Geological and Geophysical Constraints Guide New Tectonic Reconstruction of the Gulf of Mexico

Filina, Irina; Beutel, E. K.

doi:10.1002/essoar.10511463.1

Cited by 4 publications

(22 citation statements)

References 26 publications

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“…Between oceanic crust and continental crust is a domain characterized by poor seismic imaging and lack of a Moho (Figure 4e). Consistent with other authors (e.g., Filina & Beutel, 2021;Filina & Hartford, 2021;Pindell et al, 2014), we interpret this terrain as either exhumed lower crust or mantle, either of which necessitates crustal-scale exhumation faulting (Figure 4e).…”

Section: Basement Observationssupporting

confidence: 91%

“…Furthermore, extension could be equivalent in all lithospheric layers, but be distributed over different widths, which would produce spatially variable subsidence trends (White & McKenzie, 1988). Filina and Beutel (2021) interpret significant differences in upper and lower crustal stretching in the GoM. The scale of anomalous Mesozoic subsidence found in this study is of the same magnitude as post‐rift DDT‐driven subsidence interpreted elsewhere (Morley & Westaway, 2006; Zhao et al., 2013).…”

Section: Discussionsupporting

confidence: 72%

“…Increasing observations of semi-transparent seismic facies and depositional structures, including clinoforms and growth strata, suggest that immediate pre-salt deposition (the UPM) was dominated by deepwater siliciclastic material in the basin center (Filina & Hartford, 2021;Izquierdo-Llavall et al, 2022;Williams-Rojas et al, 2012). Pre-salt sedimentary basins are also supported by magnetic and gravity observations (Filina & Beutel, 2021).…”

Section: Early Gom Evolutionmentioning

confidence: 61%

“…In the north, the UPM is broken by basin‐dipping normal faults that are absent in the south, indicating that at the time of salt deposition the basin was late‐syn‐rift in the north but late‐ or post‐rift in the south. This asymmetry in the sub‐salt GoM is also evident in the widths of oceanic crust and interpreted magmatic input (Filina & Beutel, 2021). We interpret that salt was deposited in a syn‐thinning or early syn‐exhumation basin (in terminology of Rowan (2014)), prior to oceanic crust emplacement.…”

Section: Discussionmentioning

confidence: 86%

“…Our interpretation is based on seismic interpretation presented in this contribution, and paleogeography research (Peel, 2023). We refer readers to the thorough review by Filina and Beutel (2021) for a detailed description of GoM tectonics. Prior to salt deposition the study area was a broad, deep, extensional basin.…”

Section: Early Gom Evolutionmentioning

confidence: 99%

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Structural Restorations of the Complete Conjugate US‐Mexico Eastern Gulf of Mexico Margin

Curry,

Hudec,

Peel

et al. 2024

Tectonics

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We present the first sequential structural restoration with flexural backstripping of the Gulf of Mexico US‐Mexico conjugate margin salt basin. We construct four large‐scale (100s of km) balanced, sequential structural restorations to investigate spatio‐temporal patterns of subsidence, geometry of the original salt basin, feedbacks between post‐salt structural and stratigraphic evolution, paleo‐bathymetry, and crustal configurations. The restorations are based on interpretations of 2D and 3D seismic data, and include sequential sedimentary decompaction, flexural isostatic backstripping, and thermal isostatic corrections. The spatially variable crustal thinning factor is directly measured from seismic data, and lithologic parameters are determined by well penetrations. We present a model for the original salt basin and discuss evidence for and implications of a deep water salt basin setting for the GoM. Our analysis suggests a salt basin that contained ∼1–2 km thick salt in a basin 175–390 km across with ∼1 km of bathymetry after salt deposition. The base of salt is mostly smooth with <1 km of local relief in the form of normal faults that disrupt a pre‐salt sedimentary section. We find that supra‐salt extension and shortening are not balanced, with measurable extension exceeding shortening by 18–30 km on each cross‐section. Our subsidence analysis reveals anomalous subsidence totaling 1–2 km during Late Jurassic and Early Cretaceous times that may reflect dynamic topography or depth‐dependent thinning. We offer an interpretation of crustal breakup invoking pre‐salt clastic sedimentation, salt deposition in a deep water syn‐thinning basin, and post‐salt lower‐crustal exhumation.

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Section: Basement Observationssupporting

confidence: 91%

Section: Discussionsupporting

confidence: 72%

Section: Early Gom Evolutionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 86%

Section: Early Gom Evolutionmentioning

confidence: 99%

See 3 more Smart Citations

Structural Restorations of the Complete Conjugate US‐Mexico Eastern Gulf of Mexico Margin

Curry,

Hudec,

Peel

et al. 2024

Tectonics

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New insights into the crustal architecture and tectonic evolution of the Eastern Gulf of Mexico

et al. 2023

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The Gulf of Mexico is an intraplate oceanic basin where rifting commenced in the Late Triassic, leading to drifting and ensuing oceanic accretion by Middle‐Late Jurassic, which ceased by the Early Cretaceous. Its tectonic evolution encompasses multiple rifting phases dominated by orthogonal extension, variable magmatism and salt deposition. This complex tectonic history is recorded within the rifted margins of the Gulf of Mexico, including along the eastern part of the basin, where considerable uncertainty remains regarding the tectonic evolution and resulting crustal configuration. This study presents new insights into the crustal types and an updated tectonic framework for the Florida margin. An integrated analysis of seismic and potential field data allows us to characterize the nature of the crust, which shows wide zones of hyperextended continental crust, seaward dipping reflection (SDR) packages, exhumed mantle and magmatic crust. Our results propose elements that could improve the plate model of the Gulf of Mexico, by accounting for the polyphase nature of rifting, the counter‐clockwise rotation of the Yucatan block and the observed increase in magmatic supply.

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Nuevas observaciones en la corteza continental transicional del sur del Golfo de México y sus implicaciones en los modelos de margen continental

Rosales Rodríguez

2024

Geofis Int

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La interpretación de las propiedades físicas de la corteza y manto comúnmente se hace a partir de la asociación de velocidades sísmicas con la mineralogía de las rocas ígneas que las constituyen, dado que los afloramientos de corteza o manto exhumados o pozos que cortan las rocas de basamento continental u oceánico son escasos. La corteza oceánica del Golfo de México se caracteriza por velocidades sísmicas de 6.1-6.9 km/s, asociadas a gabros. Se observan diferencias en el rango de velocidades sísmicas entre la porción oriental y occidental de la corteza oceánica, tanto a nivel de corteza como en el manto. Se identifican anomalías de velocidades sísmicas entre la corteza y el manto, principalmente en áreas cercanas al límite corteza oceánica-continental. Estas anomalías de velocidades sísmicas se asocian a intrusiones máficas ocurridas durante la apertura del Golfo de México. Estas intrusiones también se interpretan en la base de la corteza a partir del modelado magnético de un perfil en el sur del Golfo de México. Con el modelado magnético se interpreta manto serpentinizado en el área de la Anomalía Magnética de Campeche. Con ambas interpretaciones se sugieren dos periodos de evolución tectónica del Golfo de México; el primer periodo es asociado a un margen continental no volcánico, en el cual ocurre la exhumación y la serpentinización del manto, el segundo periodo asociado a un margen volcánico en el cual ocurre la intrusión de rocas máficas cercanas al límite corteza oceánica-continental y la rotación de Yucatán.

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Geological and Geophysical Constraints Guide New Tectonic Reconstruction of the Gulf of Mexico

Cited by 4 publications

References 26 publications

Structural Restorations of the Complete Conjugate US‐Mexico Eastern Gulf of Mexico Margin

Structural Restorations of the Complete Conjugate US‐Mexico Eastern Gulf of Mexico Margin

New insights into the crustal architecture and tectonic evolution of the Eastern Gulf of Mexico

Nuevas observaciones en la corteza continental transicional del sur del Golfo de México y sus implicaciones en los modelos de margen continental

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