Lattice preferred orientation of talc and implications for seismic anisotropy in subduction zones
Lee J, Jung H, Klemd R, Tarling MS, Konopelko D (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 537
Article Number: 116178
DOI: 10.1016/j.epsl.2020.116178
Abstract
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.
Authors with CRIS profile
Involved external institutions
Seoul National University (SNU) / 서울대학교
Korea, Republic of (KR)
University of Otago
New Zealand (NZ)
Saint Petersburg State University (SPbU) / Санкт-Петербургский государственный университет (СПбГУ)
Russian Federation (RU)
Korea, Republic of (KR)
University of Otago
New Zealand (NZ)
Saint Petersburg State University (SPbU) / Санкт-Петербургский государственный университет (СПбГУ)
Russian Federation (RU)
How to cite
APA:
Lee, J., Jung, H., Klemd, R., Tarling, M.S., & Konopelko, D. (2020). Lattice preferred orientation of talc and implications for seismic anisotropy in subduction zones. Earth and Planetary Science Letters, 537. https://doi.org/10.1016/j.epsl.2020.116178
MLA:
Lee, Jungjin, et al. "Lattice preferred orientation of talc and implications for seismic anisotropy in subduction zones." Earth and Planetary Science Letters 537 (2020).
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