The polygenetic Kahouanne Seamounts in the northern Lesser Antilles island arc: Evidence for large-scale volcanic island subsidence

Carey, Steven; Sparks, R. S. J.; Tucker, Maurice E.; Li, T.; Robinson, Laura F.; Watt, Sebastian; Gee, M.J.R.; Hastie, Alan R.; Barfod, Dan N.; Stinton, A.; Leng, Melanie J.; Raineault, N.; Ballard, Robert D.

doi:10.1016/j.margeo.2019.106046

Cited by 8 publications

(2 citation statements)

References 62 publications

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“…Some features of the NLAS support the importance of eustatism on carbonate sediment productivity and transfer: A) drowned reefs or platforms on the Anguilla Bank indicate past periods of exposure and/or drowning of the platform (Schlager, , 1998Leclerc et al, 2014;Leclerc and Feuillet, 2019;Carey et al, 2020), and B) unconformities between seismic units in the Anguilla Valley (Figures 10C,D) and the St-Barthélémy Valley (Figure 7B) highlight periods with variation in sediment transport.…”

Section: Glacio-eustatismmentioning

confidence: 83%

Coexistence of Adjacent Siliciclastic, Carbonate, and Mixed Sedimentary Systems: An Example From Seafloor Morphology in the Northern Lesser Antilles Forearc

et al. 2022

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Three main types of factors commonly control the nature of the clasts, the arrangement of the distinctive lithologies, and the general architecture of turbidite systems: sedimentation rate and carbonate production; climates and glacio-eustatism; and morphology and tectonics. The coexistence of adjacent systems of distinctive nature is, however, scarcely documented, and the relative influence of each factor needs better constrain. In the Northern Lesser Antilles Segment (NLAS), carbonate and siliciclastic sediment sources coexist within a 150 km lateral distance, with carbonate platforms lying onto a volcanic substratum, and by a succession of spurs and triangular valleys that are bounded by active normal faulting. To better understand the factors controlling sedimentary processes from the carbonate platform sources to the deep-sea sinks, we used backscatter, bathymetry, multichannel seismic, and sub-bottom profiles. Sedimentary systems are dominated by siliciclastic input (by retrogressive erosion of confined canyons affecting the volcanic slope), carbonate input (by carbonate sediment transported by oceanic- and wind-driven submarine currents beyond the leeward edges of carbonates platforms), or both. In the mixed systems, the retrogressive erosion of the canyon head determines the nature of the source (volcanic on the slope, carbonate when the canyons reach the shelf edge). Glacio-eustatism has a key role in carbonate availability on the platform, as attested by the presence of drowned platforms. The main contribution of this study is the identification of the major role that tectonic activity plays in the short-distance coexistence of the distinctive sedimentary systems since fault-bounded V-shaped valleys in map view offer alternating leeward and windward edges favoring carbonate or mixed systems. Additionally, the steep slope gradient induced by normal faults and regional subsidence seems to be the main factor controlling sediment dispersal. It causes multiple line sources and the dispersion of gravity-driven currents under the effect of hydraulic jumps, thus preventing the formation of a channelized system. Our study provides a modern analog of adjacent systems dominated by distinctive lithologies in a tectonically active area. The results appear particularly appropriate to decipher the nature of ancient source-to-sink systems dominated by complex tectonics, paleo-bathymetry, and sediment routings.

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Section: Glacio-eustatismmentioning

confidence: 83%

Coexistence of Adjacent Siliciclastic, Carbonate, and Mixed Sedimentary Systems: An Example From Seafloor Morphology in the Northern Lesser Antilles Forearc

et al. 2022

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“…However, it helped to retrieve meaningful ages from submarine rocks (Clague et al, 2006), although 40 Ar/ 39 Ar ages can be significantly biased by 39 Ar recoil during irradiation (Walker and McDougall, 1982). It was also successfully used for dating young MORB and Lesser Antilles seamounts with an uncertainty of about 10% (Duncan and Hogan, 1994;Guillou et al, 2017;Carey et al, 2020), and yielded high precision ages for old differentiated rocks (e.g., Li et al, 2015).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

K-Ar Geochronology and geochemistry of underwater lava samples from the Subsaintes cruise offshore Les Saintes (Guadeloupe): Insights for the Lesser Antilles arc magmatism

et al. 2022

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Early Miocene (Burdigalian) marine rocky shores in the French Jura Massif: a palaeoecological and palaeoenvironmental analysis

Martinell

Juilleret

Doménech

2020

Facies

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The polygenetic Kahouanne Seamounts in the northern Lesser Antilles island arc: Evidence for large-scale volcanic island subsidence

Cited by 8 publications

References 62 publications

Coexistence of Adjacent Siliciclastic, Carbonate, and Mixed Sedimentary Systems: An Example From Seafloor Morphology in the Northern Lesser Antilles Forearc

Coexistence of Adjacent Siliciclastic, Carbonate, and Mixed Sedimentary Systems: An Example From Seafloor Morphology in the Northern Lesser Antilles Forearc

K-Ar Geochronology and geochemistry of underwater lava samples from the Subsaintes cruise offshore Les Saintes (Guadeloupe): Insights for the Lesser Antilles arc magmatism

Early Miocene (Burdigalian) marine rocky shores in the French Jura Massif: a palaeoecological and palaeoenvironmental analysis

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