Results 171 to 180 of about 264,922 (250)

Mössbauer and ESR Studies of Polymetallic Nodules

physica status solidi (a), 1990
Ces spectres Mossbauer, enregistres a la temperature de l'azote liquide et a temperature ambiante, sont constitues de larges doublets symetriques bien resolus. On montre que deux doublets se chevauchent. Le doublet interieur correspond a Fe 3+ au site tetrahedrique, le doublet exterieur a Fe 3+ au site ...
S. Swami, V. K. Agarwal, S. S. Sharma, J. Varma   +3 more
openaire   +1 more source

Tubotomaculum: a bacterially-mediated polymetallic nodule

2019
Since the 50s of the last century, several authors have investigated the nature of Tubotomaculum: enigmatic Mn-Fe mineralizations occurring in the latest Oligocene – Early Miocene varicoloured clays of the western Mediterranean area. Some authors regarded these structures as fossil traces[1], as fossil corals covered by Fe-oxides and manganite[2], or ...
S. Bernardini, A. Abbassi, F. Bellatreccia, P. Cipollari, D. Cosentino, M. del Gallo, E. Mugnaioli, A. Sodo, M. N. Zaghloul   +8 more
openaire   +7 more sources

Microplastic contamination in deep-sea sediments and polymetallic nodules: Insights from the Clarion-Clipperton Zone, Pacific Ocean.

Marine Pollution Bulletin
This study investigates MPs in sediments and polymetallic nodules collected from the Clarion Clipperton Zone (CCZ) in the Pacific Ocean, using samples collected during a deep-sea mining exploration.
A. C. Ronda, M. E. Adaro, L. Villar-Muñoz, J. P. Tomba, Elisa Baldrighi   +4 more
semanticscholar   +1 more source

Computer axial tomography investigation of polymetallic nodules

Marine Geology, 1997
Abstract Polymetallic nodules collected from the Clarion-Clipperton region of the North Pacific Ocean have been investigated by using a SIEMENS SOMATROM HiQ computer tomograph. The reconstructed tomographies show much details in the internal structure of the nodules, such as nucleus shape and origin, primary and secondary growth surfaces, highly ...
O.G. Duliu, M.S. Tufan, S.A. Szobotka
openaire   +1 more source

Geochemistry of REE and Other Critical Elements in Deep-Sea Polymetallic Nodules from Interoceanmetal (IOM) Exploration Area in Eastern Part of Clarion–Clipperton Fracture Zone, NE Pacific

Minerals
Deep-sea Fe-Mn polymetallic nodules formed nowadays at the deep-sea ocean floor were evaluated as promising critical raw materials (CRMs). Here, we report results of polymetallic nodules from the H22_NE block of the Interoceanmetal (IOM) exploration area
A. Hikov, Z. Milakovska, Irena Peytcheva, V. Stoyanova, Elitsa Stefanova, Tomasz Abramowski, M. Kadiyski, Silvia Chavdarova, Milen Stavrev, D. Dimitrova   +9 more
semanticscholar   +1 more source

Effects of Microwave Energy and MnO2 from Deep-Sea Polymetallic Nodules as an Oxidizing Agent on the Leaching of Chalcopyrite Concentrate

Minerals
The mineral chalcopyrite (CuFeS2) is inherently resistant to conventional leaching techniques, necessitating the intensification of the leaching process to achieve efficient metal recovery.
M. Laubertová, O. Velgosová, J. Pirošková, Jaroslav Briančin   +3 more
semanticscholar   +1 more source

Metallurgical Processing of Polymetallic Ocean Nodules

2017
During the last five decades metallurgical processing of polymetallic nodule is of global interest—as well as a challenge—for researchers, and industries. This has generated a vast knowledge base, but till now there is no commercial operation. Some of the main reasons are: (1) lack of a techno-economically feasible mining operation, (2) poor economics ...
R. P. Das, S. Anand
openaire   +1 more source

Exploration for polymetallic nodules in the Indian ocean

Ocean Development & International Law, 1988
Abstract A study of polymetallic nodules in the Indian Ocean taken up as an R & D Project has been extended into an exploratory programme for nodule resources. Recognition of India as a Pioneer Investor by the UNCLOS led to the acceleration of the programme to meet time targets. Planning and coordination ensured accuracy and success of the programme by
H.N. Siddiquie, P.S. Rao
openaire   +1 more source

Composition, Formation, and Occurrence of Polymetallic Nodules

2017
Manganese nodules occur as two-dimensional deposits in abyssal plains of all major oceans. In the Clarion-Clipperton Zone of the northeast equatorial Pacific alone, the amount of nodules is estimated to 21 billion tons indicating the huge potential of this deposit type.
T. Kuhn, A. Wegorzewski, C. Rühlemann, A. Vink   +3 more
openaire   +1 more source

Full Mission Bridge Simulations of Bulk Carrier Approach for Unsheltered Offshore Transshipment of Polymetallic Nodules

Offshore Technology Conference
The abyssal plain of specific deep ocean environments hold prolific amounts of polymetallic nodules that contain critical minerals needed by the growing and developing worldwide population.
A. Barr, M. Taha, S. Flamen, J. heiler
semanticscholar   +1 more source