Computer Science
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esrv...29..267w&link_type=abstract
Earth Science Reviews, Volume 29, Issue 1-4, p. 267-281.
Computer Science
4
Scientific paper
Metamorphic or differentiated layering is best developed in low prograde metamorphic rocks such as slates and metaturbidites and is most easily recognised where it cuts a demonstrably earlier layering such as bedding. It commonly occurs as an axial plane foliation and typically comprises layers rich in phyllosilicates and opaque minerals alternating with layers rich in quartz or carbonate minerals. The phyllosilicate layers generally have the geometry of small shear zones offsetting the earlier foliation and are mostly thinner than the adjacent quartz or carbonate-rich layers. Both layers can vary in thickness from centimetres to microns and the structure is manifest in various forms including outcrop-scale layering and thin section-scale differentiated crenulation or slaty cleavage. In a given sequence of rocks there is generally a strong correlation between the coarseness of the layering and the coarseness of the rock. Such layering may develop by local redistribution of minerals or by localised addition or removal of some components to or from the rock. Either way, transport is believed to take place in solution and various models for the domainal localisation of the solution processes are discussed. Possible sources of the transporting fluid are considered and it is concluded that the most likely source in general is connate water subducted below the deforming, differentiating rock body.
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