Devil's Vanga - Serramazzoni (App. Modena) - Devil's Charter Seismological
These structures are found in metamorphic rocks.
The foliations by CRENULATA are formed by folds and chevron folds developed in a pre-existing foliation. The new cuts foliation trasversalente the previous one (in some cases showing the cleavage planes).
Foliation by CRENULATA symmetrical folds of the lesion are symmetrical and the foliation is represented by CRENULATA hips;
Foliation by CRENULATA asymmetric: the lesion is asymmetric folds and the foliation by CRENULATA is only represented by side;
The old foliation is preserved within the microlithos, both as a hinge CRENULATA symmetrical and as one of the two sides of asymmetric CRENULATA.
The foliation due to tectonic stress, can be a cleavage by CRENULATA (crenulation clevage) where you can recognize the following two domains:
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M-domaines
: (domain mica) mica minerli formed by forming a cleavage domain; QF-domaines : (domain quartz-feldspar) minerli made of quartz and feldspar (microlithon)
E 'can be distinguished:
- foliation (cleavage) from zonal CRENULATA
- : the orientation of the ore varies continuously from the flat microlithon the domain of cleavage and that cleavage within the domain of the minerals are not strictly flat cleavage parallel to the new domain; Foliation (cleavage) from discrete CRENULATA
- : there is a sharp reversal of orientation that characterizes the boundary between the domain and the cleavage microlithon.
In Anglo-Saxon terminology is spoken almost exclusively of cleavage and foliation. The term foliation is used in Italian terminology. Bibliography
Davis GH, Reynolds SJ. (1996); Structural geology of rocks and regions . JOHN WILEY & SONS Ed
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