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all geography including DSDP/ODP Sites and Legs
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oxygen
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silicates
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silica minerals
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orthosilicates
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sheet silicates
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mica group
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Primary terms
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absolute age (15)
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Arctic region
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Greenland (1)
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Atlantic Ocean
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North Atlantic
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Baltimore Canyon (4)
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Bay of Fundy (2)
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Georges Bank basin (1)
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North Sea (4)
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Northwest Atlantic (9)
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Sable Island Bank (6)
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Scotian Shelf (106)
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South Atlantic
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Atlantic Ocean Islands
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bibliography (1)
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Canada
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Newfoundland and Labrador
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carbon
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Cenozoic
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Pleistocene
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upper Pleistocene
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upper Quaternary (1)
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Tertiary
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upper Neogene (1)
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upper Cenozoic (1)
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Invertebrata
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isotopes
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Cretaceous
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Logan Canyon Formation (6)
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Lower Cretaceous
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Aptian (2)
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Barremian (1)
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Missisauga Formation (6)
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Neocomian (1)
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Travis Peak Formation (1)
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Valanginian (2)
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Middle Cretaceous (1)
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Potomac Group (1)
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Lance Formation (1)
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Maestrichtian (1)
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Mesaverde Group (1)
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Senonian (1)
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Jurassic
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middle Liassic (1)
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Mic Mac Formation (2)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Scotian Shelf
Assessment of the effect of mass-transport deposits on fault propagation in Penobscot area, offshore Nova Scotia Available to Purchase
Abstract Three-dimensional (3D) seismic data and well logs from the Penobscot area, located within the Scotian Basin offshore Nova Scotia, are used to assess the role of mass-transport deposits (MTDs) on fault propagation. Four MTDs characterized by chaotic seismic facies were mapped, with the earliest hosted by the Late Cretaceous–Recent Dawson Canyon Formation and latest three hosted by the Banquereau Formation. Two types of faults were also mapped. R-faults are regional faults that cut across all the interpreted MTDs in the study area, while P-faults are polygonal faults that cut across MTDs 2 and 3 but tip out at the basal surfaces of MTDs 4 and 2. Representative seismic profiles and isochron maps of the MTDs and throw–depth ( T–z ) and throw–distance ( T–x ) plots allows us to distinguish the families and propagation history of the faults. Our results show that fault propagation is not affected by the presence or thickness variation of MTDs, and is also unaffected by lithological contrast in the Penobscot area of the Nova Scotian Shelf.
Reservoir Characterization and Distribution in Rift and Synrift Basin Fill—Examples from the Triassic Fundy Basin and Orpheus Graben of the Scotian Margin Available to Purchase
Abstract Reactivated Paleozoic faults provided accommodation of rift and synrift basin fill in the Triassic Fundy Basin and Orpheus Graben of the Scotian Margin. Age data (Williams, 1985) suggests that the Minas Subbasin opened as early as the Anisian (242–247.2 ma) while the Orpheus Graben opened as early as the Rhaetian (201.3–208.5 ma). The Minas Fault Zone (MFZ) defines the boundary between the Avalon and Meguma terranes in the Canadian Appalachians and is exposed along mainland Nova Scotia (Murphy et al. , 2011). This series of faults mark the northern flank of the Minas subbasin (Fundy basin) and Orpheus graben (Scotian basin), and were reactivated during Mesozoic regional extension. Faults nearest the highlands accommodated the coarsest material (alluvial) while faults toward the basin center accommodated relatively finer grained fluvial, aeolian, and lacustrine sediments (Wade and MacLean, 1990 ; Leleu et al. , 2009). The Wolfville Formation comprises alluvial facies and generally fines upward into the Blomidon Formation aeolian sediments (Fig. 1), only found along the northern boundary of the basin. Is this facies present due to local deposition within the Minas subbasin in an arid, dry zone or do aeolian sediments persist along all footwalls of eastern North American synrift basins? Figure 1. Schematic transect through the Minas Subbasin showing the structural and stratigraphic elements of this basin during rifting. Alluvial fan facies are found along the northern faulted flank of the basin, with minor occurrence of Aeolian facies. Fluvial facies are found along the entirety of the basin. Lacustrine facies are also found along the entirety of the basin but are dominantly deposited in the central areas of the basin. The Orpheus graben is an oblique trending Mesozoic extensional basin. At outcrop on the western edge of the basin, facies comprise fine to coarse-grained sandstone containing pebble to cobble clasts and having a minor mud and conglomeratic facies. These are interpreted to have been deposited in an alluvial braided channel complex nearest the mouth of the river system (Tanner and Brown, 1999). To the east, more distal facies representing evaporites, playa lake and marginal marine environments are present in cores of the Eurydice Formation and represent initial opening of the Atlantic Ocean. Paleoflow indicators suggest axial rivers once existed between the two basins along the MFZ (Tanner and Brown, 1999 ; Leleu et al. , 2009). Could the “Broad Terrane Hypothesis” of Russell (1879) be applicable? Was there a single connected basin which was separated into two subbasins through uplift and erosion of conjoining strata (alluvial deposits along the axial trend of the MFZ)? During basin inversion (Withjack et al. , 1995 ; Withjack et al ., 2009 ; Withjack et al ., 1998) sediments deposited along the Minas Fault Zone have been uplifted and eroded. This is most likely the reason for the lack of alluvial facies present along the northern edge (footwall) of the Minas Subbasin. Facies associations of surface and subsurface synrift sediments are being characterized to discern sediment distribution patterns and sediment provenance (outcrop, thin section) and subsurface (core, cuttings, thin section).