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

Auteurs-es

  • F. Fueten Department of Geology McMaster University, Hamilton, Ontario L8S4M1
  • P. M. Clifford Department of Geology McMaster University, Hamilton, Ontario L8S4M1
  • L. L. Pryer Department of Geology McMaster University, Hamilton, Ontario L8S4M1
  • J. H. Crocket Department of Geology McMaster University, Hamilton, Ontario L8S4M1
  • M. J. Thompson Department of Geology McMaster University, Hamilton, Ontario L8S4M1

DOI :

https://doi.org/10.4138/1596

Résumé

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. RÉSUMÉ L'accroieseaent de l'inégalité et la baisse des fluctuations des longs axes des grains de quartz, des lithons jusqu'aux zones de clivage, dans les métagrauwackes du groupe Méguma, indique une haueae de tension. Cette hausse de tension est attribute à la solution de pression pénétrante dans laquelle les grains de quartz sont tallés et donnent des sections presque rectangulaires dans les zones de clivage, comparé à leur profile irrégulier dans les lithons. Le raccourcissement, calculi à partlr d'un modèle de pression unidimensionnel, atteint des valeurs entre 60 et 702 dans les zones de clivage. Des valeurs comparables du raccourcissement sont calculées à 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 été supérime du système immédiate Cela exige des volumes d'eau d'un ordre de grandeur plus important que n'importe quel système inné d'eau vraissembable. Ce système de transport était un système dynamique qui comprenait la majorité du volume des roches. [Traduit par le journal]

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Publié-e

1986-04-01

Comment citer

Fueten, F., Clifford, P. M., Pryer, L. L., Crocket, J. H., & Thompson, M. J. (1986). Formation of Spaced Cleavage and Concurrent Mass Removal of Si02, Meguma Goup Metagreywackes, Goldenville, Nova Scotia. Atlantic Geoscience, 22(1). https://doi.org/10.4138/1596

Numéro

Vol. 22 No. 1 (1986)

Rubrique

Articles

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