A weakly developed crenulation cleavage is defined by fine grained muscovite.
Fine grained biotite and muscovite define the main crenulation cleavage. Foliations in the rock are visible at the mesoscopic scale.
Well developed muscovite psuedomorphs are numerous in the rocks and arranged in the direction of crenulation cleavages in the matrix.
6c) are deforming the Chanic cleavage ([S.sub.1]) and often are accompanied by a crenulation cleavage ([S.sub.2]).
In slate horizons, the smooth S2 crenulation cleavage is defined by parallel and discrete domains with accumulation of opaque minerals (Fig.
The second phase of deformation ([D.sub.2]) formed open to tight [F.sub.2] folds of bedding, [S.sub.1A] and S.sub.1B] and an axial planar [S.sub.2] crenulation cleavage enhanced by pressure solution.
7d, Table 1) with an axial planar crenulation cleavage is present, along with sinistral tension gashes and sheath folds.
(iii) Crenulations: effect of crenulation cleavage
on the main schistosity planes.
The slaty cleavage (S1) is usually crenulated and sometimes develops a crenulation cleavage (S2).
In the same rocks, the S2 is a spaced crenulation cleavage related with smaller-scale folds of WNW and ESE vergence.
The formation of crenulation cleavage. Journal of Geological Society of London, 132, pp.
Investigations on the mechanical significance of crenulation cleavage. Tectonophysics, 58, pp.