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Crystal preferred orientation of an amphibole experimentally deformed by simple shear

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  • Byeongkwan Ko

    (Tectonophysics Laboratory, School of Earth and Environmental Sciences, Seoul National University
    Present address: School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85281, USA)

  • Haemyeong Jung

    (Tectonophysics Laboratory, School of Earth and Environmental Sciences, Seoul National University)

Abstract

Seismic anisotropy has been widely observed in crust and mantle materials and plays a key role in the understanding of structure and flow patterns. Although seismic anisotropy can be explained by the crystal preferred orientation (CPO) of highly anisotropic minerals in the crust, that is, amphibole, experimental studies on the CPO of amphibole are limited. Here we present the results of novel experiments on simple shear deformation of amphibolite at high pressure and temperatures (1 GPa, 480–700 °C). Depending on the temperature and stress, the deformed amphibole produced three types of CPOs and resulted in a strong seismic anisotropy. Our data provide a new understanding of the observed seismic anisotropy. The seismic data obtained from the amphibole CPOs revealed that anomalous seismic anisotropy observed in the deep crust, subducting slab and mantle wedge can be attributed to the CPO of amphibole.

Suggested Citation

  • Byeongkwan Ko & Haemyeong Jung, 2015. "Crystal preferred orientation of an amphibole experimentally deformed by simple shear," Nature Communications, Nature, vol. 6(1), pages 1-10, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7586
    DOI: 10.1038/ncomms7586
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    Cited by:

    1. Bingfeng Zhang & Xuewei Bao & Yingkai Wu & Yixian Xu & Wencai Yang, 2023. "Southern Tibetan rifting since late Miocene enabled by basal shear of the underthrusting Indian lithosphere," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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