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A long history of dextral transcurrent shear on the Cobequid-Chedabucto Fault System is indicated by structures in Meguma Zone phyllite and granite, and late veins, which outcrop close to the present Chedabucto Fault trace. The phyllite deformed first upon collision of Meguma with Avalonia during the Acadian Orogeny, and progressively since that time by ductile deformation mechanisms for almost the total deformational history of the rocks. Its foliation is due to transposition and dynamic recrystallization. Granite vas intruded syntectonically, as shown by contact oetamorphic formation of syntectonic porphyroblasts in the phylllte which are rotated, and progressive development of an inhomogeneous shear zone foliation towards the phyllite-granite contact. This foliation is approximately parallel to that developed in the phyllite. Quartz veins, which overprint all earlier structures, were deformed and accomodated by ductile mechanisms while being rotated in the continued progressive dextral shear regime.   RESUME  Une longue histoire de cisaillent transversale dextrale, sur les systemes de failles Cobequid-chedabucto, est indlque par des structures dans les phylites et les granites Meguma et les jeunes veines qui affleurent pres de la trace de la faille Chedabucto actuelle. La phylite c'est d'abord deforme a la suite de la collision entre Meguma et Avalonia pendant l'orogenese Acadienne, et depuis par des mecanismes progressifs de deformation ductile pendant presque toute la duree de l'histoire deformationelle des roches. Sa foliation est attribute a la transposition et a la recristalisation dynamique. Le granite a ete penetre syntectoniquement, comme le demontre la formation de porphyroblastes syntectoniques par moyen de metamorphisme de contact, dans les phylites retournees, et par le developpement progressif d'une foliation de zone de cisaillement inhomogene vers le contact phylite-granite. Cette foliation est plus ou mollis paralelle a celle qui est developpee dans la phylite. Des veines de quartz, qui surimpose toutes les structures precedences, ont ete deformees et accomodees par des mecanismes ductile, pendant qu'elles etaitant retournees par le regime progressif de cisaillement dextral  [Traduit par le journal]

Structural Study of Highly Deformed Meguma Phyllite and Granite Vicinity of White Head Village, S.E. Nova Scotia