Discussion
In an S-tectonite the strain ellipsoid will be :
Answer: C
In an S-tectonite the strain ellipsoid is Oblate finite strain.
Tectonites are classed by their dominant fabric. An S-tectonite has a strong planar fabric (foliation) and little or no lineation, which records flattening strain: the finite strain ellipsoid is oblate, shaped like a pancake, with X roughly equal to Y and both much greater than Z.
A prolate ellipsoid (cigar-shaped) gives an L-tectonite with a dominant lineation, and plane strain gives an LS-tectonite with both fabrics. 'Infinite plane strain' is not a real category.
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