The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform
Jun Ichi Ando - One of the best experts on this subject based on the ideXlab platform.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Using high-pressure deformation experiments, Ikuo Katayama and colleagues show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy. Using high-pressure deformation experiments, it is now shown that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth’s interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals1,2. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine3, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems4,5 is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine6, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities7.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth's interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities.
Ikuo Katayama - One of the best experts on this subject based on the ideXlab platform.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Using high-pressure deformation experiments, Ikuo Katayama and colleagues show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy. Using high-pressure deformation experiments, it is now shown that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth’s interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals1,2. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine3, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems4,5 is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine6, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities7.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth's interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities.
Ken Ichi Hirauchi - One of the best experts on this subject based on the ideXlab platform.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Using high-pressure deformation experiments, Ikuo Katayama and colleagues show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy. Using high-pressure deformation experiments, it is now shown that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth’s interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals1,2. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine3, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems4,5 is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine6, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities7.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth's interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities.
Katsuyoshi Michibayashi - One of the best experts on this subject based on the ideXlab platform.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Using high-pressure deformation experiments, Ikuo Katayama and colleagues show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy. Using high-pressure deformation experiments, it is now shown that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems. Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth’s interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals1,2. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine3, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems4,5 is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine6, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities7.
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Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge
Nature, 2009Co-Authors: Ikuo Katayama, Ken Ichi Hirauchi, Katsuyoshi Michibayashi, Jun Ichi AndoAbstract:Seismic anisotropy is a powerful tool for detecting the geometry and style of deformation in the Earth's interior, as it primarily reflects the deformation-induced preferred orientation of anisotropic crystals. Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy (delay time of one to two seconds) observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Here we show that the crystal-preferred orientation of serpentine, the main Hydrous Mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in subduction systems. High-pressure deformation experiments reveal that the serpentine c-axis tends to rotate to an orientation normal to the shear plane during deformation; consequently, seismic velocity propagating normal to the shear plane (plate interface) is much slower than that in other directions. The seismic anisotropy estimated for deformed serpentine aggregates is an order of magnitude greater than that for olivine, and therefore the alignment of serpentine in the hydrated mantle wedge results in a strong trench-parallel seismic anisotropy in the case of a steeply subducting slab. This hypothesis is also consistent with the presence of a Hydrous phase in the mantle wedge, as inferred from anomalously low seismic-wave velocities.
Hanspeter Schertl - One of the best experts on this subject based on the ideXlab platform.
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melting of Hydrous and carbonate Mineral inclusions in garnet host during ultrahigh pressure experiments
Lithos, 2008Co-Authors: A L Perchuk, M Burchard, Walter V Maresch, Hanspeter SchertlAbstract:Abstract Mineral inclusions in garnets are usually considered to be relict testimony of earlier metamorphic history, and thus play a key role in deciphering the pressure–temperature evolution of rocks. An experimental study on eclogitic garnets with different Mineral inclusions (including Hydrous phases and carbonates) from several subduction-related complexes reveals considerable modification of garnet interiors at temperatures ( T ) of 800–1100 °C and a pressure ( P ) of 4 GPa, representative of different diamond-bearing metamorphic UHP terranes. The experiments reveal that fluids liberated by the breakdown of the Hydrous Mineral inclusions control the development of melt pockets and typical patchy microstructures of garnet. The composition and extent of the development of new garnet and melt (either silicate or carbonate-silicate) strongly depend on the P-T conditions of the run and the types of Mineral inclusions involved. The recycling of the Mineral inclusions and the modification of the garnet host chemistry obliterates the record of earlier periods of metamorphic history. Patchy microstructures, as observed in the newly formed garnets, are proof of melt involvement in our experiments and may also point to similar processes in natural garnet-bearing UHP rocks. Such recrystallization of garnet interiors controlled by internally produced fluids has important potential consequences for thermobarometry, fluid-inclusion studies and for the rheology of (U)HP rocks.
