Reconstructing the stratal geometry of latest Eocene to Oligocene sequences in New Jersey; resolving a patchwork distribution into a clear pattern of progradation

Author(s): Pekar, S. F.; Miller, K. G.; Kominz, M. A.
Author Affiliation(s): Primary:
Rutgers University, Department of Geological Sciences, Piscataway, NJ, United States
Other:
University of Utah, United States
Western Michigan University, United States
Volume Title: Onshore-offshore correlation of Cenozoic strata, western margin of North Atlantic
Volume Author(s): Harris, W. Burleigh, editor; Segall, Marylin P.
Source: Sedimentary Geology, 134(1-2), p.93-109; Geological Society of America, 1998 annual meeting , theme session on Onshore-offshore correlation of Cenozoic strata, western margin of North Atlantic, Toronto, ON, Canada, Oct. 26-29, 1998, edited by W. Burleigh Harris and Marylin P. Segall. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0037-0738 CODEN: SEGEBX
Note: In English. 35 refs.; illus., incl. sects.
Summary: Nine latest Eocene to Oligocene (34.2-23.9 Ma) sequences were identified and dated from eight sites situated on the onshore New Jersey Coastal Plain and nearshore region. These sequences show a patchy distribution, with more complete lower Oligocene sections updip and more complete upper Oligocene sections downdip. We projected these sequences onto a dip profile and reconstructed their original thicknesses and distributions by 2-D flexural backstripping. This demonstrated that depocenters migrated offshore during the Oligocene, indicating that the patchy distribution can be best explained by progradation of generally thin and spacially limited clinoforms over an Eocene carbonate ramp. During the late Eocene to Oligocene, the New Jersey passive margin underwent a major morphologic change. Reconstructions indicate that the margin was a relatively steeply dipping carbonate ramp (1:500 paleoslope gradient) during the Eocene and was transformed into a siliciclastic margin characterized by a gentler gradient of 1:1000 and prograding clinoforms by the Miocene. Clinoform progradation probably began during the latest Eocene. Increased sediment supply during the Oligocene resulted in the further progradation of sediments across the antecedent carbonate ramp. The heights of the clinoforms ranged from ∼20 m during the latest Eocene and earliest Oligocene to nearly 50 m during the late Oligocene. Most sediment accumulated within clinoform wedges, with little or no sediment being preserved behind the clinoform inflection point. Abstract Copyright (2000) Elsevier, B.V.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Aggradation; Algae; Atlantic Coastal Plain; Atlantic Ocean; Benthic taxa; Biofacies; Biostratigraphy; Cenozoic; Clastic rocks; Depositional environment; Distribution; Eocene; Foraminifera; Geometry; Geophysical profiles; Geophysical surveys; Invertebrata; Leg 150; Leg 174A; Lithofacies; Magnetostratigraphy; Microfossils; Nannofossils; New Jersey; North Atlantic; Northwest Atlantic; ODP Site 1073; ODP Site 902; ODP Site 903; ODP Site 906; Ocean Drilling Program; Oligocene; Paleogene; Plantae; Progradation; Protista; Reconstruction; Sandstone; Sedimentary rocks; Seismic profiles; Sequence stratigraphy; Surveys; Tertiary; United States; Upper Eocene
Coordinates: N391331 N391331 W0721633 W0721633
N385605 N385605 W0724622 W0724622
N385618 N385618 W0724902 W0724902
N385754 N385754 W0724600 W0724600
Record ID: 2000063940
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands