二重構造を持つカンラン石単結晶の合成と拡散計数の測定  [in Japanese] Synthesis and diffusion measurement of double-layered single crystals of olivine  [in Japanese]

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Author(s)

Abstract

Double-layered single crystals of olivine, (Mg, Ni)<sub>2</sub>SiO<sub>4</sub>-and (Mg, Co)<sub>2</sub>SiO<sub>4</sub>-Mg<sub>2</sub>SiO<sub>4</sub>, were synthesized for the purpose of measuring cation inter-diffusivities in olivine. The olivine solid solution layers were epitaxially overgrown on the surface of forsterite seed crystals in Li<sub>2</sub>O-MoO<sub>3</sub>-V<sub>2</sub>O<sub>5</sub> flux systems at temperatures below, 1,000℃. Diffusion annealing was performed at 1,050〜1,450℃ for 5 hours to 81 days. Diffusion coefficients observed showed relations D=D<sub>0</sub>exp (-E<sub>D</sub>/kT), where D<sub>0</sub> for Co-Mg and Ni-Mg are 68.6 and 15.1 cm<sup>2</sup>/sec, respectively and E<sub>D</sub> for both Co-Mg and Ni-Mg are 407 kJ/mol. The observed D's are nearly an order of magnitude lower than those previously observed by Morioka (1980;1981), although E<sub>D</sub>'s agree with the previous values. The observed discrepanceies in D's were discussed in terms of diffusion mechanism.

Journal

  • Chikyukagaku

    Chikyukagaku 30(1), 17-25, 1996

    The Geochemical Society of Japan

References:  22

Codes

  • NII Article ID (NAID)
    110008679909
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0386-4073
  • NDL Article ID
    3946323
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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