Carbonate mound development in contrasting settings on the Irish margin

Land, Cees van der; Eisele, Markus Hermann; Mienis, Furu; Haas, H. de; Hebbeln, Dierk; Reijmer, John J.G.; Weering, Tjeerd Ce van

doi:10.1016/j.dsr2.2013.10.004

Cited by 34 publications

(22 citation statements)

References 49 publications

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“…Additionally, the ACCR would have been affected by a persistent strong flow (<0.3 m.sec −1 ) of the IWBC 42,46 that intensifies towards the northeast 62 , transporting cold AAIW. The size of the mounds and their long-term build-up may also be dependent on (1) the amount of sediment input driven by currents 11,63 ; (2) the mound capacity for sediment baffling 10 ; and (3) the enhancement of productivity conditions eventually leading to higher food availability 58,64,65 . In this sense, the basinward-dipping ACCR bulge, which is several metres above the average surrounding bathymetry, can attest to the ridge’s capacity to trap sediments.…”

Section: Discussionmentioning

confidence: 99%

The Alpha Crucis Carbonate Ridge (ACCR): Discovery of a giant ring-shaped carbonate complex on the SW Atlantic margin

Maly

Schattner

Lobo

et al. 2019

Sci Rep

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Recently acquired bathymetric and high-resolution seismic data from the upper slope of Santos Basin, southern Brazilian margin, reveal a major geomorphological feature in the SW Atlantic that is interpreted as a carbonate ridge - the Alpha Crucis Carbonate Ridge (ACCR). The ACCR is the first megastructure of this type described on the SW Atlantic margin. The ~17 × 11-km-wide ring-shaped ACCR features tens of >100-m-high steep-sided carbonate mounds protruding from the surrounding seabed and flanked by elongated depressions. Comet-like marks downstream of the mound structures indicate that the area is presently influenced by the northward flow of the Intermediate Western Boundary Current (IWBC), a branch of the Subtropical Gyre that transports Antarctic Intermediate Water. Abundant carbonate sands and gravels cover the mounds and are overlain by a biologically significant community of living and dead ramified corals and associated invertebrates. The IWBC acts as a hydrodynamic factor that is responsible for both shaping the bottom and transporting coral larvae. We contend that the ACCR was formed by upward fluid flow along active sub-surface faults and fractures that formed by lateral extension generated by the ascending movement of salt diapirs at depth. The ACCR provides an important modern and accessible analogue for a seabed carbonate build-up related to sub-surface hydrocarbon systems.

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Section: Discussionmentioning

confidence: 99%

The Alpha Crucis Carbonate Ridge (ACCR): Discovery of a giant ring-shaped carbonate complex on the SW Atlantic margin

Maly

Schattner

Lobo

et al. 2019

Sci Rep

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“…In contrast, off NW Morocco and Mauritania, CWC flourished during glacial conditions and went regionally extinct concurrent with the global warming of the recent interglacial (Wienberg et al, 2010(Wienberg et al, , 2018Frank et al, 2011). This pattern of climate change-driven regional variations in coral proliferation is not just valid for the recent interglacial and last glacial (i.e., the last ∼ 70,000 years), but can also be traced further back in time comprising previous glacial and interglacial stages (Frank et al, 2011;Raddatz et al, 2014b;Van der Land et al, 2014;Matos et al, 2017;Wienberg et al, 2018). Beside major changes in CWC proliferation linked to glacial/interglacial climate variability, CWC development has regionally also been interrupted on shorter time scales, lasting for a few hundreds to thousands of years during interglacial or glacial periods (e.g., Fink et al, 2015;Raddatz et al, 2016;Wienberg et al, 2018).…”

Section: The Concept Tipping Points Crossed In the Pastmentioning

confidence: 97%

“…In the geological past, this often is marked by regional extinctions and re-occurrences of CWC concomitant with changes in climate (e.g., Kano et al, 2007;Frank et al, 2011). Correlating such events, i.e., the crossing of tipping points, to the variability of paleoenvironmental parameters allows to identify key parameters that potentially control the (regional) vitality of CWC (e.g., Dorschel et al, 2005;Wienberg et al, 2010;Raddatz et al, 2014b;Van der Land et al, 2014;Victorero et al, 2016). Thus, studying the geological record of CWC reefs enhances our understanding about the response of CWC to past climatic changes.…”

Section: Introductionmentioning

confidence: 99%

The Fate of Cold-Water Corals in a Changing World: A Geological Perspective

et al. 2019

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As "ecosystem engineers," framework-forming scleractinian cold-water corals (CWC) build reefs that are unique biodiversity hotspots in the deep sea. Studies using common biological techniques such as correlating the spatial occurrence of the most common CWC species with modeled environmental conditions have revealed the ecological requirements and tolerances of these species. However, limited field observations and poorly understood geographical distribution patterns of the CWC restrict the application of existing knowledge toward assessing their fate (e.g., local extinction, newly established populations) under ongoing global change. Hence, the risk to cross ecological tipping points causing the demise (or establishment) of entire CWC reefs remains unclear. A major challenge is to identify the key environmental parameters (or stressors) having the potential to control CWC vitality by providing such tipping points. This is largely hampered by the overall lack of present-day observations of such tipping point crossings. However, evidence for such events is frequently preserved in geological records revealing that entire CWC ecosystems vanished or returned at specific moments in the past. Here, a geological approach is presented that by correlating geological CWC records with paleoceanographic data describing past environmental changes allows to identify a set of key environmental drivers that directly or indirectly control CWC vitality. Thus, by combining such a geological approach with common biological techniques (see above) to describe the ecological tolerance of the most important reefbuilding CWC has a great potential to better assess their future spatial distribution in times of accelerating global change and to improve the sustainable management of the important deep-sea ecosystems formed by CWC.

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“…These facies occurred in a systematic order within the cores, suggesting cyclic depositional environments that drive a rapid cycle of reef growth, disturbance and recovery. Van der Land et al (2014) reveal that the influx and types of material transported to cold-water coral mounds may have a direct impact on the carbonate mound accumulation rate and on postdepositional processes. Mound development rates and sediment composition of mounds at the SW Rockall Trough margin and the Galway mound in the Porcupine Seabight were investigated and compared.…”

Section: The Geological Recordmentioning

confidence: 99%