Archive of sediment data from vibracores collected in 2010 offshore of the Mississippi barrier islands

Kelso, Kyle W.; Flocks, James G.

doi:10.3133/ds903

Cited by 3 publications

(6 citation statements)

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“…Cores consist of interbedded grayish brown, medium to fine sands and olive-gray muds to tan well sorted, medium to fine sands ( Figure 6, 8). Where described, shell content was minimal throughout the deposit (Kelso and Flocks 2015). Sand and mud filled burrows, as well as wood fragments are common.…”

Section: Unit 3: Fluvial Lateral Accretion Depositsmentioning

confidence: 95%

“…Onlapping marine muds at a depth of 7m mark the toe of the shoreface at the western end of the MSAL barrier chain at Ship Island (Twichell et al 2013). Shallow cores (Kelso and Flocks 2015) and geophysical data (Forde et al 2011a(Forde et al , 2011b(Forde et al , 2013 offshore Petit Bois show the toe of the shoreface at 8-10m. Dauphin Island's shoreface toe is marked by exposed Pleistocene deposits at 7m.…”

Section: Coastal and Physical Settingmentioning

confidence: 99%

“…New macrofossil samples were collected from archived cores at the USGS Center for Marine and Coastal Science (Kelso and Flocks 2015), Geological Survey of Alabama (Hummel and Parker 1995) and cores collected in this study for radiocarbon dating (Table 1). Twenty-four new radiocarbon dates were obtained using the continuous flow gas bench accelerator mass spectrometer method developed at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) of the Woods Hole Oceanographic Institution.…”

Section: Radiocarbon Dating Estimatesmentioning

confidence: 99%

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Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico, USA

Hollis

Wallace

Miner

et al. 2019

Quaternary Science Reviews

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Coastal systems in the Gulf of Mexico are threatened to reduced sediment supply, storm impacts and relative sea level rise (RSLR). The geologic record can provide insights of geomorphic threshold crossings (formation, progradation, transgression, destruction) to these forcing mechanisms to predict future barrier evolution to climate change. The stratigraphic framework and antecedent topography directly influence coastal evolution over geologic timescales. This study synthesizes ~2100km of geophysical data, 700+ sediment cores, and 63 radiocarbon dates to regionally map two sequence boundaries, multiple ravinement surfaces and fourteen depositional facies. One marine isotope stage (MIS) 6 valley's fill provided up to 300 x10 6 m 3 of sand to modern systems through transgressive ravinement during the Holocene. Repeated storm breaches or tidal inlets correspond to paleotopographic low's in the MIS 2 surface. A Holocene geomorphic evolutionary model was created for Petit Bois and Dauphin Island from available data, highlighting RSLR rates and sediment supply. As the MIS 2 surface was flooded, tidal/wave scour supplied sand to migrating marine shoals. These rapidly transgressing shoals converted drowned paleovalleys to estuaries starting about 9ka. Islands formed in their modern positions about 6ka, when sediment supply was high and RSLR rates were 2mm/yr. Between 4ka-1750 CE. Islands prograded due to RSLR rates of 1-0.4mm/yr and sufficient sand supply from alongshore and inner shelf sources. Currently, the islands experience RSLR rates of 3.61 mm/yr and reduced sediment supply resulting in barrier degradation. This study provides geologic evidence of coastal geomorphic thresholds related to RSLR, sediment supply and antecedent topography. iii ACKNOWLEDGMENTS I would like to thank my advisor, Dr. Davin Wallace for his guidance and great support through this project. I would also like to thank my committee members Dr. Michael Miner and Dr. Jessica Pilarczyk, and lab mates, Clayton Dike, Nina Gal, and Shara Gremillion for their helpful and insightful feedback and guidance. This project was funded by the Bureau of Ocean and Energy Management, as part of a Gulf of Mexico sand resource mapping effort. Thank you to colleagues at the University of Alabama, the Geological Survey of Alabama and USGS for allowing core sampling. The USGS and UTIG shared archive geophysical data. Mollusk bivalve identification was greatly aided by Dr. Jennifer Walker. Dr. John Anderson (Rice) and Dr. Ervin Otvos (USM) also provided valuable insight. iv DEDICATION This thesis is dedicated to friends, family and loved ones especially Bob, Ellen, Joey and Alli. Their love, appreciation and support allowed me to pursue my scientific passion. v

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Section: Unit 3: Fluvial Lateral Accretion Depositsmentioning

confidence: 95%

Section: Coastal and Physical Settingmentioning

confidence: 99%

Section: Radiocarbon Dating Estimatesmentioning

confidence: 99%

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Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico, USA

Hollis

Wallace

Miner

et al. 2019

Quaternary Science Reviews

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show abstract

“…8). A core collected from the deposit describes the unit as poorly-sorted fine to medium-size light gray sand interbedded with olive gray clay (Kelso and Flocks, 2015). Oyster shells are present at the top of the unit, but are minimal within the deposit.…”

Section: Subbottom Acoustic and Sedimentologic Interpretationmentioning

confidence: 99%

Geologic control on the evolution of the inner shelf morphology offshore of the Mississippi barrier islands, northern Gulf of Mexico, USA

Flocks

Kindinger

Kelso

2015

Continental Shelf Research

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“…The eastern side of the deposit extends beyond the study area. A sediment core that penetrated this deposit found 91 percent moderately sorted fine to medium sands increasing downcore (Kelso and Flocks, 2015), interbedded with lenticular silts (table 1). The thickness of the feature and its position relative to the fluvial channel are shown in figure 10.…”

Section: Stratigraphymentioning

confidence: 99%

Near-surface stratigraphy and morphology, Mississippi Inner Shelf, northern Gulf of Mexico

Flocks¹,

Kindinger²,

Kelso³

et al. 2015

Open-File Report

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Archive of sediment data from vibracores collected in 2010 offshore of the Mississippi barrier islands

Cited by 3 publications

References 0 publications

Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico, USA

Late Quaternary evolution and stratigraphic framework influence on coastal systems along the north-central Gulf of Mexico, USA

Geologic control on the evolution of the inner shelf morphology offshore of the Mississippi barrier islands, northern Gulf of Mexico, USA

Near-surface stratigraphy and morphology, Mississippi Inner Shelf, northern Gulf of Mexico

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