Cold-water coral mounds on the Pen Duick Escarpment, Gulf of Cadiz: The MiCROSYSTEMS project approach

Rooij, David Van; Blamart, Dominique; Mol, Lies De; Mienis, Furu; Pirlet, H.; Wehrmann, Laura Mariana; Barbieri, Roberto; Maignien, Loïs; Templer, Stefanie P; Haas, H. de; Hebbeln, Dierk; Frank, Norbert; Larmagnat, S; Stadnitskaia, Alina; Stivaletta, Nunzia; Weering, T. van; Zhang, Y.; Hamoumi, Naima; Cnudde, Veerle; Duyck, Philippe; Henriet, Jean‐Pierre

doi:10.1016/j.margeo.2010.08.012

Cited by 57 publications

(29 citation statements)

References 63 publications

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“…The upper part has a low-frequency strong-reflection top interface and evident diffraction; the inside has a weak and disordered reflection structure or does not have a reflection structure. These reflection facies are also similar to those of outcropping and buried coral reefs (Orme and Salama, 1988;Vora et al, 1996;Van Rooij et al, 2011). In the 250-ms strata beneath the seafloor of the study area, there are two main reflection interfaces (Rf2 and Rf1, respectively, from the top down; see Fig.…”

Section: Seismic Datasupporting

confidence: 61%

“…The seismic data reveal that there are two seismic reflection interfaces (Rf1 and Rf2) in the sedimentary strata with thickness of 200 m (V p E1,600 m/s) beneath the seafloor in the study area and that there are small mound reflection bodies along the above interfaces, whose reflection characteristics are comparable with the seismic reflection patterns of the coral reefs on other continental shelves and continental slopes (Huvenne et al, 2003;Van Rooij et al, 2011). The sub-bottom profile and bathymetric data indicate that coral reefs also exist in the shallow sedimentary strata near the seafloor throughout most of the study area.…”

Section: Development Stages and Distribution Of The Submerged Reefsmentioning

confidence: 71%

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The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea

Zhao

et al. 2015

Continental Shelf Research

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Section: Seismic Datasupporting

confidence: 61%

Section: Development Stages and Distribution Of The Submerged Reefsmentioning

confidence: 71%

The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea

Zhao

et al. 2015

Continental Shelf Research

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“…Alpha Mound is located on the SE edge of the PDE (Figure c). Its estimated width and height are 200 and 15 m, respectively, with an average footprint of 0.27 km 2 (Van Rooij et al, ).…”

Section: Study Sitementioning

confidence: 99%

“…The methane escaping from the sediments in the El Arraiche field has a mixed but dominantly deep, thermogenic origin (Hensen et al, ; Maignien et al, ; Stadnitskaia, Ivanov, Blinova, Kreulen, & van Weering, ). Today, methane gas has been measured in the pore waters of Alpha Mound, but no active bubbling of gas has been observed at its surface (Van Rooij et al, ; Wehrmann et al, ). Previous studies have used Alpha Mound as a model for investigating the impact of methane seepage on CWC mound sediments (Maignien et al, ; Pirlet et al, ; Templer, Wehrmann, Zhang, Vasconcelos, & McKenzie, ; Wehrmann et al, ).…”

Section: Introductionmentioning

confidence: 99%

Constraining the formation of authigenic carbonates in a seepage‐affected cold‐water coral mound by lipid biomarkers

et al. 2020

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Cold‐water coral (CWC) mounds are build‐ups comprised of coral‐dominated intervals alternating with a mixed carbonate‐siliciclastic matrix. At some locations, CWC mounds are influenced by methane seepage, but the impact of methane on CWC mounds is poorly understood. To constrain the potential impact of methane on CWC mound growth, lipid biomarker investigations were combined with mineralogical and petrographic analyses to investigate the anaerobic oxidation of methane (AOM) and authigenic carbonate formation in sediment from a seep‐affected CWC mound in the Gulf of Cadiz. The occurrence of AOM was confirmed by characteristic lipids found within a semi‐lithified zone (SLZ) consisting of authigenic aragonite, high‐magnesium calcite and calcium‐excess dolomite. The formation of high‐Mg calcite is attributed to AOM, acting as a lithifying agent. Aragonite is only a minor phase. Ca‐excess dolomite in the SLZ and upper parts may be formed by organoclastic sulphate reduction, favouring precipitation by increased alkalinity. The AOM biomarkers in the SLZ include isoprenoid‐based archaeal membrane lipids, such as abundant glycerol dibiphytanyl glycerol tetraethers (GDGTs) dominated by GDGT‐2. The δ13C values of GDGT‐2, measured as ether‐cleaved monocyclic biphytanes, are as low as −100‰ versus V‐PDB. Further, bacterial dialkyl glycerol diethers with two anteiso‐C15 alkyl chains and δ13C values of −81‰ are interpreted as biomarkers of sulphate‐reducing bacteria. The lipid biomarker signatures and mineralogical patterns suggest that anaerobic methane‐oxidizing archaea of the ANME‐1 group thrived in the subsurface at times of slow and diffusive methane seepage. Petrographic analyses revealed that the SLZ was exhumed at some point (e.g. signs of bioerosion of the semi‐lithified sediment), providing a hard substrate for CWC larval settlement. In addition, this work reveals that AOM‐induced semi‐lithification likely played a role in mound stabilization. Lipid biomarker analysis proves to be a powerful tool to disentangle early diagenetic processes induced by microbial metabolisms.

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“…Discoveries of new CWC ecosystems in the last two decades have fueled numerous studies on the various facets of these peculiar ecosystems, in particular, along the Atlantic and Mediterranean margins (e.g., Hovland et al, 1994;Van Rensbergen et al, 2005;Comas & Pinheiro, 2008). In 2002, a research cruise of the R/V Belgica off Larache (Morocco) led to the discovery of mounds in water depths of 500-600 m, topping a cliff, the Pen Duick Escarpment in the El Arraiche Mud Volcano Field (Van Rensbergen et al, 2005;Van Rooij et al, 2011), which is characterized by the occurrence of CWC structures. In 2006, another CWC province was discovered off Melilla in the Alboran Sea, Western Mediterranean (Comas & Pinheiro, 2008).…”

Section: Introductionmentioning

confidence: 99%

SCHACKOINELLA SPINA, A NEW BENTHIC FORAMINIFERAL SPECIES FROM COLD-WATER CORAL ECOSYSTEMS OF THE ALBORAN SEA AND THE GULF OF CÁDIZ

Stalder

Székely-Szabolcs

Kateb

et al. 2015

Journal of Foraminiferal Research

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Schackoinella spina n. sp. has been found in the eastern Alboran Sea at five different stations in water depths ranging from 258-330 m, as well as in one 532 m deep station in the Gulf of Cádiz, north-eastern Atlantic Ocean. Three stations have been sampled with a giant box core (BC) and two stations with a gravity core (GC) system. The sediments of the BCs and the GCs are characterized by cold-water coral (CWC) debris and a high abundance of biogenic components (e.g., bryozoans, echinoderms, bivalves, gastropods, serpulids, foraminifera). The surface samples from the BCs were treated with an ethanol-rose Bengal solution following standardized sampling protocol. In the BC samples the specimens of Schackoinella spina n. sp., were collected from the surface (0-1 cm). In particular, one BC sample (MD13-3456BC) contained six live (stained) specimens and an abundance of non-stained specimens (46 per 50 cm 3 sediment). The new species was found at several sediment depth intervals corresponding to a Holocene age.The occurrence of this small (60-140 mm) species in the Alboran Sea and Gulf of Cádiz has likely been overlooked in this region. Although not straightforward, the presence of this species in association with cold-water coral fragments and its absence in fine-grained pelagic sediments may indicate a relationship with this ecosystem.

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Cold-water coral mounds on the Pen Duick Escarpment, Gulf of Cadiz: The MiCROSYSTEMS project approach

Cited by 57 publications

References 63 publications

The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea

The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea

Constraining the formation of authigenic carbonates in a seepage‐affected cold‐water coral mound by lipid biomarkers

SCHACKOINELLA SPINA, A NEW BENTHIC FORAMINIFERAL SPECIES FROM COLD-WATER CORAL ECOSYSTEMS OF THE ALBORAN SEA AND THE GULF OF CÁDIZ

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