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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Formation mechanisms of ringwoodite: clues from the Martian meteorite Northwest Africa 8705

Fig. 4

BSE images of polycrystalline ringwoodite, rod-like ringwoodite and the coexisting wadsleyite in the shock-induced melt vein. a Low magnification BSE image shows a partially melted region (outlined with dotted line) with the presence of ringwoodite (Rwt) and matrix (Mtx). b Enlarged image of the white box “b” in a shows the polycrystalline ringwoodite with olivine (Ol) fragment pseudomorph. The yellow box is the position of FIB-slice #2. R7 and R8 are Raman analysis positions. c Higher magnification BSE image of the partially melted region in a, showing the presence of ringwoodite fragment and matrix. Pigeonite fragments (analyzed by Raman spectrum #3) are indicated by the white arrow. d Enlarged image of white box “d” in b. Raman spectra (R9 and R10) the intergrowth of ringwoodite, wadsleyite (Wad) and pyroxene (Px). The white spheres are sulfide (Sul). e Enlarged image of the white box “e” in c shows the texture of the shock-induced melt. The presence of ringwoodite was confirmed by Raman analysis, and the white spheres are sulfide. f Enlarged image of the white box “f” in c shows the intergrowth of rod-like ringwoodite, wadsleyite, and pyroxene in the matrix and the polycrystalline ringwoodite fragment. The small white grains are sulfide. Other abbreviations are the same as above

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