Introduction and Explanatory Notes

Buffler, R.T; Schlager, W.; Pisciotto, K.A.

doi:10.2973/dsdp.proc.77.101.1984

Cited by 20 publications

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“…Standard density values were used for continental crust (2.75–2.9 g/cm 3 ), oceanic crust (2.9–3.0 g/cm 3 ), SDRs (2.65–2.75 g/cm 3 ), magmatic underplating (2.9–3.0 g/cm 3 ), serpentinized mantle (2.7–3.2 g/cm 3 ) and mantle (3.3 g/cm 3 ) (Bassetto et al, 2000; Holbrook et al, 1994; Mjelde et al, 2005). In the Eastern Gulf of Mexico, a gravity model was previously applied on the seismic line coincident with the GUMBO line 3 (Liu et al, 2019) using continental crust densities based on the DSDP well Site 537, located on a structural high close to Campeche Escarpment (Buffler, Schlager, Bowdler, et al, 1984; Buffler, Schlager, & Pisciotto, 1984). In this study, we used density values of 2.75 and 2.85 g/cm 3 for the attenuated and thicker continental crust respectively.…”

Section: Methodsmentioning

confidence: 99%

“…These seismic lines partially image the Moho discontinuity; while the basement, syn‐rift and post‐rift sequences are well imaged, where evaporites are not present. Our seismic data were complemented by integrating published seismic interpretations and well data (Buffler, Schlager, Bowdler, et al, 1984; Buffler, Schlager, & Pisciotto, 1984; Marton & Buffler, 1999, 2016) from DSDP leg 77 (site 353; Figure 1). These data are located to the southeast of our study area and were used to correlate the top syn‐rift sequence previously identified in DSDP leg 77, site 535 (Buffler, Schlager, Bowdler, et al, 1984; Buffler, Schlager, & Pisciotto, 1984; Marton & Buffler, 1999, 2016) into our seismic reflection lines and construct the structural framework at the south‐western part of the Florida margin.…”

Section: Data and Approachmentioning

confidence: 99%

“…Bathymetry map (Smith & Sandwell, 1997) in the Florida margin, Eastern Gulf of Mexico, which includes: the transparent orange and white zones that correspond to the geographic range of the inner limit of the oceanic crust (ILOC) and the extinct spreading ridges, respectively, previously interpreted in the EGOM (Bird et al, 2005; Christeson et al, 2014; Deighton et al, 2017; Filina et al, 2020; Filina & Beutel, 2022; Hudec, Norton, et al, 2013; Izquierdo‐Llavall et al, 2022; Kneller & Johnson, 2011; Lundin & Doré, 2017; Minguez et al, 2020; Nguyen & Mann, 2016; Pindell et al, 2016; Pindell & Kennan, 2009; Sandwell et al, 2014); black dotted/dashed line traces represent formerly proposed NW‐SE trending transfer fault (FTZ: Florida Transfer Zone; Pindell, 1985); yellow dashed line traces are the GUMBO refraction lines 3 and 4; seismic lines used in this study are shown in white, with portion of interest displayed in Figures 4–7 highlighted in orange, and black dashed traces indicating the 2‐D gravity models presented in Figure 9. The location of the well 224‐A #1‐C (Babcock, 1970) in the north, and the DSDP Leg 77, site 535 (Buffler, Schlager, Bowdler, et al, 1984; Buffler, Schlager, & Pisciotto, 1984; Schlager et al, 1984) in the south were used to further analyse the age and nature of volcanism, and the top of syn‐rift sequence. Seismic data courtesy of TGS.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Data and Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…3(a). assessed the stratigraphic structure of the seabed was from seismograms and core data [Buffler et al (1984); Worzel (1973); Shaub (1987); Brunson et al (1980)]. Fig.…”

Section: Modeling Of 3d Propagation Effects Observed In the Church Stmentioning

confidence: 99%

Acoustic Modeling Using a Three-Dimensional Coupled-Mode Model

Ballard¹

2013

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The overall goal of this research is the development of an accurate and reliable propagation model applicable to environments which exhibit strong range dependence in all three spatial dimensions. OBJECTIVES The objective of this work is to gain an understanding the physics of propagation in continental shelf areas, specifically horizontal refraction and mode coupling induced by three-dimensional (3D) inhomogeneities in the waveguide. A coupled-mode approach has been applied for this purpose. The coupled-mode approach is attractive for solving problems involving 3D propagation for several reasons. First, this technique provides intuitive results for understanding the features responsible for observed propagation effects in range-dependent environments. For example, upslope propagation is characterized by acoustic energy radiated into the bottom at discrete depths associated with mode cutoff. The modal decomposition of the acoustic field has also been used to describe horizontal refraction in a wedge-shaped ocean, for which the single-mode interference pattern associated with rays launched up and across the shelf has been well documented [Weinberg and Burridge (1974)]. Furthermore, coupled-mode solutions can be highly accurate and have been used for benchmarking solutions to range-dependent problems [Jensen and Ferla (1990)]. In order to appreciate the limitations of existing 3D models, it is necessary to have methods which can provide reference solutions for comparison. APPROACH A 3D acoustic propagation model based on the stepwise coupled-mode approach [Evans (1983)] implemented as a single-scatter solution has been developed. This technique is based on a hybrid modeling approach for which normal modes supply the vertical dependence and a parabolic equation (PE) solution provides the horizontal dependence. The inhomogeneous Helmholtz equation for pressure P(r, θ , z) at range r, azimuth θ , and depth z from a point continuous wave source of amplitude S(ω), 1 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

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The Gulf of Mexico Sedimentary Basin

Snedden¹,

Galloway²

2019

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Introduction and Explanatory Notes

Abstract: Sample requests should refer to a specific interval within a section of a core, rather than a total depth below sea level.

Cited by 20 publications

References 11 publications

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

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

Acoustic Modeling Using a Three-Dimensional Coupled-Mode Model

The Gulf of Mexico Sedimentary Basin

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