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• W1995477246 abstract "S OF PAPERS PRESENTED Diapirism of the Morin anorthosite; evidence from the petrofabrics o f quartz c-axes of surrounding granulites. C. Barraud and J. Mart ignole , D6par tement de G6ologie, Universit6 de Montr6al , C.P. 6128, Montr6al , P .Q. Canada H3C 3J7. Petrofabric analysis of quartz c-axes from supracrustal rocks in contact with the Morin anorthosite (Grenville Province) was used to establish the relationship between quartz microfabric and diapirism. Isotropic quartz fabric mainly occurs southwest of the anorthosite dome, in mesoperthite-bearing leucogranulites, close to the granite minimum and in granoblastic annealed granulites. Conversely, nonisotropic quartz fabric is interpreted as the result of stresses acting during or after the last crystallization or recrystallization. This fabric is characterized by a point maximum or a small girdle. The orientation of quartz c-axes is not related to the mesoscopic foliation, but tends to be oriented perpendicular to the contact of the Morin anorthosite. The absence of relationship between mesoscopic fabric and quartz axes suggests that the latter is due to a late strain. Inasmuch as quartz c-axes tend to be oriented according to the last strain increments, the radial strain pattern around the Morin anorthosite would be compatible with the ascent and spreading of the mass as a late event not followed by regional deformation and metamorphism. The presence of fairly large tracts of granulites with an almost isotropic quartz fabric shows that crystallization from anatectic melts or metamorphic recrystallization locally outlasted dynamic crystallization. Origin and deformation of the North Mokka anticline, a typical structure in the Western Eureka Sound fold belt, Axel Heiberg Island, Canadian Arctic. Jean van Berkel , Depar tment of Geology, Universi ty of Toronto , Toronto , Canada M5S 1A1. The North Mokka anticline on central eastern Axel Heiberg Island is one of numerous doubly-plunging anticlines in the Eureka Sound fold belt. Its southern nose is cut by a large second-order evaporite diapir, the Mokka Fiord diapir (Schwerdtner & Clark 1967). Structural evidence suggests that the anticline is not a buckle fold due to E-W compression (Thorsteinsson 1974) but a first-order diapiric ridge due to halokinesis (Trusheim 1960). The anticline comprises at least three coalescent domes that form a N-S chain. The middle dome has a teardrop shape with at, apex to the south, and contains a small second-order evaporite diapir in its core. A NNW-SSE to N-S trending fault with a steep westerly dip cuts the southern and middle domes and forms the southeastern contact of the Mokka Fiord diapir. It truncates the internal structure of the small diapir in the middle dome. The fault is regarded as a minor branch of the Stolz thrust zone, which trends NW-SE about 10 km southwest of the North Mokka anticline. Northeast and northwest trends in the Grenville Province-expressions of propagating shear-zones? N. G. Culshaw, Depar tment of Geology, University of Ottawa, Ottawa, Ontar io , Canada K1N 6N5. At the margins of ductile shear zones in the western Grenville Province, a fairly common feature is the juxtaposition of an unfolded foliation, bearing a down-dip stretching lineation, with an overor underlying zone of folding. Lineation in the unfolded foliation, often plunging moderately to the southeast, is commonly parallel to the fold axes. This feature may be present locally or on a regional scale. In the latter case large areas of NW-trending foliations may be truncated by the SE-dipping foliation of the shear zone, both areas bearing a moderately SE-plunging lineation. Ramsay & Allison (1979) have suggested that when a shear system is constrained in the Z direction, contraction may occur below the leading edge of a propagating ductile shear. If a passive layering, originally parallel to the shear plane, is introduced into their model, folds with their axes parallel to the stretching lineation may form in the zones of contraction. Consequently, when the shear plane dips moderately to the southeast parallel to the lineation, NW and NE trends may be formed simultaneously. Also the model predicts that locally, as the shear zone propagates, folds with NW-striking axial surfaces will be overprinted by those with NE-striking axial surfaces. Large-scale structural patterns in the central gneiss belt, Grenville Province of Ontario. A. Davidson, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontar io , Canada K I A 0E8. Curvilinear zones of layered gneiss in the central gneiss belt, Ontario Grenville Province, are moderately to gently dipping, more than 1 km thick, and continuous for scores of kilometres. On the map they surround, wholly or partly, domains with internally complex, smaller scale structure and distinctive lithologies and metamorphism. Regionally, NE-trending zones truncate structure to the northwest, NWtrending zones truncate underlying structure. Conventional concepts, namely basement/cover unconformities, discordant plutonic contacts, and simple fault systems, do not adequately explain domain juxtapositions. Relative displacement of adjacent crustal segments can account for the observed relationships." @default.
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• W1995477246 date "1983-01-01" @default.
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• W1995477246 title "Report on the second meeting of the Canadian Tectonics Group held on 23–24 October 1982 at Gravenhurst, near Toronto" @default.
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