-
differential compaction or
dissolution during sedimentation and lithification.
Ptygmatic:
Folds are chaotic,
random and disconnected.
Typical of
sedimentary slump...
- scale.
Migmatites often appear as tightly,
incoherently folded veins (
ptygmatic folds).
These form
segregations of leucosome, light-colored
granitic components...
-
Porphyroclastic Porphyroblastic Porphyritic texture; see also
porphyry Ptygmatic (folding); see
migmatite Quench textures; see obsidian,
tachylyte or aphanitic...
-
geological structures like anticline,
ripple marks, xenolith, scratch,
ptygmatic folds, fault, concretion, mudcracks, gneissose, boudin,
basalt columns...
-
graphitic and
siliceous cherts,
often finely laminated and
expressing ptygmatic folding post-sedimentation. It is
considered to be an
exhalative deposit...
- and
feldspar rich
greisenised pegmatite.
These veins are
typically ptygmatically folded. The
deposit is
typically shear hosted with the
morphology of...
