Tectonic Evolution for the East Coast of Canada

The East Coast of Canada is typically split into three areas: the Nova Scotian margin within the south, the Newfoundland margin at the heart and eastern, and also the Labrador margin within the north (Figure 1). These margins formed in the past 200 million years given that supercontinent of Pangea rifted apart, first as North America separated from Africa after which because it separated from European countries and Greenland (Figure 2). These episodes of rifting thinned and heated the crust that is continental lithosphere, which in turn subsided to create a complex collection of marginal basins. Considerable amounts of sediment have actually since accumulated in these basins and created sources and traps for hydrocarbon deposits. Exploration task to locate and exploit these resources, primarily from seismic profiles and boreholes of history three decades, has led to the current manufacturing of oil off Newfoundland and gasoline off Nova Scotia. Exploration tasks of both commercial and systematic activities have additionally yielded a wealth of fundamental information which has had significantly enhanced our knowledge of the essential procedures of lithospheric wantmatures scam expansion and rifting that is continental have actually created these margins and their hydrocarbon resources.

Figure 1. Map of Eastern Canada with areas of Nova Scotian, Newfoundland and Labrador continental margin sections. Dashed lines give locations of Appalachian front side (AF) and Grenville Front (GF), which divide the continental areas into three major geological provinces.

This is the function of this paper that is brief summarize a few of these findings.

I am going to utilize recently available maps of total sediment thicknesses (Oakey and Stark, 1995) and marine gravity anomalies from satellite altimetry (Sandwell and Smith, 1997) to determine the many basins, plus some types of local seismic pages to illustrate structures of both sediment and crust. As clearly suggested by the maps and pages, the complex collection of sedimentary basins and their underlying cellar structures that type these continental margins expand over a rather wide transitional area. A sizable an element of the dense sediment deposits occur within the much much deeper water slope and increase basins in this change area. Brand New overseas research activity happens to be focussing on these deep water basins. If significant accumulations of fuel and oil are observed, it may basically move the long run focus associated with oil that is canadian fuel industry from west to east. My hope is the fact that results from all of these brand brand new endeavors, both commercial and systematic, might also continue steadily to play a crucial role in increasing our fundamental knowledge of just exactly how these transitional regions type.

Plate Reconstructions

Plate tectonic reconstructions for the North Atlantic area are constrained primarily by identifications of marine magnetic anomalies and major fracture areas that formed during the development of ocean crust (Figure 2; Coffin et al., 1992). Such reconstructions can help figure out the many years and pre-drift roles of margin conjugates (for example. Continental parts that have been when next to one another before subsequent creation of intervening ocean crust). This is really important for determining the pattern that is complete of by juxtaposition of crustal parts across both margin pairs. Needless to say, given that age and complexity of subsequent dish motions increases therefore will the doubt associated with the positions that are reconstructed.

Figure 2. Plate reconstructions that are tectonic the opening for the North Atlantic Ocean at 180 Ma, 130 Ma, 80 Ma, and 50 Ma. Dashed lines give locations of chosen sea-floor anomalies that are spreading. NFZ=Newfoundland Fracture Zone; AFZ=Azores Fracture Zone; GFZ=Charlie-Gibbs Fracture Zone; BTJ=Biscay Triple Junction; DS=Davis Strait (from Coffin et al., 1992).

The separation of North American and Eurasia formed the North Atlantic margins in five stages, beginning in the south and progressing to the north as defined by the reconstructions

  • North America separated from Africa to make the Scotian margin sometime before chron M29 (160 Ma).
  • North America separated from Iberia to create the Newfoundland that is southern margin before chron M3 (125 Ma).
  • The united states separated from European countries to create the Newfoundland that is northern margin after chron M0 (120 Ma).
  • North America separated from Greenland to make the Labrador margin sometime before chron 31 (70 Ma).
  • A stage that is final of divided Greenland from European countries beginning fleetingly before chron 24 (55 Ma).