http://hdl.handle.net/10174/999 2026-04-04T09:55:24Z 2026-04-04T09:55:24Z Barnhill, Kelsey Vinha, Beatriz Smith, Alycia de Jonje, Danielle Gaurisas, Daniela Segura, Roger Madureira, Pedro Albuquerque, Mónica Veerle, Huvenne Orejas, Covadonga Gunn, Vikki http://hdl.handle.net/10174/39531 2025-10-29T00:29:56Z 2023-01-01T00:00:00Z

Title: Ship-to-shore training for active deep-sea capacity development Authors: Barnhill, Kelsey; Vinha, Beatriz; Smith, Alycia; de Jonje, Danielle; Gaurisas, Daniela; Segura, Roger; Madureira, Pedro; Albuquerque, Mónica; Veerle, Huvenne; Orejas, Covadonga; Gunn, Vikki Abstract: Sailing on scientific expeditions as an early career researcher (ECR) offers the beneficial opportunity to gain field experience and training. However, the number of available berths to achieve the scientific goals of an expedition limits the number of onboard participants. Telepresence and remote learning can be utilized to increase the number of active participants, broadening the reach of capacity development. The 2021 iMirabilis2 expedition on board the Spanish Research Vessel Sarmiento de Gamboa used telepresence to virtually involve ECRs from several countries in deep-sea science. One year post-expedition, a survey of onshore participants was conducted to assess and quantify the effectiveness of the peer-to-peer ECR ship-to-shore scheme. During the expedition, live, interactive training via WhatsApp and Zoom was utilized by onshore ECRs more than traditional static, unidirectional methods of blog posts and pre-recorded videos. All respondents either agreed or strongly agreed that the scheme provided an inclusive and accessible platform to share deep-sea science. These results suggest similar schemes could be used to supplement shorter-duration at-sea-training, used prior to a seagoing experience to better prepare ECRs, or to allow members of the science community unable to join an expedition in person to actively participate remotely, increasing inclusivity.

2023-01-01T00:00:00Z Roque, Cristina Hernández-Molina, Javier Brito, Pedro Madureira, Pedro Quartau, Rui Magalhães, Vitor Carrara, Gabriela http://hdl.handle.net/10174/39522 2025-10-29T00:27:00Z 2023-01-01T00:00:00Z

Title: Contourite depositional systems offshore Madeira Island: Decoding the deepwater circulation since the Late Cretaceous to the Quaternary in the NE-Central Atlantic. Authors: Roque, Cristina; Hernández-Molina, Javier; Brito, Pedro; Madureira, Pedro; Quartau, Rui; Magalhães, Vitor; Carrara, Gabriela Abstract: There is still a great unawareness about the deep-water circulation in the NE-Central Atlantic since the Late Cretaceous. The morphology, sedimentary stacking pattern and distribution of contourite depositional systems have been widely used as paleoceanographic indicators, given clues about the relative velocity and pathways of bottom currents past-circulation. We present here evidence of a new contourite features developed in the NE-Central Atlantic offshore Madeira Island between ∼3000 m and ∼ 4950 m water depth. These features allowed us to define two Contourite Depositional Systems (CDSs). The dataset used in our work is composed of multichannel reflection seismic profiles and DSDP and ODP sites for the chronostratigraphic framework. The seismic stratigraphy analysis allowed the identification of six seismic units (U1–U6) and a sub-unit (U6a) separated by erosional discontinuities (D1–D6). The acoustic basement corresponds to oceanic crust located in the Cretaceous Magnetic Quite Zone (∼120 Ma to 84 Ma), but basalts drilled at DSDP Site 136 near Madeira Island, indicate an age of about 106 Ma. Sedimentary deposits from seismic units are interpreted as pelagic (unit U1; Early Cretaceous); contourite (U2 to U6; Late Cretaceous to Quaternary); and mass transport deposits (U6a; Quaternary). These seismic units characterize the CDSs from Late Cretaceous (Campanian?), resting unconformably on pelagic sediments of probable Aptian to Santonian age. The CDS-1 (U2 to U4) was formed from Late Cretaceous (Campanian?) to Middle Miocene and the CDS-2 (U5 and U6) was deposited from Middle Miocene to Quaternary. They are bounded by major erosional surfaces and characterized by giant elongated mounded contourite drifts (Drift 1 and Drift 2, respectively). Presently, CDS-1 is inactive and buried by pelagic sediments. Conversely, CDS-2 outcrops between ∼3000 and 4800 m water depth on the lower slope of Madeira plateau. These results reveal that this region of the NE-Central Atlantic has been swept by long-term northward bottom currents. We propose that the most plausible water masses responsible for these bottom-currents and drifts generation have been the Southern Component Water (SCW) and more recently the Antarctic Bottom Water (AABW). Consequently, the onset of the first incursion of the SCW was near the end of Late Cretaceous, probably in the Campanian. Since the late Eocene, the AABW would have a dominant role in this region of the NE-Central Atlantic. Assuming that during cool periods, the AABW had a greater volume and circulated shallower than 4000 m, we hypothesized that CDS-2 has been mainly active during these periods. On the contrary, during warmer periods, the AABW circulates deeper (>4000 m) and thus contourite deposition associated with the AABW shifted to deeper water depths. Presently the CDS-2 can be considered as a relict feature. Therefore, the Madeira CDCs represents a unique and very promising sedimentary archive for reconstructing deep-water masses circulation and their variability in the NE-Central Atlantic since the end of Cretaceous through the Quaternary, where the oceanic seafloor irregularities have been key in controlling the water masses and bottom currents behavior.

2023-01-01T00:00:00Z Tojeira, Inês Pinto Ribeiro, Luísa Rafael, Teresa Albuquerque, Mónica Simões, Maria Calado, António Afonso, Andreia Ramos, Bruno Souto, Miguel Bettencourt, Renato Rodrigues, Vasco Costa, Lino Cabral, Henrique Madureira, Pedro http://hdl.handle.net/10174/39517 2025-10-29T00:25:28Z 2023-01-01T00:00:00Z

Title: Preliminary deep-sea data analysis collected at Gloria seamount, Azores-Biscay Rise Authors: Tojeira, Inês; Pinto Ribeiro, Luísa; Rafael, Teresa; Albuquerque, Mónica; Simões, Maria; Calado, António; Afonso, Andreia; Ramos, Bruno; Souto, Miguel; Bettencourt, Renato; Rodrigues, Vasco; Costa, Lino; Cabral, Henrique; Madureira, Pedro Abstract: The present study provides the first results of the exploratory research campaign to Gloria seamount (summit at 45.03°N, 15.54°W), a newly identified seamount in the NE Atlantic. New multibeam bathymetry and an 8 h remote operated vehicle footage and photography data were compiled and analyzed to give the first insights on the geological nature and benthic megafauna assemblages of Gloria seamount. Footage evidenced three distinct seafloor coverage areas, ranging from unconsolidated fine sediment with ripple marks, to increasingly coarser-grain sediment with large blocks, to outcrops with steep slopes along successive ridges, locally exhibiting volcanic structures. The deep-sea benthic assemblages differed with depth (2700−2450 m) and seafloor substrate type. In sediment habitats, pink holothurians (Elpidiidae) and brittle stars (Ophiuroidea) were recorded, whereas in hard substrates, sponges (Hexactinellida and Demospongiae) and stalked crinoids (Crinoidea) were mixed with distinct coral specimens, such as bamboo corals (Isidiidae) and Coralliidae (Scleralcyonacea). The integration of these data contribute to the geo-habitats knowledge of an unexplored seamount.

2023-01-01T00:00:00Z Marino, Egidio Gonzalez, Javier Khun, Thomas Madureira, Pedro Somoza, Luis Medialdea, Teresa Lobato, A. Miguel, C. Reyes, J. Oeserf, M. http://hdl.handle.net/10174/39439 2025-10-16T09:58:40Z 2023-01-01T00:00:00Z

Title: Factors controlling rare earth element plus yttrium enrichment in Fe–Mn crusts from Canary Islands Seamounts (NE Central Atlantic). Authors: Marino, Egidio; Gonzalez, Javier; Khun, Thomas; Madureira, Pedro; Somoza, Luis; Medialdea, Teresa; Lobato, A.; Miguel, C.; Reyes, J.; Oeserf, M. Abstract: Marine minerals are important because concentrate in their structure high contents of strategic and critical elements as rare earth elements. Forty-two samples from eight seamounts of Canary Islands Seamount Province (CISP) have been analyzed in order to evaluate their rare earth elements plus yttrium contents (REY). Highest contents of REY are related to hydrogenetic minerals and essentially Fe-vernadite (on average 3000 μg/g). Diagenetic minerals, on the other hand, show the lowest REY contents with an average content of 260 μg/g. These differences also depend on the growth rates, hydrogenetic minerals with growth rates between 0.5 and 5 mm/Ma allow the incorporation of more REY in their structure. REY contents in studied samples varies depending several factors associated with depth and location, shallowest samples presumably growth near or within the oxygen minimum zone are the most enriched with up to 3800 μg/g due to local enrichment of these elements and the slowest growth rate promoted by the reduced ambient conditions while deeper samples around 3000 m water depth show 2800 μg/g. Location also has a role in REY contents essentially due to the presence of different currents. Samples faced to north are exposed to the more oxygenated waters of the North Atlantic Deep Water and are depleted in REY if compared with deeper samples facing to south to the more oxic Antarctic Bottom Water. Finally, the case of study made on three different seamounts of the CISP show that Fe–Mn crusts from this area could provide on average 130 tons of hydrometallurgical recovered REY (based on 1 km2 areal crust coverage) together with interesting quantity of several other strategic and base elements as Mn, Co, Ni, Cu, V, Mo between others.

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