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Geophysics of Atlantic North America

  • Chapter
The Geology of Continental Margins

Abstract

On the basis of geophysical data, the East Coast margin can be divided into three structural provinces which are largely unrelated to the shelf-sloperise morphological provinces. The eastern province extends from the abyssal plains to the magnetic slope anomaly. The central province centers on the outer shelf. Its seaward boundary is the magnetic slope anomaly, which in the northern area lies well out over the continental rise. Model calculations are consistent with the view that the anomaly marks the edge of oceanic crust. The western boundary is ill-defined but lies somewhere beneath the inner shelf. The central province is characterized by great mobility. Deeply subsided fault-block basins in this belt are filled with huge thicknesses of sediments, the basal sequences of which are at least as old as Late Triassic-Early Jurassic. Roughly the lower half of the section in these basins is of high seismic velocity and has previously been interpreted as basement. The western province, which included much of the Appalachian crystalline belt, is a zone of relatively minor vertical mobility and thin sediments. The subsidence of the margin can be seen as the result of a regional rise of the aesthenosphere prior to rifting, which partially followed the Appalachian lithospheric grain, and which was concentrated in the central province.

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Authors
  1. M. A. Mayhew
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Editors and Affiliations

  1. Mobil Oil Corporation, 221 Nassau Street, 08540, Princeton, New Jersey, USA

    Creighton A. Burk (Chief Geologist) (Chief Geologist)

  2. Department of Earth Sciences, Dartmouth College, 03755, Hanover, New Hampshire, USA

    Charles L. Drake (Professor of Earth Sciences) (Professor of Earth Sciences)

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Mayhew, M.A. (1974). Geophysics of Atlantic North America. In: Burk, C.A., Drake, C.L. (eds) The Geology of Continental Margins. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-01141-6_30

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  • DOI: https://doi.org/10.1007/978-3-662-01141-6_30

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