--> Abstract: Reconstruction of Sequence Evolution Using Two-Dimensional Backstripping, by D. J. Reynolds and M. S. Steckler; #90987 (1993).

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REYNOLDS, DAVID J., and MICHAEL S. STECKLER, Lamont Doherty Geological Observatory of Columbia University, Palisades, NY

ABSTRACT: Reconstruction of Sequence Evolution Using Two-Dimensional Backstripping

We have used a two-dimensional backstripping routine to reconstruct sequence geometry within the Tertiary section of the Baltimore Canyon region, offshore New Jersey. By including horizons interpreted from seismic data extending from the coastal plain and to the rise, we are able to constrain the sequential development of sequence geometries and estimate paleobathymetry across the margin. Following a sediment flux increase in the Late Tertiary, the margin began to prograde. During the Miocene, three successive stationary shelf margins were established. These margins were separated by a series of aggradational sequences which accumulated a large volume of sediment seaward of the shelf margin break. These aggradational sequences were in turn followed by a rapid progradation and establis ment of a new shelf margin tens of kilometers seaward of the older set. The cause of this alternation in geometry may be related to sediment stability and supply rather than sea level change. Our backstripping also illustrates the deformation of sequences due to compaction. We examine this deformation using a forward model which demonstrates the importance of transient structures created by lateral variations in compaction. Our forward models also suggest that the Miocene systems tracts are dominantly lowstands, and that the sequence boundaries were formed early in the sea level fall. The ideas presented here will be tested by Ocean Drilling Program Leg 150.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.