H&lt;sub&gt;2&lt;/sub&gt;O, CO&lt;sub&gt;2&lt;/sub&gt;, F, S, Cl, and P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; analyses of silicate glasses using SIMS: Report of volatile standard glasses

Shimizu, Kenji; Ushikubo, T.; Hamada, Mareomi; Itoh, Shoichi; Higashi, Yoshitaka; Takáhashi, Eiichi; Ito, Motoo

doi:10.2343/geochemj.2.0470

Cited by 41 publications

(18 citation statements)

References 47 publications

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“…The indium discs were coated with gold and the Cl concentrations were determined using SIMS (CAMECA; IMS 1280HR) at the Kochi Institute for Core Sample Research, the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) 52,53 . A 20 kV (10 kV at the ion source and −10 kV at the sample surface) primary Cs + ion beam of 300–700 pA was defocused to a 15 μm diameter spot on the sample surface.…”

Section: Methodsmentioning

confidence: 99%

Tiny droplets of ocean island basalts unveil Earth’s deep chlorine cycle

et al. 2019

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Fully characterising the exchange of volatile elements between the Earth’s interior and surface layers has been a longstanding challenge. Volatiles scavenged from seawater by hydrothermally altered oceanic crust have been transferred to the upper mantle during subduction of the oceanic crust, but whether these volatiles are carried deeper into the lower mantle is poorly understood. Here we present evidence of the deep-mantle Cl cycle recorded in melt inclusions in olivine crystals in ocean island basalts sourced from the lower mantle. We show that Cl-rich melt inclusions are associated with radiogenic Pb isotopes, indicating ancient subducted oceanic crust in basalt sources, together with lithophile elements characteristic of melts from a carbonated source. These signatures collectively indicate that seawater-altered and carbonated oceanic crust conveyed surface Cl downward to the lower mantle, forming a Cl-rich reservoir that accounts for 13–26% or an even greater proportion of the total Cl in the mantle.

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Section: Methodsmentioning

confidence: 99%

Tiny droplets of ocean island basalts unveil Earth’s deep chlorine cycle

et al. 2019

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“…To analyze the hydrogen and carbon abundances in the samples, H/ 18 O and 12 C/ 18 O were monitored simultaneously using electron multipliers. The calibration lines for hydrogen and carbon were obtained from silicate glass standards (Shimizu et al, ). A primary ion beam of 133 Cs + with an accelerating voltage of 14.5 keV and a beam current of 1.8–2.5 nA were applied.…”

Section: Methodsmentioning

confidence: 99%

The Effects of Carbon Concentration and Silicate Composition on the Metal‐Silicate Partitioning of Carbon in a Shallow Magma Ocean

Kuwahara

Itoh

Nakada

et al. 2019

Geophysical Research Letters

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The partitioning of carbon between the core and mantle during the formation of terrestrial planets may have controlled the distribution of carbon in terrestrial planets. However, the abundance of carbon in the Earth's mantle is higher than a prediction based on previous metal‐silicate partitioning experiments of carbon at carbon‐saturated conditions by more than an order of magnitude. Here, we report new metal‐silicate partitioning experiments of carbon at carbon contents of 0.25–0.5 wt%. We show that the metal‐silicate partition coefficient of carbon ( DCmet/sil) strongly correlates with nonbridging oxygen per tetrahedral cations (nbo/t) of silicate melts at fnormalO2 conditions where C‐H species are stable. Moreover, the results suggest that DCmet/sil at carbon‐undersaturated conditions may be lower than that at carbon‐saturated condition. Thus, DCmet/sil at low carbon concentrations is essentially important to investigate the distribution of carbon in the Earth during the core formation.

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“…Figure 2 shows the Raman and IR spectra in the [OH − ] vibrational region, collected from two crystals from runs R623 and R624 in this study. Water content was measured using the SIMS technique, with Cameca IMS-1280 ion microprobe installed at School of Ocean and Earth Science and Technology, University of Hawaii at Manoa (Honolulu, HI, USA), with the calibration curves constructed using standards employed in previous studies [34,35]. Chemical composition analyses were carried out by the electron microprobe in energy dispersive mode with FEI Quanta 250 electron microscopy installed at the Department of Earth Sciences, National Cheng Kung University.…”

Section: Methodsmentioning

confidence: 99%

Compressional Behavior of Hydrous Orthoenstatite: Insight into the Nature of LVZ under Continental Plate

2020

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A suite of hydrous orthoenstatite crystals were synthesized at 5–7 GPa and 1100–1300 °C, corresponding to the mid upper mantle conditions in continental regions. The synthetic crystals presented a clear, inclusion-free, and euhedral form with a size range from 100 to a few hundred microns. The Al- and water content of crystals were less than 2 wt. % and ranging from ~500 ppm to 1000 ppm, respectively, characterized by Raman and IR spectroscopy, electron microscopy, and SIMS. The analysis shows that the capability of water incorporation for this suite of hydrous orthoenstatite is correlated to the Al-content in the crystal structure. To understand how the detailed crystal structure reflects the influence of water and Al, single crystal X ray diffraction analysis was performed for this suite of hydrous orthoenstatite. By comparing the results obtained at ambient conditions, we find that for low-level of Al-content, <2 wt. %, the Al3+ cation tends to occupy one of tetrahedral sites (TB) only. Analysis of the X ray diffraction results under high pressure indicates that the elasticity of orthoenstatites is insensitive to the presence of low-level water and Al. We use this finding to evaluate the velocity profile at the mid upper mantle of continental regions to compare with seismic observation. The comparison indicates that the cause of the low velocity zone in continental regions originates from the geotherm profile rather than the effect of water on the elasticity of mantle phases.

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H<sub>2</sub>O, CO<sub>2</sub>, F, S, Cl, and P<sub>2</sub>O<sub>5</sub> analyses of silicate glasses using SIMS: Report of volatile standard glasses

Cited by 41 publications

References 47 publications

Tiny droplets of ocean island basalts unveil Earth’s deep chlorine cycle

Tiny droplets of ocean island basalts unveil Earth’s deep chlorine cycle

The Effects of Carbon Concentration and Silicate Composition on the Metal‐Silicate Partitioning of Carbon in a Shallow Magma Ocean

Compressional Behavior of Hydrous Orthoenstatite: Insight into the Nature of LVZ under Continental Plate

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