Crustal structure and tectonostratigraphy of rifted-passive margins with applications for hydrocarbon exploration

Mann, Paul

doi:10.1016/b978-0-323-91918-0.00018-9

Cited by 2 publications

(5 citation statements)

References 134 publications

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“…Only one refraction station is present within the central Bahamas and indicates a depth to the top basement of 11 km that is related to a rift with Mesozoic salt diapirs known in the Exuma Sound area (Spector et al., 2016) (Figure 4a). We infer that salt deposits beneath the Exuma Sound are the southernmost occurrence of a discontinuous salt belt associated with rifts along the east coast of the USA (Mann, 2022).…”

Section: Tectonic Setting Of the Bcp And The Great Arc Of The Caribbeanmentioning

confidence: 98%

“…In this study, we use the earliest Jurassic (200 Ma) reconstruction of Müller et al (2019) to propose that the Bahamas hotspot was located near the tip of the present-day Florida Peninsula and formed the center of a large, radial dike swarm (Figure 2). The orientation of Triassic-Jurassic mafic dikes of the reconstructed, pre-rift continental blocks of North America, South America, and Africa are radial about this Bahamas hotspot (Marzoli et al, 2018), and have been inferred to be the center of its plume head (Mann, 2022) (Figures 2b-2e).…”

Section: Challenges For Understanding the Crustal Structure Of The Cu...mentioning

confidence: 99%

“…Basile et al (2020) dated volcanic rocks in the uppermost SDRs of the Demerara Plateau as Middle Jurassic (173.4 Ma), with the thick, underlying SDR sequence remaining undated. This regional pattern of Late Triassic to Early Jurassic magmatic activity collectively forms the CAMP along the three arms of the Proto-Central Atlantic Ocean, Proto-Bahamas and Gulf of Mexico (GOM), and the Proto-Equatorial Atlantic Ocean at the Triassic-Jurassic boundary (200)(201)(202) (Marzoli et al, 2018;Mann, 2022). The volcanic rocks underlying the BCP may have formed either as a northwestern branch of CAMP (Erlich & Pindell, 2020;Pindell et al, 2021) or were related to a more localized hotspot that included the conjugate Demerara and Guinea volcanic plateaus (Figure 2b).…”

Section: Tectonicmentioning

confidence: 99%

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Crustal Structure, Deformational History, and Tectonic Origin of the Bahamas Carbonate Platform

Shipper,

Mann

2024

Geochem Geophys Geosyst

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The 2–10‐km‐thick, mainly carbonate cap of the 14,000 km2 Bahamas carbonate platform (BCP) has impeded imaging of its underlying crustal structure. The deeper structure of the BCP records both its Mesozoic rift and hotspot history and its later deformation related to its Paleogene collision with the Great Arc of the Caribbean (GAC). We use regional gravity data to model the crustal structure, type, and deformational processes of the BCP by: (a) integrating publicly available seismic data; (b) inverting the Moho along 2D regional gravity transects across the collisional zone; (c) modeling flexural uplift of a forebulge that reflects the attempted subduction of the BCP beneath the GAC; and (d) using downhole temperatures and radiogenic heat production in 1D basin models to differentiate crustal types related to the Mesozoic rift history. We interpret three crustal domains underlying the BCP: (a) 27–12‐km‐thick, rifted, and thinned continental crust of the northern Bahamas between the Blake Plateau and Exuma Sound; (b) 24–12‐km‐thick, volcanically‐thickened oceanic crust related to the Triassic‐Jurassic Bahamas hotspot in the central Bahamas southeast of Long Island; and (c) 20–12‐km‐thick, thickened oceanic crust north of Hispaniola. We propose that these crustal types reflect northwest‐southeastward, Triassic‐Jurassic rifting of the Bahamas region during the breakup of Pangea and accompanying magmatic activity related to the Triassic‐Jurassic Bahamas hotspot and early oceanic spreading. Growth of the BCP during the Cretaceous in this area was followed by Late Cretaceous‐Paleogene subduction‐related flexure and terminal Paleogene collision between the GAC and the BCP.

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Section: Tectonic Setting Of the Bcp And The Great Arc Of The Caribbeanmentioning

confidence: 98%

Section: Challenges For Understanding the Crustal Structure Of The Cu...mentioning

confidence: 99%

Section: Tectonicmentioning

confidence: 99%

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Crustal Structure, Deformational History, and Tectonic Origin of the Bahamas Carbonate Platform

Shipper,

Mann

2024

Geochem Geophys Geosyst

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“…The rifted-passive margins of the South Atlantic contain examples of both magma-rich and magma-poor rifted-passive margins (Mann, 2022). Magma-rich examples can be found 1,800 km to the south of the Camamu-Almada basin in the Pelotas and 200 km to the north of the margin within the Sergipe-Alagoas basin (Caixeta et al, 2014;Gordon & Mohriak, 2015;Mohriak et al, 2000).…”

Section: Previous Interpretations Problems and Unresolved Questionsmentioning

confidence: 99%

“…Magma‐rich examples can be found 1,800 km to the south of the Camamu‐Almada basin in the Pelotas and 200 km to the north of the margin within the Sergipe‐Alagoas basin (Caixeta et al., 2014; Gordon & Mohriak, 2015; Mohriak et al., 2000). These magma‐rich, rifted‐passive margins are characterized by <10 to more than 15 km‐thick magmatic SDRs that overlie large intrusives into thinned continental or thickened oceanic crust (McDermott et al., 2018; Reuber & Mann, 2019; Mann, 2022).…”

Section: Introductionmentioning

confidence: 99%

Crustal Structure of the Camamu‐Almada Margin Along the Northeastern Rift Segment of Brazil From an Integration of Deep‐Penetration Seismic Reflection Profiles, Refraction, and Gravity Modeling

Romito

Mann

2022

Tectonics

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The Camamu‐Almada segment of the northeastern Brazil rifted‐passive margin covers an area of 22,000 km2 and includes: (a) thin to ultra‐thin metamorphic continental crust; (b) a transitional zone of unknown composition; and (c) Albian and younger oceanic crust. We investigate the structural‐magmatic evolution of the region by interpreting 19,000 line km of two‐dimensional reflection seismic data, 105 offshore well logs, and 15 seismic refraction stations. Interpretation of these data suggests that the 100 km‐wide rifted zone is structurally complex and composed of at least three discrete crustal blocks: (a) 10–40 km‐wide and 4–6 km‐thick zones of hyperextended continental and possibly unroofed lower continental crust with an average density of 2.88 g/cc; (b) two 20 km‐wide sub‐circular zones of exhumed mantle with an average density of 3.1 g/cc; and (c) 40–60 km‐wide and 6–7 km‐thick proto‐oceanic crust that formed in situ. These blocks are similar in thickness and composition to rifted zones described by previous workers along its conjugate margin in Gabon, West Africa, and on the rifted‐passive margin of the western Mediterranean.

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Crustal structure and tectonostratigraphy of rifted-passive margins with applications for hydrocarbon exploration

Cited by 2 publications

References 134 publications

Crustal Structure, Deformational History, and Tectonic Origin of the Bahamas Carbonate Platform

Crustal Structure, Deformational History, and Tectonic Origin of the Bahamas Carbonate Platform

Crustal Structure of the Camamu‐Almada Margin Along the Northeastern Rift Segment of Brazil From an Integration of Deep‐Penetration Seismic Reflection Profiles, Refraction, and Gravity Modeling

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