Seismic evidence of current-controlled sedimentation in the Belgica mound province, upper Porcupine slope, southwest of Ireland

Rooij, David Van; Mol, Ben De; Huvenne, Veerle A.I.; Ivanov, M.K.; Henriet, J.-P.

doi:10.1016/s0025-3227(02)00681-3

Cited by 132 publications

(178 citation statements)

References 27 publications

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“…As suggested by Van Rooij et al (2003), this current is probably focused along the blind channel in the southern part of the area, creating deep scouring there, and allowing hemipelagic sedimentation in the adjacent areas. Further to the north, where the channel becomes shallower, the current might spread over a wider area.…”

Section: Different Environmentsmentioning

confidence: 92%

“…500 to 1000 m, where the mounds occur, the general succession in cores consists of an upper layer of Holocene, foraminiferal sands, representative of the interglacial sedimentary environment, overlying several metres of silty clays or marls with dropstones, deposited during the last glacial event (Swennen et al 1998;Foubert 2002). On the eastern flank of the Porcupine Seabight, in the Belgica Mound area, Van Rooij et al (2003) found seismic evidence for the existence of two types of sediment drift. An elongated and a confined drift of presumably Quaternary age occur in the sedimentary sequences within which also the mounds are embedded.…”

Section: Setting Geologymentioning

confidence: 99%

“…This is illustrated by seismic profiles , by the smooth backscatter pattern on the sidescan sonar images and by the facies mapping: the moats contain the same type of bioturbated fine sediment as encountered elsewhere in the sedimentary areas of these two mound provinces. It appears that since the initiation of the mounds, probably in (Late) Pliocene times Van Rooij et al 2003), the northern Porcupine Seabight gradually became quieter, and that, in general, the amount of current influence during the development of the mounds decreased.…”

Section: Different Environmentsmentioning

confidence: 99%

“…Between the mounds, the slope is cut by several small, downslope directed channels or gullies. Van Rooij et al (2003) attributed the large channel to the action of a northward-directed bottom current, and interpreted the smaller gullies as minor turbiditic channels. The Belgica Mounds on their turn are often arranged 'en echelon', generally in north-south trending ridges, more or less parallel to the depth contours (especially to the south of the province).…”

Section: Tobi Sidescan Sonar Datamentioning

confidence: 99%

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The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

Huvenne¹,

Beyer

Haas

et al. 2005

Cold-Water Corals and Ecosystems

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Abstract. Carbonate mounds, identified as deep-water coral banks, have been reported recently from three provinces in the Porcupine Seabight, SW of Ireland. As yet, the mechanisms behind their formation and development are only partly understood. This contribution discusses their seabed appearance and present-day sedimentary environment, based on a large-scale TOB I sidescan sonar mapping carried out in 2002, and on detailed ROV video records from specific sites within the three mound provinces, collected in 2001. The study of the presentday characteristics and variability of these mounds can help to understand their development history in the past.The imagery clearly shows that the sedimentary environment in the Magellan and Hovland Mound provinces in the northern Porcupine Seabight is much quieter than in the current-swept Belgica Mound province on the eastern flank of the basin. In the latter area, for example, gravel lags and coarse sediments are found, together with patches of sorted sands, striations, barchan dunes and sediment waves. The difference in environment results in different mound appearances. The richest coral communities with the most abundant live coral occurrences are found in the Belgica province, while for example on the Magellan Mounds only a few live coral colonies are left. The present-day situation of the coral banks in the Porcupine Seabight thus illustrates the influence of the interplay between current and sediment dynamics on coral growth and mound development.

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Section: Different Environmentsmentioning

confidence: 92%

Section: Setting Geologymentioning

confidence: 99%

Section: Different Environmentsmentioning

confidence: 99%

Section: Tobi Sidescan Sonar Datamentioning

confidence: 99%

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The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

Huvenne¹,

Beyer

Haas

et al. 2005

Cold-Water Corals and Ecosystems

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“…These surrounding platforms consist of Precambrian and Palaeozoic metamorphic rocks, whereas the basin itself is the result of a failed rift event in the proto-North Atlantic. The basin contains up to 10 km of sediments that were deposited mainly during the Mesozoic and Cenozoic post-rift period, and thin northwards and towards the flanks of the basin (Van Rooij et al 2003). The basin developed in parallel during two major rifting periods, in the Permo-Triassic and the Middle to Late Jurassic.…”

Section: Study Areamentioning

confidence: 99%

Amplitude versus offset analyses of the deep sedimentary structures at the northern flank of the Porcupine Basin, SW of Ireland

Schmitz

Jokat

2006

Int J Earth Sci (Geol Rundsch)

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This paper represents an attempt of analysing the amplitude versus offset (AVO) behaviour and specific seismic attributes of sedimentary structures from the Porcupine Basin, SW of Ireland. During the last decade, a huge number of carbonate mounds were investigated in this region in water depths of 600-1,000 m, but the genesis and growth of these mounds are still not clearly identified. The aim of this paper is to give a better understanding of the connection between fluid migration pathways in the deeper underground and surface expressions of their fluid expulsions like gas chimneys and pockmarks through which the mounds may generate themselves. The data used in this study to determine boundary conditions for the physical properties of the underlaying strata were gathered from the northern flank of the Porcupine Basin, where a huge amount of fluid and/or gas chimneys covers the seabed. Marine seismic reflection data contain information about the elastic properties of the underlying earth, mainly based on the observed variations in the seismic reflection amplitude at different shot-receiver offsets. To extract elastic parameters from the data, inversion techniques were used, which presume that input amplitudes are proportional to reflection coefficients for plane wave reflection. To calibrate the AVO analyses with the existing stratigraphy in the working area we have used the well logs from several bore holes in the region. The results of this study show clearly that the investigated and identified pockmarks on the seafloor are the surface expression of hydrocarbon seepage in the deeper sedimentary underground.

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Phosphorites, Co‐rich Mn nodules, and Fe‐Mn crusts from Galicia Bank, NE Atlantic: Reflections of Cenozoic tectonics and paleoceanography

González

Somoza

Hein

et al. 2016

Geochem Geophys Geosyst

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A wide variety of marine mineral deposits were recovered from 750 to 1400 m water depths on Galicia Bank, Iberian margin. Mineral deposits include: (1) carbonate fluorapatite phosphorite slabs and nodules that replaced limestone and preserved original protolith fabric. (2) Ferromanganese vernadite crusts with high Mn and Fe (Mn/Fe = 1) contents, and thick stratabound layers consisting mainly of Mn (up to 27% MnO) and Fe (15% Fe2O3), which impregnated and replaced the phosphorite. (3) Co‐rich Mn nodules are composed of romanechite and todorokite laminae. Mn‐rich layers (up to 58% MnO) contain up to 1.8% Co. (4) Goethite nodules with Fe up to 67% Fe2O3 have low Mn and trace metals. We interpret this mineralization paragenesis to be related to major changes in oceanographic and tectonic regimes. Three phosphatization generations formed hardgrounds dated by 87Sr/86Sr isotopes as late Oligocene, early Miocene, and latest early Miocene. During the latest early Miocene, the hardground was fractured and breached due to regional intraplate tectonism, which was coeval with a widespread regional erosional unconformity. The stratabound layers and Co‐rich manganese nodules were derived from low‐temperature geothermally driven hydrothermal fluids, with fluid conduits along reactivated faults. During middle and late Miocene, the introduction of vigorous deep water flow from the Arctic generated growth of hydrogenetic ferromanganese crusts. Finally, growth of diagenetic Fe‐rich nodules (late Pliocene) was promoted by the introduction of hypersaline Mediterranean Outflow Water into the Atlantic Ocean.

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Seismic evidence of current-controlled sedimentation in the Belgica mound province, upper Porcupine slope, southwest of Ireland

Cited by 132 publications

References 27 publications

The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

Amplitude versus offset analyses of the deep sedimentary structures at the northern flank of the Porcupine Basin, SW of Ireland

Phosphorites, Co‐rich Mn nodules, and Fe‐Mn crusts from Galicia Bank, NE Atlantic: Reflections of Cenozoic tectonics and paleoceanography

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