Seismic expression and stratigraphic preservation of a coastal plain fluvial channel belt and floodplain channels on the Gulf of Mexico inner continental shelf

Subsurface fluvial deposits in coastline‐proximal settings record the spatiotemporal evolution of the coastal landscape and may be viable repositories of sediment for future coastal restoration projects. However, quantitative linkages between the geomorphic form and stratigraphic expression of coastal plain fluvial elements remain lacking, complicating coastal stratigraphic interpretations and subsurface resource assessment. This study explores the expression and preservation of fluvial coastal plain geomorphic features through outcrop‐scale seismic stratigraphic analysis of ultra‐high‐resolution chirp acoustic reflection data from the north‐western Gulf of Mexico inner continental shelf, offshore the Brazos River, Texas, USA. The chirp data exhibit decimetre‐scale vertical resolution within the upper 35 m of the shelf, evincing the preservation of two distinct types of coexisting fluvial channel‐forms: Type 1, a 1 km wide and 9 m deep single‐storey channel belt filled with sand‐rich lateral accretion deposits and channel fills; and Type 2, numerous 10 to 800 m wide and 1 to 20 m deep incisional floodplain channels filled with extensive drapes of overbank‐derived sediments. The chirp data resolve fluvial geomorphic elements including lateral accretion surfaces, levées, floodplain deposits and abandoned channel fills. Rollover of lateral accretion surfaces, widespread draping of seismic reflectors within channel fills, and quantitative comparison between the interpreted stratigraphic forms and analogous features on the nearby Texas Coastal Plain suggest near‐complete stratigraphic preservation of the geomorphic form of both channel belt and floodplain channel elements. Rapid aggradation of the coastal plain by the Brazos River in this region during the Holocene transgression is hypothesized as a mechanism for the high degree of preservation achieved. This study proposes the first recognition criteria for the seismic stratigraphic expression of coastal floodplain channels and provides direct linkages between the geomorphic and stratigraphic expression of a coastal plain fluvial landscape, promoting improved coastal stratigraphic interpretations and assessment of subsurface lithofacies distributions.

[1]  P. Passalacqua,et al.  Tributary channel networks formed by depositional processes , 2022, Nature Geoscience.

[2]  M. Wallace,et al.  3D seismic geomorphology of Early Cenozoic incised channels, Gippsland Basin, SE Australia: evidence for submarine origin , 2022, Sedimentary Geology.

[3]  Stratigraphic Record , 2021, Encyclopedic Dictionary of Archaeology.

[4]  T. Goudge,et al.  The anatomy of exhumed river‐channel belts: Bedform to belt‐scale river kinematics of the Ruby Ranch Member, Cretaceous Cedar Mountain Formation, Utah, USA , 2020, Sedimentology.

[5]  Louis P. Howell,et al.  Controls on the deposition and preservation of architectural elements within a fluvial multi-storey sandbody , 2020 .

[6]  J. Goff,et al.  Recommended "Best Practices" for Chirp Acquisition and Processing , 2019 .

[7]  E. Hajek,et al.  Using bar preservation to constrain reworking in channel-dominated fluvial stratigraphy , 2019, Geology.

[8]  J. Czuba,et al.  Dynamics of Surface‐Water Connectivity in a Low‐Gradient Meandering River Floodplain , 2019, Water Resources Research.

[9]  J. Czuba,et al.  Channelization of meandering river floodplains by headcutting , 2018, Geology.

[10]  D. Hodgson,et al.  Controls on the depositional architecture of fluvial point‐bar elements in a coastal‐plain succession , 2018, Fluvial Meanders and Their Sedimentary Products in the Rock Record.

[11]  G. S. Sambrook Smith,et al.  Hydrodynamic controls on alluvial ridge construction and avulsion likelihood in meandering river floodplains , 2018, Geology.

[12]  C. Paola,et al.  Time Not Our Time: Physical Controls on the Preservation and Measurement of Geologic Time , 2018, Annual Review of Earth and Planetary Sciences.

[13]  P. Durkin,et al.  Evolution of fluvial meander-belt deposits and implications for the completeness of the stratigraphic record , 2017 .

[14]  K. Straub,et al.  Autogenic Sedimentation in Clastic Stratigraphy , 2017 .

[15]  John A. Goff,et al.  Seismic morphology and infilling structure of the buried channel system beneath the inner shelf off western Long Island, New York: Accessing clues to palaeo-estuarine and coastal processes , 2017 .

[16]  D. Edmonds,et al.  Controls on the occurrence and prevalence of floodplain channels in meandering rivers , 2017 .

[17]  John B. Anderson,et al.  Recycling sediments between source and sink during a eustatic cycle: Systems of late Quaternary northwestern Gulf of Mexico Basin , 2016 .

[18]  T. Dellapenna,et al.  The evolution of a subaqueous delta in the Anthropocene: A stratigraphic investigation of the Brazos River delta, TX USA , 2015 .

[19]  C. Jackson,et al.  Nature, origin and evolution of a Late Pleistocene incised valley‐fill, Sunda Shelf, Southeast Asia , 2015 .

[20]  J. Goff,et al.  The impact of Hurricane Sandy on the shoreface and inner shelf of Fire Island, New York: Large bedform migration but limited erosion , 2015 .

[21]  M. Ghinassi,et al.  Planform architecture, stratigraphic signature and morphodynamics of an exhumed Jurassic meander plain (Scalby Formation, Yorkshire, UK) , 2014 .

[22]  John B. Anderson,et al.  Variable response of coastal environments of the northwestern Gulf of Mexico to sea-level rise and climate change: Implications for future change , 2014 .

[23]  D. FitzGerald,et al.  Coastal response to late-stage transgression and sea-level highstand , 2014 .

[24]  P. Ashworth,et al.  The negative relief of large river floodplains , 2014 .

[25]  S. Gagliano,et al.  Prehistoric Site Discovery on the Outer Continental Shelf, Gulf of Mexico, United States of America , 2014 .

[26]  Paul D. Bates,et al.  Floodplain channel morphology and networks of the middle Amazon River , 2012 .

[27]  M. Kleinhans,et al.  Sedimentary architecture of abandoned channel fills , 2012 .

[28]  P. Heller,et al.  Flow-Depth Scaling in Alluvial Architecture and Nonmarine Sequence Stratigraphy: Example from the Castlegate Sandstone, Central Utah, U.S.A. , 2012 .

[29]  H. Posamentier,et al.  Seismic geomorphology and high-resolution seismic stratigraphy of inner-shelf fluvial, estuarine, deltaic, and marine sequences, Gulf of Thailand , 2011 .

[30]  I. Fuller,et al.  Late Quaternary geomorphology of the Manawatu coastal plain, North Island, New Zealand , 2010 .

[31]  Brian J. Willis,et al.  Three-Dimensional Connectivity of Point-Bar Deposits , 2010 .

[32]  J. Bridge,et al.  A Revised Alluvial Stratigraphy Model , 2009 .

[33]  A. Amorosi,et al.  Late Quaternary palaeoenvironmental evolution of the Adriatic coastal plain and the onset of Po River Delta , 2008 .

[34]  C. Paola,et al.  Valleys That Never Were: Time Surfaces Versus Stratigraphic Surfaces—Reply , 2008 .

[35]  John B. Anderson,et al.  The influence of valley aggradation and listric normal faulting on styles of river avulsion: A case study of the Brazos River, Texas, USA , 2008 .

[36]  Z. Sylvester,et al.  Migration–aggradation history and 3-D seismic geomorphology of submarine channels in the Pleistocene Benin-major Canyon, western Niger Delta slope , 2007 .

[37]  J. Goff,et al.  Seismic Facies of Incised-Valley Fills, New Jersey Continental Shelf: Implications for Erosion and Preservation Processes Acting During Latest Pleistocene–Holocene Transgression , 2006 .

[38]  D. A. Sylvia,et al.  Morphology and stratigraphy of the late Quaternary lower Brazos valley: Implications for paleo-climate, discharge and sediment delivery , 2006 .

[39]  M. Blum,et al.  Signatures of climate vs. sea-level change within incised valley-fill successions: Quaternary examples from the Texas GULF Coast , 2006 .

[40]  M. Gibling.  Width and Thickness of Fluvial Channel Bodies and Valley Fills in the Geological Record: A Literature Compilation and Classification , 2006 .

[41]  John B. Anderson,et al.  Overfilled Versus Underfilled Incised Valleys: Examples From the Quaternary Gulf of Mexico , 2006 .

[42]  J. Goff,et al.  Seismic geomorphology of buried channel systems on the New Jersey outer shelf: assessing past environmental conditions , 2005 .

[43]  John B. Anderson,et al.  Late quaternary stratigraphic evolution of the northern gulf of Mexico Margin , 2004 .

[44]  John B. Anderson,et al.  The Late Quaternary Brazos and Colorado Deltas, Offshore Texas, U.S.A.—Their Evolution and the Factors that Controlled Their Deposition , 2004 .

[45]  Antonio Cattaneo,et al.  Transgressive deposits: a review of their variability , 2003 .

[46]  J. Bridge.  Rivers and Floodplains: Forms, Processes, and Sedimentary Record , 2003 .

[47]  John B. Anderson,et al.  Variations in shoreface progradation and ravinement along the Texas coast, Gulf of Mexico , 2001 .

[48]  J. T. Abbott.  Houston Area Geoarcheology: A Framework for Archeological Investigation, Interpretation, and Cultural Resource Management in the Houston Highway District , 2001 .

[49]  C. Paola,et al.  Interpreting avulsion process from ancient alluvial sequences: Guadalope-Matarranya system (northern Spain) and Wasatch Formation (western Colorado) , 2000 .

[50]  T. Törnqvist,et al.  Fluvial responses to climate and sea‐level change: a review and look forward , 2000 .

[51]  K. Abdulah.  The evolution of the Brazos and Colorado fluvial/deltaic systems during the Late Quarternary: An integrated study, offshore Texas , 1995 .

[52]  John B. Anderson,et al.  Sea-Level Controls on the Facies Architecture of the Trinity/Sabine Incised-Valley System, Texas Continental Shelf , 1994 .

[53]  J. Syvitski,et al.  Geomorphic/Tectonic Control of Sediment Discharge to the Ocean: The Importance of Small Mountainous Rivers , 1992, The Journal of Geology.

[54]  H. L. Berryhill.  Late Quaternary Facies and Structure, Northern Gulf of Mexico: Interpretations from Seismic Data , 1987 .

[55]  W. A. Price,et al.  Late Quaternary Sea-Level Fluctuations and Sedimentary Phases of the Texas Coastal Plain and Shelf , 1987 .

[56]  N. Shackleton.  Oxygen isotopes, ice volume and sea level , 1987 .

[57]  S. Penland,et al.  Late Quaternary Sea-Level Fluctuations and Depositional Sequences, Southwest Louisiana Continental Shelf , 1987 .

[58]  J. Demarest,et al.  Stratigraphic Record of Quaternary Sea Levels: Implications for More Ancient Strata , 1987 .

[59]  D. Swift,et al.  Transgressive stratigraphy at sequence - bounding unconformities: some principles derived from Holoc , 1987 .

[60]  N. Shackleton,et al.  Oxygen isotopes and sea level , 1986, Nature.

[61]  John C. Lorenz,et al.  Determination of Widths of Meander-Belt Sandstone Reservoirs from Vertical Downhole Data, Mesaverde Group, Piceance Creek Basin, Colorado , 1985 .

[62]  Daniel F. Belknap,et al.  Influence of antecedent geology on stratigraphic preservation potential and evolution of Delaware , 1985 .

[63]  J. D. Hays,et al.  The orbital theory of Pleistocene climate : Support from a revised chronology of the marine δ^ O record. , 1984 .

[64]  D. Belknap,et al.  Preservation potential of transgressive coastal lithosomes on the U.S. Atlantic shelf , 1981 .

[65]  W. E. Galloway,et al.  Depositional Architecture of Cenozoic Gulf Coastal Plain Fluvial Systems , 1981 .

[66]  J. B. Sangree,et al.  Interpretation of depositional facies from seismic data , 1979 .

[67]  M. Slater,et al.  Vertical and lateral building of river sandstone bodies, Ebro Basin, Spain , 1979, Journal of the Geological Society.

[68]  C. Payton,et al.  Seismic stratigraphy and global changes of sea level; Part 6, Stratigraphic interpretation of seismic reflection patterns in depositional sequences , 1977 .

[69]  C. Dill,et al.  Holocene Sedimentary Environment of the Atlantic Inner Shelf off Delaware , 1974 .

[70]  Jean Lajoie,et al.  Sand and Sandstone , 1974 .

[71]  R. J. Leblanc,et al.  Recent sediments of southeast Texas-a field guide to the Brazos alluvial and deltaic plains and the Galveston barrier island complex. , 1970 .

[72]  D. Swift.  Coastal Erosion and Transgressive Stratigraphy , 1968, The Journal of Geology.

[73]  H. A. Bernard,et al.  Recent Meander Belt Deposits of the Brazos River: An Alluvial Sand"Model: ABSTRACT" , 1963 .