Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Lattice preferred orientation of talc and implications for seismic anisotropy in subduction zones. / Lee, Jungjin; Jung, Haemyeong; Klemd, Reiner и др.
в: Earth and Planetary Science Letters, Том 537, 116178, 01.05.2020.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Lattice preferred orientation of talc and implications for seismic anisotropy in subduction zones
AU - Lee, Jungjin
AU - Jung, Haemyeong
AU - Klemd, Reiner
AU - Tarling, Matthew S.
AU - Konopelko, Dmitry
PY - 2020/5/1
Y1 - 2020/5/1
N2 - Strong seismic anisotropy is generally observed in subduction zones. Lattice preferred orientation (LPO) of olivine and elastically anisotropic hydrous minerals has been considered to be an important factor causing anomalous seismic anisotropy. For the first time, we report on measured LPOs of polycrystalline talc. The study comprises subduction-related ultrahigh-pressure metamorphic schists from the Makbal Complex in Kyrgyzstan-Kazakhstan and amphibolite-facies metasomatic schists from the Valla Field Block in Unst, Scotland. The here studied talc revealed a strong alignment of (001) planes (sub)parallel to the foliation and a girdle distribution of [100] axes and (010) poles (sub)parallel to the foliation. The LPOs of polycrystalline talc produced a significant P-wave anisotropy (AVp = 72%) and a high maximum S-wave anisotropy (max AVs = 24%). The results imply that the LPO of talc influence both the strong trench-parallel azimuthal anisotropy and positive/negative radial anisotropy of P-waves, and the trench-parallel seismic anisotropy of S-waves in subduction zones.
AB - Strong seismic anisotropy is generally observed in subduction zones. Lattice preferred orientation (LPO) of olivine and elastically anisotropic hydrous minerals has been considered to be an important factor causing anomalous seismic anisotropy. For the first time, we report on measured LPOs of polycrystalline talc. The study comprises subduction-related ultrahigh-pressure metamorphic schists from the Makbal Complex in Kyrgyzstan-Kazakhstan and amphibolite-facies metasomatic schists from the Valla Field Block in Unst, Scotland. The here studied talc revealed a strong alignment of (001) planes (sub)parallel to the foliation and a girdle distribution of [100] axes and (010) poles (sub)parallel to the foliation. The LPOs of polycrystalline talc produced a significant P-wave anisotropy (AVp = 72%) and a high maximum S-wave anisotropy (max AVs = 24%). The results imply that the LPO of talc influence both the strong trench-parallel azimuthal anisotropy and positive/negative radial anisotropy of P-waves, and the trench-parallel seismic anisotropy of S-waves in subduction zones.
KW - lattice preferred orientation
KW - seismic anisotropy
KW - subduction zone
KW - talc
KW - BEARING SERPENTINITE
KW - ANTIGORITE
KW - AMPHIBOLE
KW - HIGH-PRESSURE STABILITY
KW - MANTLE WEDGE
KW - AZIMUTHAL ANISOTROPY
KW - CHLORITE
KW - SLAB
KW - VELOCITIES
KW - INSIGHTS
UR - http://www.scopus.com/inward/record.url?scp=85080075025&partnerID=8YFLogxK
U2 - 10.1016/j.epsl.2020.116178
DO - 10.1016/j.epsl.2020.116178
M3 - Article
AN - SCOPUS:85080075025
VL - 537
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
SN - 0012-821X
M1 - 116178
ER -
ID: 23641754