Constraining the density evolution during destruction of the lithospheric mantle in the eastern North China Craton

Ye, Zhilin; Fan, Dongrui; Tang, Qizhe; Xu, Jingui; Zhang, Dongzhou; Zhou, Wenge

doi:10.1016/j.gr.2020.12.001

Cited by 6 publications

(6 citation statements)

References 134 publications

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“…However, in view of the density of diaspore is higher than ambient mantle (PREM model), diaspore still can subduct together with subduction slabs. To sum up, we believe that diaspore could contribute to slab subduction and bring water into the Earth's interior (at depth approximately 390 km under cold subduction conditions based on existing experimental data) (Ye et al, 2021). Moreover, diaspore dehydrates and releases free H 2 O when the subducted slab is heated by the surrounding mantle to a higher temperature.…”

Section: P-t Phase Diagram Of Diaspore and Its Stability Under High P...mentioning

confidence: 83%

“…Finally, combining the results in this study with those of previous studies, we plotted the P-T phase diagram of diaspore and concluded that diaspore can subduct to a depth of ∼390 km under cold subduction conditions (temperature gradient <5 K/ km) based on existing experimental data. (Ballaran and Angel, 2003), Antigorite (Yang et al, 2014), Epidote (Li et al, 2021) and rocks (Harzburgite and Eclogite (Ye et al, 2021)) to ∼500 km along the Tonga slab geotherm, and compared with that of the PREM model (Dziewonski and Anderson, 1981).…”

Section: Discussionmentioning

confidence: 99%

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Stability and Thermoelasticity of Diaspore by Synchrotron X-ray Diffraction and Raman Spectroscopy

Huang

Liu

et al. 2021

Front. Earth Sci.

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The thermoelasticity and stability of diaspore (α-AlOOH, Al1.002Fe0.003OOH) were investigated in this study by in situ synchronous X-ray diffraction (XRD) and Raman spectroscopy methods at high pressure and high temperature conditions. The results indicate that diaspore is stable within the pressure and temperature (P-T) region examined in this study. With increasing pressure, the Raman peaks move toward the high wave number direction, the intensity of the Raman peaks increases, and the vibration mode of diaspore changes linearly. Pressure-volume data from in situ high-pressure XRD experiments were fitted by the third-order Birch-Murnaghan equation of state (EoS) with the zero-pressure unit-cell volume V0 = 118.15 (4) Å3, the zero-pressure bulk modulus KV0 = 153 (2) GPa, and its pressure derivative K'V0 = 2.4 (3). When K'V0 was fixed at 4, the obtained KV0 = 143 (1) GPa. The axial compressional behavior of diaspore was also fitted with a linearized third-order Birch-Murnaghan EoS, showing slight compression anisotropy with Ka0 = 137 (5) GPa, Kb0 = 169 (7) GPa and Kc0 = 178 (6) GPa. In addition, the temperature-volume data from in situ high-temperature XRD experiments were fitted by Fei’s thermal equation with the thermal expansion coefficients αV = 2.7 (2) × 10–5 K−1, αa = 1.13 (9) × 10–5 K−1, αb = 0.77 (5) × 10–5 K−1, and αc = 0.85 (9) × 10–5 K−1 for diaspore, which shows that diaspore exhibits slightly anisotropic thermal expansion. Furthermore, in situ synchrotron-based single-crystal XRD under simultaneously high P-T conditions indicates that the P-T stability of diaspore is up to ∼10.9 GPa and 700 K. Combined with previous results, we infer that diaspore can be subducted to ∼390 km under cold subduction conditions based on existing experimental data and is a good candidate for transporting water to the deep Earth.

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Section: P-t Phase Diagram Of Diaspore and Its Stability Under High P...mentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Stability and Thermoelasticity of Diaspore by Synchrotron X-ray Diffraction and Raman Spectroscopy

Huang

Liu

et al. 2021

Front. Earth Sci.

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“…High-temperature conditions up to 700 K are provided by the heating resistor. Setup details for the employed thermocouples and heaters can be found in our previous articles (Xu et al, 2019(Xu et al, , 2020bYe et al, 2021).…”

Section: Synchrotron X-ray Diffractionmentioning

confidence: 99%

“…However, few studies have systematically illuminated the issue of delamination from the perspective of eclogite density. Here, we attempt to offer new insights into the derivation of rock density through the mineral physics method to constrain delamination in Tibet (Ye et al, 2021). Conducting a single experiment under high-pressure and high-temperature conditions, we obtain the equation of state (EoS) of the main minerals of eclogite with fewer systematic errors in the experiment.…”

Section: Introductionmentioning

confidence: 99%

“…Conducting a single experiment under high-pressure and high-temperature conditions, we obtain the equation of state (EoS) of the main minerals of eclogite with fewer systematic errors in the experiment. Furthermore, the newly derived EoS of the main minerals of eclogite, combined with the published EoSs of the main minerals of peridotite (Ye et al, 2021), geothermal lines, and collected eclogite mineral compositions, are further used to elucidate a density evolution model during the delamination process in Tibet. We argue that the EoSs of minerals could be used in a straightforward manner as new constraints on the construction of the density model.…”

Section: Introductionmentioning

confidence: 99%

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Delamination in Tibet: Deriving constraints from the density of eclogite

Fan

et al. 2021

Preprint

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Abstract. Tibet, which is characterized by collisional orogens, has undergone the process of delamination or convective removal. The lower crust and mantle lithosphere appear to have been removed through delamination during orogenic development. Numerical and analog experiments demonstrate that the metamorphic eclogitized oceanic subduction slab or lower crust may promote gravitational instability due to its increased density. The eclogitized oceanic subduction slab or crustal root is believed to be denser than the underlying mantle and tends to sink. However, the density of eclogite under high-pressure and high-temperature conditions and density differences from the surrounding mantle is not preciously constrained. Here, we offer new insights into the derivation of eclogite density with a single experiment to constrain delamination in Tibet. Using in situ synchrotron X-ray diffraction combined with diamond anvil cell, experiments focused on minerals (garnet, omphacite, and epidote) of eclogite are conducted under simultaneous high-pressure and high-temperature conditions, which avoids systematic errors. Fitting the pressure-temperature-volume data with the third-order Birch-Murnaghan equation of state, the thermal equation of state (EoS) parameters, including the bulk modulus (KT0), its pressure derivative (KT0′), the temperature derivative ((KT/T)P), and the thermal expansion coefficient (α0), are derived. The densities of rock-forming minerals and eclogite are modeled along with the geotherms of two types of delamination. The delamination processes of subduction slab breakoff and the removal of the eclogitized lower crust in Tibet are discussed. The Tibetan eclogite which containing 40–60 vol. % garnet and 37–64 % degrees of eclogitization can promote the delamination of slab break-off in Tibet. Our results indicate that eclogite is a major controlling factor in the initiation of delamination. A high abundance of garnet, a high Fe-content, and a high degree of eclogitization are more conducive to instigating the delamination.

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Recent developments on high-pressure single-crystal X-ray diffraction at the Partnership for eXtreme Xtallography (PX2) program

Zhang

Dera

et al. 2022

Phys Chem Minerals

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Constraining the density evolution during destruction of the lithospheric mantle in the eastern North China Craton

Cited by 6 publications

References 134 publications

Stability and Thermoelasticity of Diaspore by Synchrotron X-ray Diffraction and Raman Spectroscopy

Stability and Thermoelasticity of Diaspore by Synchrotron X-ray Diffraction and Raman Spectroscopy

Delamination in Tibet: Deriving constraints from the density of eclogite

Recent developments on high-pressure single-crystal X-ray diffraction at the Partnership for eXtreme Xtallography (PX2) program

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