Glacioisostatic influences on Virginia's late Pleistocene coastal plain deposits

Scott, Timothy W.; Swift, Donald J. P.; Whittecar, G. Richard; Brook, George A.

doi:10.1016/j.geomorph.2009.10.017

Cited by 17 publications

(8 citation statements)

References 57 publications

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“…The presence of MIS 3 estuarine deposits near today's sea level confirms the effects of GIA over long timescales for the Blackwater National Wildlife Refuge and supports similar interpretations within the greater Chesapeake Bay region. The elevations of MIS 3 estuarine deposits generally decrease from the Central Delmarva Peninsula southward to North Carolina (Scott et al, 2010); dated, emerged MIS 3 estuarine deposits are not found south of North Carolina. While the maximum elevations of MIS 3 deposits vary (GSA Supplemental Data Fig.…”

Section: Discussionmentioning

confidence: 90%

“…from Lisiecki and Raymo (2005) and Thompson and Goldstein (2006), respectively. The glacioisostatic (land surface) curve (after Scott et al, 2010) is based on ages produced for shoreline deposits in the mid-Atlantic region and illustrates how land-surface elevation change induced by glacio-hydro-isostatic adjustment can account for submergence of the Chesapeake Bay region when eustatic sea level was much lower than present. VPDB-Vienna Pee Dee Belemnite.…”

Section: Study Site and Methodsmentioning

confidence: 99%

“…The presence of near-shore MIS 3 deposits near present sea level suggests an alternative sea-level history for the region, one that implies forebulge uplift of at least 40 m since the time of deposition. This uplift has been attributed to growth of the last glacial maximum (LGM; MIS 2) forebulge (Pavich et al, 2006;Mallinson et al, 2008;Scott et al, 2010;Parham et al, 2013) that remains uplifted out of isostatic equilibrium (Potter and Lambeck, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Pleistocene relative sea levels in the Chesapeake Bay region and their implications for the next century

DeJong¹,

Bierman²,

Newell³

et al. 2015

GSAT

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Today, relative sea-level rise (3.4 mm/yr) is faster in the Chesapeake Bay region than any other location on the Atlantic coast of North America, and twice the global average eustatic rate (1.7 mm/yr). Dated interglacial deposits suggest that relative sea levels in the Chesapeake Bay region deviate from global trends over a range of timescales. Glacio-isostatic adjustment of the land surface from loading and unloading of continental ice is likely responsible for these deviations, but our understanding of the scale and timeframe over which isostatic response operates in this region remains incomplete because dated sea-level proxies are mostly limited to the Holocene and to deposits 80 ka or older.To better understand glacio-isostatic control over past and present relative sea level, we applied a suite of dating methods to the stratigraphy of the Blackwater National Wildlife Refuge, one of the most rapidly subsiding and lowest-elevation surfaces bordering Chesapeake Bay. Data indicate that the region was submerged at least for portions of marine isotope stage (MIS) 3 (ca. 60-30 ka), although multiple proxies suggest that global sea level was 40-80 m lower than present. Today MIS 3 deposits are above sea level because they were raised by the Last Glacial Maximum forebulge, but decay of that same forebulge is causing ongoing subsidence. These results suggest that glacio-isostasy controlled relative sea level in the mid-Atlantic region for tens of thousands of years following retreat of the Laurentide Ice Sheet and continues to influence relative sea level in the region. Thus, isostatically driven subsidence of the Chesapeake Bay region will continue for millennia, exacerbating the effects of global sea-level rise and impacting the region's large population centers and valuable coastal natural resources.

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Section: Discussionmentioning

confidence: 90%

Section: Study Site and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pleistocene relative sea levels in the Chesapeake Bay region and their implications for the next century

DeJong¹,

Bierman²,

Newell³

et al. 2015

GSAT

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“…On the eastern side of Chesapeake Bay preliminary evidence suggests a similar pattern Scott et al (2010). notes evidence of glacioisostasy within stratigraphic units on the Delmarva Peninsula.…”

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confidence: 78%

Synthesis on Quaternary aeolian research in the unglaciated eastern United States

Markewich

Litwin

Wysocki³

et al. 2015

Aeolian Research

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“…, 2004, 2010; Scott, 2006; Mallinson et al. , 2008; Moore, 2009; Scott et al. , 2010) (Table 3) to develop the stratigraphy of the region.…”

Section: Geochronologymentioning

confidence: 99%

Quaternary coastal lithofacies, sequence development and stratigraphy in a passive margin setting, North Carolina and Virginia, USA

Parham¹,

Riggs²,

Culver³

et al. 2012

Sedimentology

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Lithofacies analysis is fundamental to unravelling the succession of depositional environments associated with sea‐level fluctuations. These successions and their timing are often poorly understood. This report defines lithofacies encountered within the north‐eastern North Carolina and south‐eastern Virginia Quaternary section, interprets their depositional environments, presents a model for coastal depositional sequence development in a passive margin setting and uses this understanding to develop the stratigraphy and Quaternary evolutionary history of the region. Data were obtained from numerous drill cores and outcrops. Chronology was based on age estimates acquired using optically stimulated luminescence, amino acid racemization, Uranium series and radiocarbon dating techniques. Geomorphic patterns were identified and interpreted using light detection and ranging imagery. Since lithofacies occurrence, distribution and stratigraphic patterns are different on interfluves than in palaeo‐valleys, this study focused on interfluves to obtain a record of highstand sea‐level cycles with minimal alteration by fluvial processes during subsequent lowstands. Nine primary lithofacies and four diagenetic facies were identified in outcrops and cores. The uppermost depositional sequence on interfluves exhibits an upward succession from shelly marine lithofacies to tidal estuarine lithofacies and is bounded below by a marine ravinement surface and above by the modern land surface. Older depositional sequences in the subsurface are typically bounded above and below by marine ravinement surfaces. Portions of seven depositional sequences were recognized and interpreted to represent deposition from late middle Pleistocene to present. Erosional processes associated with each successive depositional sequence removed portions of older depositional sequences. The stratigraphic record of the most recent sea‐level highstands (Marine Isotope Stage 5a and Marine Isotope Stage 3) is best preserved. Glacio‐isostatic adjustment has influenced depositional patterns so that deposits associated with late Quaternary sea‐level highstands (Marine Isotope Stages 5c, 5a and 3), which did not reach as high as present sea‐level according to equatorial eustatic records, are uplifted and emergent within the study area.

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Glacioisostatic influences on Virginia's late Pleistocene coastal plain deposits

Cited by 17 publications

References 57 publications

Pleistocene relative sea levels in the Chesapeake Bay region and their implications for the next century

Pleistocene relative sea levels in the Chesapeake Bay region and their implications for the next century

Synthesis on Quaternary aeolian research in the unglaciated eastern United States

Quaternary coastal lithofacies, sequence development and stratigraphy in a passive margin setting, North Carolina and Virginia, USA

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