Reevaluation of formation of metal nodules in ordinary chondrites

Ping Kong, Mitsuru Ebihara, Xiande Xie

研究成果: Article

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Compositions of four metal nodules from two ordinary chondrites, WIS91627 (H3.7) and Jilin (H5), were determined by instrumental and radiochemical neutron activation analyses. Compared with bulk metal fractions, the metal nodules are characterized by strong and variable depletion of the refractory siderophile elements Re, Os, Ir, Ru, Pt and Rh but normal W and Mo, some fractionation of Co from Ni, and low Cu concentrations. These characteristics are difficult to explain by shock-induced vaporization followed by fractional condensation, a mechanism suggested by Widom et al. (1986). We propose formation of metal nodules during metamorphism in the parent body. Refractory siderophile elements, such as Ir, Os, Rh, etc., are partly locked up in noble metal nuggets and cannot participate in kamacite formation. The occurrence of metal nodules in both equilibrated and unequilibrated ordinary chondrites suggests that diffusion along grain boundaries was important in the development of kamacite and taenite in ordinary chondrites.

元の言語English
ページ(範囲)993-998
ページ数6
ジャーナルMeteoritics and Planetary Science
33
発行部数5
DOI
出版物ステータスPublished - 1998 1 1
外部発表Yes

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ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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