Tectono-Stratigraphy of the Passive Margin Off Nova Scotia
Published:January 01, 1989
H.J. Welsink, J.D. Dwyer, R.J. Knight, 1989. "Tectono-Stratigraphy of the Passive Margin Off Nova Scotia", Extensional Tectonics and Stratigraphy of the North Atlantic Margins, A. J. Tankard, H. R. Balkwill
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The tectonic evolution of the Nova Scotian pas-sive margin includes a Late Triassic-Early Jurassic rift phase and two major episodes of postrift subsi-dence spanning Jurassic to early Tertiary time. Rifting resulted in two classes of extensional basins characterized by opposite polarities of basin- forming faults, and different levels of crustal detachment. Episodic passive-margin development is recorded by unconformity-bounded sequences that reflect differences in depositional systems and distribution of sedimentary facies. Seismic- stratigraphic sequences, separated by unconformi-ties, match these cycles of rift and postrift subsidence, and reflect major reorganizations of oceanic plates.
Transfer fault zones accommodate four extensional tracts that are characterized by different extensional and postrift subsidence. The Sable extensional tract became the major postrift depocen- ter, as localized drainage patterns along its eastern edge fed elastics into Sable basin. Postrift structural modifications include seaward-dipping detachments within the sedimentary cover, as well as salt mobility. The combined effect of increased subsidence, structurally controlled dispersal systems, and postrift faulting resulted in the accumulation of hydrocarbons in Sable basin.
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Extensional Tectonics and Stratigraphy of the North Atlantic Margins
Stimulated by the wealth of frontier exploration data and deep seismic surveys about the North Atlantic margins, this publication was crafted to provide a comprehensive analysis of North Atlantic extension. The 40 papers in this volume are divided into 6 sections: concepts, North Atlantic perspectives, North American margins, European-African margins, North Sea and Barents Shelf, and analogs. This book is concerned primarily with the circum-North Atlantic data base. It is largely biased toward presentation and interpretation of data rather than being model driven. The book includes comparative stratigraphic columns for basins of the North Atlantic margins.