Hydrogen Incorporation in Natural Mantle Olivines

Mosenfelder, J. L.; Sharp, T. G.; Asimow, Paul D.; Rossman, George R.

doi:10.1029/168gm05

Cited by 25 publications

(33 citation statements)

References 45 publications

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“…These disparities point to the fact that the casually termed 'titanian clinohumite-like defect' is structurally dissimilar to TiChu minerals apart from the fact that both have Ti in the sixfold coordinate site. Mosenfelder et al (2006b) presents a similar conclusion based on the inconsistency of peak intensities found in experimental and natural olivine crystals with TiChu-like defects.…”

Section: Application Of the Correlation To Complex Natural Situationssupporting

confidence: 54%

“…Estimation of the chemical composition from IR spectra is probably a useful alternative for cases such as complex intergrowths of TiChu with olivine. Clinohumite crystals in olivine can occur as lamellae at scales ranging from several hundred nanometers to several tens of micrometers (Wirth et al 2001;Mosenfelder et al 2006b;Berry et al 2007). Because a higher F abundance stabilizes TiChu at higher temperatures (Evans and Trommsdorff 1983), the identification of such lamellae in olivines can provide new information about the volatile element sink that is transported deep into the mantle.…”

Section: Application Of the Correlation To Complex Natural Situationsmentioning

confidence: 99%

“…Among recent reports on the hydrogen incorporation mechanisms in olivine, the presence of clinohumite-type OH defects has been proposed as one of the critical natural incorporation mechanisms Berry et al 2005;Mosenfelder et al 2006b;Berry et al 2007;Walker et al 2007). Our IR characterization should not be applied to the investigation of olivine point defect structures because the reported IR spectra in olivine are suggestive of dissimilarities between TiChu structures and TiChu-like defects.…”

Section: Application Of the Correlation To Complex Natural Situationsmentioning

confidence: 99%

“…Despite its accessory character, TiChu is thought to play an important role in the storage of water (McGetchin and Silver 1970), fluorine (Engi and Lindsley 1980), boron and lithium (Scambelluri et al 2004), and the high field strength elements Nb and Ta (Scambelluri et al 2001;Garrido et al 2005) in upper mantle ultrabasic rocks. Furthermore, natural mantle olivine usually contains TiChu as defects and patches (Kitamura et al 1987;Wirth et al 2001;Berry et al 2005;Mosenfelder et al 2006aMosenfelder et al , 2006b, which may be an effective mechanism for incorporating hydrogen into this nominally anhydrous mantle mineral (Wirth et al 2001;Berry et al 2005;Mosenfelder et al 2006b). …”

Section: Introductionmentioning

confidence: 99%

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FTIR and Raman spectroscopy characterization of fluorine-bearing titanian clinohumite in antigorite serpentinite and chlorite harzburgite

et al. 2014

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Titanian clinohumite is an accessory phase found in peridotites, and it can be a key repository of volatile and other trace elements in sub-arc mantle. To characterize spectroscopic variations due to volatile elements in the phase, we have investigated the infrared spectroscopic characteristics of a suite of naturally occurring Ti clinohumite minerals with varying F and Ti concentrations. Samples were ultramafic rocks from Cerro del Almirez, Spain and Cima di Gagnone, Switzerland. The infrared spectra corresponding to OH vibrations showed systematic variation in regard to the abundance of F in Ti clinohumite. In particular, the intensity ratios of infrared absorption spectra at 3,565 and 3,390 cm −1 correlated linearly with the abundance of F independently of the crystal orientation. Raman spectra did not corroborate the Fourier transform infrared (FTIR) results. This intensity ratio provides an alternative analytical criterion for the characterization of Ti clinohumite.

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Section: Application Of the Correlation To Complex Natural Situationssupporting

confidence: 54%

Section: Application Of the Correlation To Complex Natural Situationsmentioning

confidence: 99%

Section: Application Of the Correlation To Complex Natural Situationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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FTIR and Raman spectroscopy characterization of fluorine-bearing titanian clinohumite in antigorite serpentinite and chlorite harzburgite

et al. 2014

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“…Although extensive investigations (e.g. Mosenfelder et al, 2013;Jahn et al, 2013;Ghosh et al, 2013) have been devoted to hydrogen incorporation, there is much uncertainty about the microscopic mechanisms underlying such reactions. In literature, several models are available to account for the uptake of hydrogen in high-pressure mineral phases: cation-vacancy occurrence and H-compensation (hydro-garnet-like substitution); double replacement, such as 2Mg/1Si M Al(Fe 3+ ) + H; reduction of iron to Fe-metallic (Keppler and Bolfan-Casanova, 2006;Litasov, 2010).…”

Section: Introductionmentioning

confidence: 99%

Lower mantle hydrogen partitioning between periclase and perovskite: A quantum chemical modelling

Merli

Bonadiman

Diella

et al. 2016

Geochimica et Cosmochimica Acta

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Toward a unified hydrous olivine electrical conductivity law

Gardès

Gaillard

Tarits

2014

Geochem Geophys Geosyst

127

185

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It has long been proposed that water incorporation in olivine has dramatic effects on the upper mantle properties, affecting large-scale geodynamics, and triggering high electrical conductivity. But the laboratory-based laws of olivine electrical conductivity predict contrasting effects of water, precluding the interpretation of geophysical data in term of mantle hydration. We review the experimental measurements of hydrous olivine conductivity and conclude that most of data are consistent when errors in samples water contents are considered. We report a new law calibrated on the largest database of measurements on hydrous olivine oriented single crystals and polycrystals. It fits most of measurements within uncertainties, and is compatible with most of geophysical data within petrological constraints on mantle olivine hydration. The conductivity anisotropy of hydrous olivine might be higher than dry olivine, but preferential orientation should produce moderate anisotropy ($0-0.8 log unit). In the oceanic mantle, the enhancement of olivine conductivity is limited to $1 log unit in the maximum range of mantle olivine water concentrations (0-500 wt ppm). Strongest enhancements are expected in colder regions, like cratonic lithospheres and subduction settings. High conductivities in melt-free mantle require great depths and high water concentrations in olivine (>0.1 S/m at >250 km and >200 wt ppm). Thus, the hydration of olivine appears unlikely to produce the highest conductivities of the upper mantle.

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Hydrogen Incorporation in Natural Mantle Olivines

Cited by 25 publications

References 45 publications

FTIR and Raman spectroscopy characterization of fluorine-bearing titanian clinohumite in antigorite serpentinite and chlorite harzburgite

FTIR and Raman spectroscopy characterization of fluorine-bearing titanian clinohumite in antigorite serpentinite and chlorite harzburgite

Lower mantle hydrogen partitioning between periclase and perovskite: A quantum chemical modelling

Toward a unified hydrous olivine electrical conductivity law

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