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This paper presents preliminary results from field observations on the Lower Silurian La Vieille Formation in north-east New Brunswick regarding the extent of early hydrothermal dolomitization, a critical element for assessing hydrocarbon potential. Six stratigraphic sections of the Formation were carefully examined for facies architecture and evidence of hydrothermal alteration of limestone facies. Features of interest included early fractures, brecciation & dissolution associated with early fractures, large-scale collapse of sections, fracture-filling cements, and synsedimentary tectonic instability. The findings provide critical information pertinent to the hydrocarbon reservoir potential of these rocks.
This report briefly describes the nature, extent, and age of marine deposits near the head of Wager Bay on the west side of Hudson Bay, Nunavut. The main focus is on determination of the marine limit, or the highest elevation reached by the post-glacial sea. The elevation of the marine limit yields information about the extent of inundation by post-glacial seas, the amount of post-glacial crustal deformation, and the elevation below which the geochemical composition of glacial deposits may have been altered by marine processes or by mixing of glacial materials with marine sediments. Marine limit positions were determined by recording the elevations of: raised deltas that indicate where meltwater streams & overflow channels from glacial lakes fed in to high-level water bodies; ice-contact deltas; and trimlines where the uppermost limit of wave erosion of glacial deposits is prominent.
Dans le cadre de la partie 2 du projet sur les ressources énergétiques des Appalaches de l'Initiative géoscientifique ciblée, nous avons utilisé un étinceleur pour obtenir plus de 3000 km de profils sismiques monotrace à haute résolution dans l'estuaire du Saint-Laurent. Ces données, recueillies en 2003 et 2004 en vue de cartographier des séries sédimentaires à de faibles profondeurs, contiennent de nombreux artéfacts, par exemple des réflexions multiples de courte et de longue périodes. Afin de fournir dans la mesure du possible des profils sans artéfacts, nous avons établi un processus à 10 étapes qui a servi pour le traitement des 55 profils obtenus. Ce processus comporte un algorithme de déconvolution trace par trace qui permet de comprimer la signature de la source. Les profils traités fournissent une image sismique améliorée qui permet de sélectionner avec précision les réflecteurs stratigraphiques clés.
A well-exposed section about 250 metres wide below the high water line of the Jennings River, Teslin Lake map area in northern British Columbia shows part of the Teslin Fault and provides an opportunity to constrain the fault's kinematic history by direct ground observations. This report describes preliminary structural observations of this section of the Teslin Fault, including the rock types involved, mylonitic & ultramylonitic structures, and deformation. Indications of two main episodes of shearing are discussed.