Continuing the New Jersey Mid-Atlantic Sea-Level Transect

Austin, J. A.; Christie-Blick,; Malone, Nessa

doi:10.2973/odp.pr.174a.1997

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…Much has been learned in the past 30 years as a result of scientific ocean drilling about the sedimentary response to eustasy and the role of eustatic fluctuations in the formation of seismic sequences (Miller et al, 1994;Mountain et al, 1994;Austin et al, 1998;Miller et al, 1998;Mountain et al, 2010;Fulthorpe et al, 2011). Our results expand on these findings.…”

Section: Discussionmentioning

confidence: 99%

“…In the Canterbury Basin, the Site U1352 location was chosen because it lacked evidence of channel-canyon incision and pelagic fossils are more abundant than beneath the shelf, providing better age control (Fulthorpe et al, 2011). New Jersey Site 1073 was selected because seismic data showed an especially thick and relatively complete sedimentary section, distal from submarine canyon drainage, in addition to the possibility of obtaining good age control (Austin et al, 1998). As a result of interactions between accommodation space and sediment supply, upper slopes on passive margins can be depositional, erosional, or undergo sediment bypass (Galloway, 1998).…”

Section: Slope Processesmentioning

confidence: 99%

“…Eocene to Holocene siliciclastic sediments of the Canterbury Basin, offshore eastern South Island, New Zealand were drilled by Integrated Ocean Drilling Program (IODP) Expedition 317 (Fulthorpe et al, 2011). Siliciclastic sediments of nearly the same age offshore New Jersey were drilled during Ocean Drilling Program (ODP) Legs 150 (Mountain, 1994), 150X (Miller et al, 1994), 174A (Austin et al, 1998), 174AX (Miller et al, 1998), and IODP Expedition 313 (Mountain et al, 2010). These two settings are similar in that both are passive margins with similar tectonic and subsidence histories and both are mid-latitude margins where siliciclastic sedimentation has been affected by glacio-eustasy ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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The sedimentary imprint of Pleistocene glacio-eustasy: Implications for global correlations of seismic sequences

et al. 2017

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We evaluate lithofacies, chronology, and seismic sequences from the Canterbury Basin, New Zealand passive continental slope (Integrated Ocean Drilling Program [IODP] Expedition 317 Site U1352 and environs) and compare this with slope sequences from the New Jersey passive margin. Our goal is to understand continental slope sedimentation in response to glacio-eustasy and test the concepts of sequence stratigraphy. High-resolution geochemical elemental and lithostratigraphic analyses were calibrated to a chronology constructed from benthic foramininferal oxygen isotopes for the past ~1.8 m.y. We identify lithofacies successions by their unique geochemical and lithologic signature and correlate them with marine isotope stages (MIS) at Milankovitch 100 k.y. (MIS 1-12) and 41 k.y. (MIS 13-63) periods. Eight seismic sequence boundaries (U13-U19) were identified from high-resolution multichannel seismic data, providing a seismic stratigraphic framework. Except for MIS 1-5 and MIS 54-55, there are 2-16 MIS stages and a comparable number of lithofacies contained within each seismic sequence, indicating that it took one to several glacio-eustatic cycles to build each seismic stratigraphic sequence. These findings support prior results obtained by the Ocean Drilling Program (ODP) Leg 174A on the New Jersey continental slope. On both margins, there is a strong correlation between seismic sequences, lithofacies, and MIS, thus linking them to glacio-eustasy. However, the correlation between MIS and seismic sequences is not one-to-one, and Pleistocene seismic sequences on the two margins are not synchronous. Local conditions, including differences in sedimentation rates and creation of accommodation space, strongly influenced sediment preservation at each location, revealing that high-frequency Pleistocene seismic sequences need not correlate globally.

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Section: Discussionmentioning

confidence: 99%

Section: Slope Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The sedimentary imprint of Pleistocene glacio-eustasy: Implications for global correlations of seismic sequences

et al. 2017

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“…The structural substrate of the PAP can be considered to be comparable to the New Jersey continental shelf in the USA in a morphological sense, but with subtle differences as the New Jersey shelf was ice-rafted at the time of the LGM (Duncan, 2000) which gives it a bias towards younger strata (e.g. Emery and Uchupi, 1984;Austin et al, 1998). The PAP therefore provides a unique opportunity to correlate depositional events to palaeoenvironments of relevance to the Pleistocene.…”

Section: Global Relevance Of the Stratigraphy Of The Palaeo-agulhas Pmentioning

confidence: 99%

Seismic stratigraphy of the broad, low-gradient continental shelf of the Palaeo-Agulhas Plain, South Africa

Cawthra

Frenzel

Hahn

et al. 2019

Preprint

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The continental shelf of the Palaeo-Agulhas Plain (PAP) is scattered with Pleistocene deposits with subdued topography. Their exaggerated lateral extension is the expression of a flat underlying substrate and availability of accommodation space, depositional processes and response to glacio-eustatic sea-level change have influenced deposition and distribution of these units. We present new results for the upper ~30 m (up to ~200 ka) of the stratigraphic record in this area and show that this shelf offers the opportunity to examine the response of a stable tectonic setting to the effects of sea-level change. This paper presents the results of extensive sub-bottom profiling surveys and chronostratigraphic investigations from marine sediment vibracores. Radiocarbon and Optically stimulated Luminescence dates are integrated into a seismic stratigraphic model composed of twenty Quaternary units, where two depositional sequences are bounded by shelf-wide unconformities. The upper sequence was cored where Pleistocene deposits were observed to be close to the seafloor and are draped in a thin veneer of marine shelf sediment and allow us to describe the environments of deposition of the PAP. The most pervasive stratigraphic pattern in these shelf deposits is made up of the depositional sequence remnant of the Falling Stage Systems Tract (FSST) forced regression from Marine Isotope Stage 5e–2. The other dominant stratigraphic group is the Transgressive Systems Tract (TST) associated with the Postglacial Marine Transgression. Surprisingly, the TST makes up an almost equal proportion of deposits in both sequences in the sedimentological record as the FSST, despite the shorter temporal span of the TST. The sub-bottom profiles were acquired on regional surveys extending from the Breede River in the west to Plettenberg Bay in the east, and to a maximum depth of 110 m below Mean Sea Level, with the exception of one ~200 m deep shelf-edge profile.

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“…Although drilling originally targeted shelf locations where seismic facies are best imaged (Miller and Mountain, 1994), safety considerations required initial drilling on the slope (ODP Leg 150; Mountain et al, 1994) and onshore (ODP Leg 150X;Miller et al, , 1996a. In 1997, drilling edged onto the outer continental shelf (ODP Leg 174A; Austin et al, 1998), targeting Late Neogene clinoforms (see Metzger et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Correlation of offshore seismic profiles with onshore New Jersey Miocene sediments

Monteverde

Miller

Mountain

2000

Sedimentary Geology

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The New Jersey passive continental margin records the interaction of sequences and sea-level, although previous studies linking seismically defined sequences, borehole control, and global d 18 O records were hindered by a seismic data gap on the inner-shelf. We describe new seismic data from the innermost New Jersey shelf that tie offshore seismic stratigraphy directly to onshore boreholes. These data link the onshore boreholes to existing seismic grids across the outer margin and to boreholes on the continental slope. Surfaces defined by age; facies, and log signature in the onshore boreholes at the base of sequences Kw2b, Kw2a, Kw1c, and Kw0 are now tied to seismic sequence boundaries m5s, m5.2s, m5.4s, and m6s, respectively, defined beneath the inner shelf. Sequence boundaries recognized in onshore boreholes and inner shelf seismic profiles apparently correlate with reflections m5, m5.2, m5.4, and m6, respectively, that were dated at slope boreholes during ODP Leg 150. We now recognize an additional sequence boundary beneath the shelf that we name m5.5s and correlate to the base of the onshore sequence Kw1b. The new seismic data image prograding Oligocene clinoforms beneath the inner shelf, consistent with the results from onshore boreholes. A land-based seismic profile crossing the Island Beach borehole reveals reflector geometries that we tie to Lower Miocene litho-and bio-facies in this borehole. These land-based seismic profiles image well-defined sequence boundaries, onlap and downlap truncations that correlate to Transgressive Systems Tracts (TST) and Highstand Systems Tracts (HST) identified in boreholes. Preliminary analysis of CH0698 data continues these system tract delineations across the inner shelf. The CH0698 seismic profiles tie seismically defined sequence boundaries with sequences identified by lithiologic and paleontologic criteria. Both can now be related to global d 18 O increases and attendant glacioeustatic lowerings. This integration of core, log, and seismic character of mid-Tertiary sediments across the width of the New Jersey margin is a major step in the longstanding effort to evaluate the impact of glacioeustasy on siliciclastic sediments of a passive continental margin.

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Continuing the New Jersey Mid-Atlantic Sea-Level Transect

Cited by 5 publications

References 21 publications

The sedimentary imprint of Pleistocene glacio-eustasy: Implications for global correlations of seismic sequences

The sedimentary imprint of Pleistocene glacio-eustasy: Implications for global correlations of seismic sequences

Seismic stratigraphy of the broad, low-gradient continental shelf of the Palaeo-Agulhas Plain, South Africa

Correlation of offshore seismic profiles with onshore New Jersey Miocene sediments

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