At a time when 'textural' evidence is regarded as being 'obvious' (
. . . ) it becomes more and more difficult to find illustrations or
even descriptions of the arrangements of the various constituents
of 'traumatized' rocks. It is helpful in consequence to advise
geology students that the study of thin sections is not only
concerned with the identification of their mineral content. To do
so would mean they could not see the wood for the trees. Accurate
identification of the indi vidual minerals that form rocks is
fundamental in their description but the analysis of their textures
and habits is also essential. Study of textural features enforces
constraints upon the inter pretation of the origin and history of a
rock. The analysis of micro textures cannot and should never be an
aim in itself, out must be sup ported by qualitative and
quantitative correlations with theories of petrogenesis. The aim
here is to help the reader to bridge the gap between his
observations of rocks unqer the microscope and petrogenetic
theories. The habits or architectures of crystals in rocks may
resemble those studied by metallurgists and glass scientists.
Analysis of micro textures is undergoing change engendered by
comparisonS between manu factured and hence minerals. This can be
seen from the increased number of publications dealing with crystal
rowth or deformation processes at microscopic scales to which the
name of 'nanotectonics' has been applied."
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