence: 99%

Calibration of Infrared Absorption Coefficients for Structural Hydroxyl in Garnet by a Combined Study of Isotope Ratio Spectrometry and Vibrational Spectroscopy

Zhu

Chen

Zheng

et al. 2022

Geostandard Geoanalytic Res

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An accurate determination of water content in garnet is critical to quantify the transport of water to the deep mantle by the subducted oceanic crust beyond the breakdown of hydrous phases. Fourier transform infrared spectroscopy (FTIR) is the most widely used approach to determine the species and contents of water in garnet. Accurate quantification of OH in garnet requires independent calibration using an external method, as OH absorbance is mineral and composition specific. To obtain the infrared absorption coefficients of structural hydroxyl in garnet, a combined study of spectrometric analyses by FTIR and a method combining a thermal conversion elemental analyser with isotope ratio mass spectrometry (TC/EA-MS) was carried out for fourteen gem-quality natural garnet crystals with variable compositions. The obtained molar absorption coefficients were 9322 AE 338 and 240 AE 26 l mol -1 cm -2 for grossular-and spessartine-rich garnet and pyrope-almandine garnet, respectively. These results are within the range of previous studies. A new molar absorption coefficient of 689 AE 177 l mol -1 cm -2 was obtained for pyrope-spessartine garnet. The large variation in the absorption coefficient indicates it is controlled by both garnet composition and OH-absorption bands. The obtained absorption coefficients are only appropriate for certain types of eclogitic garnet, and more studies should be carried out on eclogitic garnets.

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Rhyolitic and basaltic reference materials for TC/EA analysis: Investigation of water extraction and D/H ratios

Cited by 7 publications

References 61 publications

Diverse mantle components with invariant oxygen isotopes in the 2021 Fagradalsfjall eruption, Iceland

Diverse mantle components with invariant oxygen isotopes in the 2021 Fagradalsfjall eruption, Iceland

Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica

Calibration of Infrared Absorption Coefficients for Structural Hydroxyl in Garnet by a Combined Study of Isotope Ratio Spectrometry and Vibrational Spectroscopy

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