Lattice preferred orientation of talc and implications for seismic anisotropy in subduction zones

Jungjin Lee, Haemyeong Jung, Reiner Klemd, Matthew S. Tarling, Dmitry Konopelko

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Article number116178
Number of pages11
JournalEarth and Planetary Science Letters
Volume537
DOIs
Publication statusPublished - 1 May 2020

Keywords

  • lattice preferred orientation
  • seismic anisotropy
  • subduction zone
  • talc
  • BEARING SERPENTINITE
  • ANTIGORITE
  • AMPHIBOLE
  • HIGH-PRESSURE STABILITY
  • MANTLE WEDGE
  • AZIMUTHAL ANISOTROPY
  • CHLORITE
  • SLAB
  • VELOCITIES
  • INSIGHTS

Fingerprint Dive into the research topics of 'Lattice preferred orientation of talc and implications for seismic anisotropy in subduction zones'. Together they form a unique fingerprint.

Cite this