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Upper mantle seismic anisotropy beneath the Northern Transantarctic Mountains inferred from peridotite xenoliths near Mt. Melbourne, northern Victoria Land, Antarctica

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Title
Upper mantle seismic anisotropy beneath the Northern Transantarctic Mountains inferred from peridotite xenoliths near Mt. Melbourne, northern Victoria Land, Antarctica
Other Titles
남극 북빅토리아랜드 멜버른화산 주변의 맨틀포획암으로터 산출된 남극종단산맥 아래 맨틀의 지진파비등방성
Authors
Kim, Daeyeong
Park, Munjae
Park, Yongcheol
Qi, Chao
Kim, Hwayoung
Lee, Mi Jung
Michibayashi, Katsuyoshi
Subject
Geology
Keywords
Mantle xenolith; Mt. Melbourne; Seismic anisotropy; Olivine; Crystallographic preferred orientation; Electron backscatter diffraction
Issue Date
2021-02
Citation
Kim, Daeyeong, et al. 2021. "Upper mantle seismic anisotropy beneath the Northern Transantarctic Mountains inferred from peridotite xenoliths near Mt. Melbourne, northern Victoria Land, Antarctica". JOURNAL OF STRUCTURAL GEOLOGY, 143(1): 104237-104237.
Abstract
Microstructural investigations of mantle xenoliths from the Mt. Melbourne area were undertaken to reveal the origin of S-wave splitting beneath northern Victoria Land, Antarctica. The six analyzed peridotites contain various deformation features. The rotated olivine maxima of [100] and [010] into horizontal and vertical orientations, respectively, are classified into five samples with a D-type crystallographic preferred orientation (CPO) and one sample as an A-type CPO. The D-type olivine fabric can be explained by multiple slip systems of {0kl}[100] at low-temperature and high-stress conditions; therefore, both compressional and extensional regimes during subduction and rifting, respectively, could be applied in this study. With an assumption that olivine a-axes are aligned along the direction of mantle flow to form maximum S-wave splitting, the observed delay time of 0.9?1.3 s beneath northern Victoria Land can be partially explained by the anisotropy in the mantle peridotites. The remaining seismic anisotropy can be explained by the presence of melt pockets trapped along tectonic faults that developed perpendicular to the fast S-wave splitting direction. This study therefore demonstrates that the NE?SW-trending S-wave splitting beneath northern Victoria Land, Antarctica, results from the existence of both mantle peridotites as well as melt pockets trapped along the tectonic faults.
URI
https://repository.kopri.re.kr/handle/201206/11786
DOI
http://dx.doi.org/10.1016/j.jsg.2020.104237
Appears in Collections  
2020-2020, Characterization and origin of the Zealandia-Antarctic mantle (20-20) / Park, Sung Hyun (PE20210)
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