105 documents found, page 1 of 11
Preliminary deep-sea data analysis collected at Gloria seamount, Azores-Biscay ...
Tojeira, Inês; Pinto-Ribeiro, Luísa; Rafael, Teresa; Albuquerque, Mónica; Simões, Maria; Calado, António; Afonso, Andreia; Ramos, Bruno; Souto, MiguelThis project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 818123 (iAtlantic project). This output reflects only the authors’ views and the European Union cannot be held responsible for any use that may be made of the information contained herein.; The present study provides the first results of the exploratory research campaign to Gloria se...
Deep sourced magma and ore-metal mobility in the D. João de Castro submarine vo...
Marques, Ana Filipa; Madureira, Pedro; Zajacz, Zoltan; Hu, Siyu; Pinto Ribeiro, LuísaThe D. João de Castro is a submarine volcano with known hydrothermal activity located in the Terceira ultra-slow spreading rift within the Azores triple junction (ATJ). Several well-known mafic and ultramafic rock-hosted seafloor hydrothermal systems lay along the Mid-Atlantic Ridge, to the north and to the south of the Azores platform, yet little is known about seafloor hydrothermal activity, ore-metal availab...
Geology of parts of the central and eastern Clarion Clipperton Zone
Parianos, John; O'Sullivan, Anthony; Madureira, PedroThe Clarion Clipperton Zone(CCZ) hosts th emost valuable deposit of polymetallic nodules yet discovered. International Seabed Authority exploration contractors, such as Tonga Offshore Mining Limited, Nauru Ocean Resources Incorporated and Marawa Research and Exploration Limited, routinely conducship-based 12kHz multibeam echosounder surveys overall or parts of their exploration contract areas. This is often sup...
Geomorphology of the Clarion Clipperton Zone, tropical North Pacific Ocean
Parianos, John; Madureira, PedroThe Clarion Clipperton Zone (CCZ) hosts a valuable deposit of polymetallic nodules. Understanding the geology of this deposit is key to its effective exploration and future mining. Interpretation of satellite derived bathymetry elucidates large scale geomorphological units and structural units that characterize the area.The Main Map is includes distinct plains, rises, and lows of abyssal hills, steps and a trou...
Interplay of deep-marine sedimentary processes with seafloor morphology offshor...
Roque, Cristina; Hernándes-Molina, Javier; Madureira, Pedro; Quartau, Rui; Magalhães, Vitor; Brito, Pedro; Vásquez, Tomás; Somoza, LuísThe deep-water sedimentary processes and morphological features offshore Madeira Island, located in the Central-NE Atlantic have been scantly studied. The analysis of new multibeam bathymetry, echo-sounder profiles and few multichannel seismic reflection profiles allowed us to identify the main geomorphologies, geomorphic processes and their interplay. Several types of features were identified below 3800 m wate...
Multidisciplinary Scientific Cruise to the Northern Mid-Atlantic Ridge and Azor...
Somoza, Luis; Medialdea, Teresa; González, Javier; Calado, António; Afonso, Andreia; Albuquerque, Mónica; Bettencourt, Renato; Blasco, IkerThis work presents the preliminary result of the multidisciplinary cruise EXPLOSEA2 surveying the northern Mid-Atlantic Ridge and Azores Archipelago from 46 300 N to 38 300 N aboard the R/V Sarmiento de Gamboa and ROV Luso over 54 days (June 11 to July 27, 2019). In this cruise report, we detail the geophysical, hydrographic, geological, oceanographic, ecological, and microbiological data acquired and a brief o...
The Interactive Role of Hydrocarbon Seeps, Hydrothermal Vents and Intermediate ...
Somoza, Luis; Rueda, José; Sanchez-Guillamón, Olga; Medialdea, Teresa; Rincón-Tomás, Blanca; González, Francisco; Palomino, Desirée; Madureira, PedroIn this work, we integrate five case studies harboring vulnerable deep-sea benthic habitats in different geological settings from mid latitude NE Atlantic Ocean (24–42º N). Data and images of specific deep-sea habitats were acquired with Remoted Operated Vehicle (ROV) sensors (temperature, salinity, potential density, O2, CO2, and CH4). Besides documenting some key vulnerable deep-sea habitats, this study shows...
High-resolution multibeam bathymetry of the northern Mid-Atlantic Ridge at 45–4...
Somoza, Luis; Medialdea, Teresa; González, Javier; Marchancoses, Sara; Candón, Jose; Cid, Constantino; Calado, António; Afonso, AndreiaThis work presents a new high-resolution multibeam bathymetric map of a segment of active deep sea-floor spreading in the Atlantic Ocean, the northern Mid-Atlantic Ridge (MAR) at 45–46º N. New high-resolution bathymetry data were acquired using an Atlas multibeam echosounder onboard the research vessel Sarmiento de Gamboa during the EXPLOSEA-2 survey in 2019. The final map of the MAR (50 m cell grid size) at th...
Low-temperature, shallow-water hydrothermal vent mineralization following the r...
González, Javier; Rincón-Tomás, Blanca; Somoza, Luis; Santofimia, Esther; Medialdea, Teresa; Madureira, Pedro; López-Pamo, Enrique; Hein, JamesHydrothermal iron (Fe)-rich sediments were recovered from the Tagoro underwater volcano (Central Atlantic) that formed during the 2011–2012 volcanic event. Cruises in 2012 and 2014 enabled the monitoring and sampling of the early-stage establishment of a hydrothermal system. Degassing vents produced acoustic flares imaged on echo-sounders in June 2012, four months after the eruption. A novel hydrothermal vent s...
Foundations and trends of high resolution energy dispersive PIXE (HiRED-PIXE)
Reis, Miguel; Carvalho, A; Taborda, A; Chaves, PA; Conceição, Patrícia; Madureira, PedroHigh Resolution Particle Induced X-ray Emission, for short HR-PIXE, dates back to 1977 and is, therefore, nearly as old as standard PIXE itself. Until roughly ten years ago, High Resolution PIXE (HR-PIXE) work used only wavelength dispersive spectrometers (WDS). The installation, in 2008, of an X-ray Microcalorimeter Spectrometer, XMS at CTN (ITN at the time) 3MV tandetron, altered this situation and, as can be...