pressure shadow

pressure shadow

[′presh·ər ‚shad·ō]
(petrology)
In structural petrology, an area adjoining a porphyroblast, characterized by a growth fabric rather than a deformation fabric, as seen in a section perpendicular to the b axis of the fabric. Also known as pressure fringe; strain shadow.
References in periodicals archive ?
This site represents a highly prospective zone for mineralisation where the anastomosing structure splays from the granite intrusive creating a structural pressure shadow area in ductile sedimentary units.
PRESSURE Shadow Health Secretary Andy Burnham said: "When hospitals are under so much pressure, it makes no sense to close walk-in centres.
The gold particles transported by the ancient river system are typically deposited in pressure shadows behind and below large cobbles and boulders.
Mica and ilmenite parallel to the regional foliation wrap around garnet, whereas quartz and scarce mica flakes occur in strain pressure shadows.
1]), developing strain pressure shadows and shearing away cleavage domes
1]), with quartz inclusions derived from strain pressure shadows