KOPRI Repository

Microfabrics of omphacite and garnet in eclogite from the Lanterman Range, northern Victoria Land, Antarctica

Cited 2 time in wos
Cited 3 time in scopus
Metadata Downloads
Title
Microfabrics of omphacite and garnet in eclogite from the Lanterman Range, northern Victoria Land, Antarctica
Other Titles
남극 북빅토리아랜드 랜터만산맥에서 산출하는 에클로자이트 내 녹휘석과 석류석의 미구조
Authors
Kim, Daeyeong
Taehwan Kim
Jeongmin Lee
Yoonsup Kim
Hyeoncheol Kim
Lee, Jong Ik
Keywords
eclogite; electron backscatter diffraction (EBSD); garnet; layered structure; omphacite; seismic anisotropy
Issue Date
2018
Citation
Kim, Daeyeong, et al. 2018. "Microfabrics of omphacite and garnet in eclogite from the Lanterman Range, northern Victoria Land, Antarctica". GEOSCIENCES JOURNAL, 22(6): 939-953.
Abstract
We examined the microfabrics of omphacite and garnet in foliated eclogite to determine the influence of the layered structure on seismic observations in subduction zone. The analyzed eclogite, from the Lanterman Range, northern Victoria Land, Antarctica, is characterized by layering in which the modal abundances of garnet and omphacite vary. For garnet, the low aspect ratios, similar angular distribution of long axes relative to the foliation in both layers, uniform grain size distribution, near-random crystallographic preferred orientations (CPOs), and misorientation angle distributions are indicative of passive behavior during deformation. In contrast, omphacite shows relatively high aspec t ratios, a low angle between the long axes of crystals and the foliation, a wide grain-size distribution, and distinctive CPOs, suggesting dislocation creep as the main deformation mechanism. The results of fabric analyses are consistent with strain localization into omphacite or omphacite-rich layers rather than garnet or garnet-rich layers. The single-crystal seismic anisotropy of garnet is very weak (AVP = 0.2%, AVS = 0.5?0.6%), whereas that of omphacite is much stronger (AVP = 3.7?5.9% and AVS = 2.9?3.8%). Seismic anisotropy of the omphacite-rich layers shows an increase of 329% for AVP and 146% for AVS relative to garnet-rich layers. Our results demonstrate the importance of the layered structure in strain localization and in the development of the seismic anisotropies of subducting oceanic crust.
URI
http://repository.kopri.re.kr/handle/201206/9913
DOI
http://dx.doi.org/10.1007/s12303-018-0055-7
Files in This Item
There are no files associated with this item.
General Conditions
      ROMEO Green
    Can archive pre-print and post-print or publisher's version/PDF
      ROMEO Blue
    Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
      ROMEO Yellow
    Can archive pre-print (ie pre-refereeing)
      ROMEO White
    Archiving not formally supported

    Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

    Browse