Thermal structure beneath Far Eastern Russia inferred from geothermobarometric analyses of mantle xenoliths: Direct evidence for high geothermal gradient in backarc lithosphere

Yamamoto, Junji; Nishimura, Koshi; Ishibashi, Hidemi; Kagi, Hiroyuki; Arai, Shoji; Prikhod’ko, V. S.

doi:10.1016/j.tecto.2012.06.005

Cited by 21 publications

(9 citation statements)

References 89 publications

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“…Zhao et al reported P‐wave velocity anomaly of >2% in the shallower upper mantle beneath eastern Asia. The seismological anomaly corresponds to >300°C, suggesting the occurrence of large‐scale magmatism in this area . It is necessary to reevaluate the relation between temperature and seismological velocity for the clarification of the cryptic magmatism.…”

Section: Resultsmentioning

confidence: 99%

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Hagiwara

Takahata

Torimoto

et al. 2018

J Raman Spectroscopy

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CO2 fluid inclusions are popular in the mantle‐derived rock. CO2 Raman densimeter is widely used for estimating depth provenance and magma plumbing system. However, in order to obtain precise CO2 density, we should also measure CO2 temperature simultaneously because the densimeter has temperature dependency. In this study, we measured CO2 Raman spectra with densities of 0.8–1.0 g/cm3 at temperatures of 15, 25, 35, 45, and 55°C using a high‐pressure optical cell. We propose a new equation relating hot bands to the Fermi diad intensity ratio, temperature, and distance between the Fermi diad (delta, cm−1), which has higher accuracy than those of previous studies (±3.9–4.7°C) across all measurement conditions. The change in temperature engenders thermal expansion or shrinkage of mineral, resulting in change in CO2 density of fluid inclusion. Simultaneous measurement of both density and temperature of CO2 will be a probe for elastic property of minerals.

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Section: Resultsmentioning

confidence: 99%

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Hagiwara

Takahata

Torimoto

et al. 2018

J Raman Spectroscopy

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“…Although natural opx in mantle xenoliths are normally poor in Ni content (e.g., Ishimaru et al, 2006;Yamamoto, Hirano, et al, 2009;Yamamoto, Nakai, et al, 2009;Yamamoto et al, 2012), Ni could be enriched in opx at some particular geological conditions of the Earth's interior (Ishimaru & Arai, 2008). Experimental studies on Ni partitioning between peridotite and melt have proven that Ni can be enriched in opx and olivine at high pressures (Burns, 1973).…”

Section: 1002/2017jb015169mentioning

confidence: 99%

Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions

Zhang

Fan

et al. 2018

JGR Solid Earth

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Synchrotron‐based high‐pressure and temperature single‐crystal X‐ray diffraction experiments were conducted on two hydrous orthoenstatite samples (oEn#1: Mg1.004Si0.996O3, ~619 ppm water; oEn#2: Mg0.947Ni0.055Si0.998O3, ~696 ppm water) to ~34 GPa and 700 K, using resistively heated diamond anvil cells. The α‐opx (Pbca space group)→β‐opx (P21/c space group) phase transition of oEn#1 occurs at 12.90(2) GPa, and the β‐opx phase persists to 34.25(1) GPa. The α‐β transition of oEn#2 occurs at 13.50(1) GPa, and a new isosymmetric β‐opx→β‐opxII transition takes place at 29.80(4) GPa. The β‐opxII phase is preserved down to 24.53(3) GPa during decompression. The transition to the monoclinic β‐opxII phase is interpreted as a result of incorporation of Ni2+ into the orthoenstatite structure. Fitting the third‐order Birch‐Murnaghan thermal equation of state to the single‐crystal P‐V‐T data yields the thermoelastic parameters of the α‐ and β‐opx phases for both orthoenstatite samples. This study is the first attempt to determine the thermal equation of state of the β‐opx phase. Our results suggest that several hundred ppm of water has negligible effects on the bulk modulus of orthoenstatite but notably enhances the thermal expansion. The potential effects of metastable orthoenstatite on subduction zone dynamics are discussed, and the possible contributions of displacive phase transitions to enhancement of the transformational faulting mechanism of the deep‐focus earthquakes in subducted slabs are considered. The presence of metastable orthoenstatite within cold slabs could promote slab stagnation above the 660‐km discontinuity.

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“…We selected a total of seven CO 2 ‐rich fluid inclusions hosted in mineral separates of orthopyroxene and Cr‐spinel, which are derived from a mantle xenolith designated as “En2A” from Ennokentiev, Sikhote‐Alin, Far Eastern Russia. Petrological descriptions were presented by Yamamoto et al [ 15 ] The fluid inclusion compositions were investigated using Raman spectroscopic analysis. Volatile species other than CO 2 are not detected from the seven inclusions.…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of a Raman CO₂ densimeter from 23°C to 200°C and 7.2 to 248.7 MPa: Evaluation of density underestimation by laser heating

Hagiwara

Kawano

Takahata

et al. 2021

J Raman Spectroscopy

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Unintended local temperature enhancement by excitation laser might change Raman spectral features and potentially lead to misinterpretation of the data. To evaluate robustness of Raman CO2 densimeters in the presence of laser heating, we investigate the relation between temperature (T, °C), density (ρ, g/cm3), and Fermi diad split (Δ, cm−1) using a high‐pressure optical cell at 23°C to 200°C and 7.2–248.7 MPa. Results indicate that Δ decreases concomitantly with increasing temperature for a constant density in all density regions investigated. This result suggests that the density estimated based on Δ might be underestimated if the fluid is heated locally by the laser. Combining results of earlier studies with those of the present study indicates that the temperature dependence of Δ (|(∂Δ/∂T)ρ|) has a maximum value around 0.6–0.7 g/cm3. Consequently, at very high densities such as 1.1–1.2 g/cm3, |(∂Δ/∂T)ρ| is small. Thus, Δ at such densities is less affected by laser heating. However, at densities below approximately 0.7 g/cm3, although |(∂Δ/∂T)ρ| becomes smaller at lower densities, the relative density decrease becomes larger even for a small density decrease because the density itself becomes smaller. Therefore, at such densities, a density decrease of more than 10% was observed for some fluid inclusions, even at typical laser powers for inclusion analysis. Finally, to accurately estimate the density even in the presence of laser heating, we show that it is effective to estimate the intercept Δ from the correlation between Δ and laser power and substitute it into Δ–ρ relations.

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Thermal structure beneath Far Eastern Russia inferred from geothermobarometric analyses of mantle xenoliths: Direct evidence for high geothermal gradient in backarc lithosphere

Cited by 21 publications

References 89 publications

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions

Temperature dependence of a Raman CO₂ densimeter from 23°C to 200°C and 7.2 to 248.7 MPa: Evaluation of density underestimation by laser heating

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Thermal structure beneath Far Eastern Russia inferred from geothermobarometric analyses of mantle xenoliths: Direct evidence for high geothermal gradient in backarc lithosphere

Cited by 21 publications

References 89 publications

CO2 Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

CO2 Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions

Temperature dependence of a Raman CO2 densimeter from 23°C to 200°C and 7.2 to 248.7 MPa: Evaluation of density underestimation by laser heating

Contact Info

Product

Resources

About

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Temperature dependence of a Raman CO₂ densimeter from 23°C to 200°C and 7.2 to 248.7 MPa: Evaluation of density underestimation by laser heating