最上部マントルかんらん岩の結晶方位ファブリックとP波速度構造  [in Japanese] Olivine Crystallographic Fabrics and Their P-wave Velocity Structures within Peridotites in the Uppermost Mantle  [in Japanese]

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Abstract

 Olivine crystal grains have various crystallographic orientations within a peridotite, resulting in a crystallographic fabric as well as a texture. Six types of fabrics have been identified in mantle peridotites: A, B, C, D, E and AG types. These fabric types have unique seismic properties such as P-wave and S-wave velocity anisotropy. A new method is proposed to classify olivine fabrics based on P-wave velocity structure on a Vp-Flinn diagram. Three P-wave velocities (<i>V<sub>1</sub></i>, <i>V<sub>2</sub></i>, <i>V<sub>3</sub></i>) are used, two of which are the maximum (<i>V<sub>1</sub></i>) and minimum (<i>V<sub>3</sub></i>) velocities, and the third (<i>V<sub>2</sub></i>) is the velocity perpendicular to the orientations of these two velocities. Relationships between <i>V<sub>1</sub></i>/<i>V<sub>2</sub></i> and <i>V<sub>2</sub></i>/<i>V<sub>3</sub></i> classify fabrics into three types: A type (equivalent to B, C and E types), D type and AG type. Moreover, taking into account structural framework such as foliation and lineation, the Vp-Flinn diagram can be expanded to identify all types of fabrics. This method is successfully applied to fabrics previously studied in Oman ophiolite.

Journal

  • Journal of Geography (Chigaku Zasshi)

    Journal of Geography (Chigaku Zasshi) 124(3), 397-409, 2015

    Tokyo Geographical Society

Codes

  • NII Article ID (NAID)
    130005087136
  • NII NACSIS-CAT ID (NCID)
    AN00322536
  • Text Lang
    JPN
  • ISSN
    0022-135X
  • NDL Article ID
    026597783
  • NDL Call No.
    Z15-169
  • Data Source
    NDL  J-STAGE 
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