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Fig. 5


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Representative micrographs of Type II samples: (1) representative example of the sapphirine-bearing microbreccias (cross-polarized light; sample BCOR 68a). Note the dominant highly fractured monomineralic clasts and the calcitic cement. One fractured polymineralic clast (sapphirine + gedrite) appears in the upper central part of the picture (redrawn in the inset); (2) plurimillimetric monomineralic clast of gedrite fragmented with very few displacements between the debris (cross-polarized light; sample BCOR 68a); (3) sapphirine crystal showing corrosion gulfs infilled with calcite, surrounded by kinked vermiculite crystals displaying open cleavages (cross-polarized light; sample BCOR 68b); (4) a highly-fractured subhedral anthophyllite crystal, with calcite infill (plane-polarized light; sample BCOR 72); (5) and (6) polymineralic clasts showing the intergrowth relationships between sapphirine and gedrite (cross-polarized light; sample BCOR 68a). Abbreviations from Whitney and Evans (2010).

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