Download PDF by Author B. Sander: An Introduction to the Study of Fabrics of Geological Bodies

By Author B. Sander

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Extra resources for An Introduction to the Study of Fabrics of Geological Bodies

Sample text

Chronological subdivision and the superimposition of other geological processes When we are concerned with the superimposition of tectonic deformations and metamorphism, the time concept must be handled j ust as critically as it was when first applied to appositional rocks; the statements which can be demonstrated by fabric characteristics refer to a defined space- and time-domain within a larger one and must not be extended to the whole without further evidence. For example, the events of a tectonically modified regional contactmetamorphism may not be operative throughout the region of interest, either simultaneously or in the same manner at every part of the region.

If, for example, a granular rock body, in which under the given conditions the componental movement takes place from grain to grain, bends into a fold in the course of some days or hours, then this period of days or hours also includes the process of small relative displacements or the enactment of limited mechanical deformation of the grains in the fabric. The grains move against each other correspondingly slowly. The velocity of componental movement in such rocks, even with fairly rapid deformation of the whole, is correspondingly limited.

Nevertheless the same initial body is sheared out into the same final form in the same time. If, then, one or more minerals in the rock are mobile, so that they can dissolve within the intergranular and recrystallize, the slowness of componental movement becomes significant. It thereby becomes possible for solution and recrystallization, which need a certain minimum time, to play a role as intergranular and intragranular crystallization-movement in the fabric of grains which are in continuous, albeit very slow, movement against each other, and to some extent they may take the place of visible ruptural deformation of the fabric.

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