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Increasing inequancy and decreasing fluctuation of long axes of quartz grains from lithons to cleavage zones in Heguna Group metagreywackes indicate an increase in strain. This strain increase is best ascribed to pervasive pressure solution in which quartz grains are trimmed to yield nearly rectangular sections in cleavage zones, as compared to their irregular outlines in lithons. Shortening calculated from a one-dimensional strain model reaches 60-7OZ in cleavage zones. Comparable values of shortening are calculated from modal analyses, and from chemical analyses of cleavages and lithons.  The Implication of such shortening is that about ten percent of all the quartz in the original rock has been removed from the immediate system. This demands volumes of water about one order of magnitude greater than any likely content of connate water. The transport system was a dynamic one, involving most of the rock volume.   RESUME  L'accroieseaent de l'inegalite et la baisse des fluctuations des longs axes des grains de quartz, des lithons jusqu'aux zones de clivage, dans les metagrauwackes du groupe Meguma, indique une haueae de tension. Cette hausse de tension est attribute a la solution de pression penetrante dans laquelle les grains de quartz sont talles et donnent des sections presque rectangulaires dans les zones de clivage, compare a leur profile irregulier dans les lithons. Le raccourcissement, calculi a partlr d'un modele de pression unidimensionnel, atteint des valeurs entre 60 et 702 dans les zones de clivage. Des valeurs comparables du raccourcissement sont calculees a partlr d'analyses modales, et d'analyses chimiques des clivages et des lithons.  L'implicatlon de ce raccourclssement est qu'environ dix pourcent de tout le quartz de la roche originaire, a ete superime du systeme immediate Cela exige des volumes d'eau d'un ordre de grandeur plus important que n'importe quel systeme inne d'eau vraissembable. Ce systeme de transport etait un systeme dynamique qui comprenait la majorite du volume des roches.  [Traduit par le journal]

Formation of Spaced Cleavage and Concurrent Mass Removal of Si02, Meguma Goup Metagreywackes, Goldenville, Nova Scotia