Elsevier

Tectonophysics

Volume 187, Issues 1–3, 20 February 1991, Pages 117-134
Tectonophysics

Syntheses and model
Anatomy of North America: thematic geologic portrayals of the continent

https://doi.org/10.1016/0040-1951(91)90416-PGet rights and content

Abstract

Six thematic tectonic maps are used to analyse the makeup of the North American continent. Themes are:

  • 1.

    (1) major tectonic elements of the continent

  • 2.

    (2) time of last major deformation

  • 3.

    (3) time of first major deformation

  • 4.

    (4) miogeoclines and terranes by kindred

  • 5.

    (5) suture zones and terrane boundaries by age, and

  • 6.

    (6) time of accretion.

Features illustrated include distribution of orogenic belts and their extensions beneath cover sequences to the continental edge, contrast between juvenile and reworked crust in orogenic belts, geometry of ancient continental margins, distribution and classification of accreted terranes, geometry of suture zones and courses of ancient oceans, and how the continent evolved from an assemblage of Archean minicontinents to its present configuration. It is suggested that essentially similar plate tectonic processes controlled continental breakup and assembly from the Archean onwards, albeit with gradual increase in size of continental lithospheric plates and quantitative change in other parameters such as heatflow and character of the mantle.

References (52)

  • J.H. Allaart

    Ketilidian mobile belt in South Greenland

  • M.E. Bickford et al.

    Proterozoic history of the midcontinent region of North America

    Geology

    (1986)
  • R.L. Brown et al.

    An ensimatic island arc and ocean closure in the Grenville Province of southeastern Ontario, Canada

    Geosci. Can.

    (1975)
  • K.D. Card et al.

    DNAG No. 1. Subdivisions of the Superior Province of the Canadian Shield

    Geosci. Can.

    (1986)
  • C. Chauvel et al.

    Formation of Canadian 1.9 Ga old continental crust

    Can. J. Earth Sci.

    (1987)
  • S.P. Colman-Sadd et al.

    A tectonic window in central Newfoundland? Geological evidence that the Appalachian Dunnage Zone may be allochthonous

    Can. J. Earth Sci.

    (1984)
  • K.C. Condie

    Plate-tectonic model for Proterozoic continental accretion in the southwestern United States

    Geology

    (1982)
  • P.J. Coney et al.

    Cordilleran suspect terranes

    Nature

    (1980)
  • F.A. Cook et al.

    Thin-skinned tectonics in the crystalline southern Appalachians; COCORP seismic-reflection profiling of the Blue Ridge and Piedmont

    Geology

    (1979)
  • A. Davidson

    New interpretations in the southwestern Grenville Province

  • E.M. Duebendorfer et al.

    Proterozoic accretionary tectonics at the southern margin of the Archean Wyoming craton

    Geol. Soc. Am. Bull.

    (1987)
  • W.F. Fahrig et al.

    The tectonic significance of some basic dyke swarms in the Canadian Superior Province with special reference to the geochemistry and paleomagnetism of the Mistassini swarm, Quebec, Canada

    Can. J. Earth Sci.

    (1986)
  • J.R. Garrison

    Coal Creek serpentinite, Llano Uplift, Texas: a fragment of an incomplete Precambrian ophiolite

    Geology

    (1981)
  • C.F. Gower et al.

    Pre-Grenvillian and Grenvillian lithotectonic regions in eastern Labrador—correlations with the Sveconorwegian Orogenic Belt in Sweden

    Can. J. Earth Sci.

    (1984)
  • C.F. Gower et al.

    Proterozoic evolution of the Grenville Province and adjacent Makkovik Province in eastern-central Labrador

  • A.G. Green et al.

    Evolution of Proterozoic terranes beneath the Williston Basin

    Geology

    (1985)
  • P.P. Hoffman

    Geology, Northern Internides of Wopmay Orogen, District of Mackenzie, Northwest Territories

    Geol., Surv. Can., Map 1576A, scale 1:250,000

    (1984)
  • P.F. Hoffman

    Is the Cape Smith Belt (northern Quebec) a klippe?

    Can. J. Earth Sci.

    (1985)
  • P.F. Hoffman

    Crustal accretion in a 2.7-2.5 Ga “Granite-Greenstone” Terrane, Slave Province, NWT: a prograding trench-arc system?

    Geol. Assoc. Can., Progr. Abstr.

    (1986)
  • P.F. Hoffman

    s the Thelon Front (NWT) a suture?

    Geol. Assoc. Can., Progr. Abstr.

    (1986)
  • P.F. Hoffman

    Birth of a craton

    Geol. Assoc. Can., Progr. Abstr.

    (1987)
  • P.F. Hoffman

    United Plates of America, the birth of a craton

    Annu. Rev. Earth Planet. Sci.

    (1988)
  • P.F. Hoffman

    Continental transform tectonics: Great Slave Lake shear zone (ca. 1.9 Ga), northwest Canada

    Geology

    (1989)
  • P.F. Hoffman et al.

    Short-lived 1.9 Ga continental margin and its destruction, Wopmay orogen, northwest Canada

    Geology

    (1984)
  • Hoffman, P.F. et al., in prep. Tectonic map of the Canadian Shield. Geological Survey of...
  • D.G. Howell et al.

    Preliminary tectonostratigraphic terrane map of the Circum-Pacific region

    (1985)
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