scholarly journals Study of Deep-Ocean Ferromanganese Crusts Ore Components

2021 ◽  
Author(s):  
Alla A. Novakova ◽  
Dmitrii S. Novikov
Keyword(s):  
Lower Layer ◽  
Deep Ocean ◽  
Ferromanganese Crust ◽  
Layer By Layer ◽  
Ferromanganese Crusts ◽  
The Pacific ◽  
Bacterial Mats ◽  
The Pacific Ocean ◽  
Mn Oxides ◽  
Crystallization Degree

A complex layer-by-layer morphology and phase analysis of a ferromanganese crust aged about 70 million years, extracted from the rise of the Magellan Mountains of the Pacific Ocean, was carried out using several physics methods: digital optical microscopy, scanning electron microscopy with high resolution, X-ray fluorescence and diffraction analysis and Mossbauer spectroscopy. This analysis showed that the crust is an association of several minerals with various dispersion and crystallization degree, between which fossilized bacterial mats with Fe- and Mn- oxides are located. These phenomena indicate the biogenic nature of the crust. Changes in the crusts phase composition from the lower layer to the upper layer indicate changes in the external environmental conditions during their formation.

scholarly journals Isolation of Tellurite- and Selenite-Resistant Bacteria from Hydrothermal Vents of the Juan de Fuca Ridge in the Pacific Ocean

2002 ◽  
Vol 68 (9) ◽  
pp. 4613-4622 ◽  
Author(s):  
Christopher Rathgeber ◽  
Natalia Yurkova ◽  
Erko Stackebrandt ◽  
J. Thomas Beatty ◽  
Vladimir Yurkov
Keyword(s):  
Hydrothermal Vents ◽  
Deep Ocean ◽  
Juan De Fuca Ridge ◽  
Resistant Bacteria ◽  
Ocean Water ◽  
Bacterial Films ◽  
The Pacific ◽  
Juan De Fuca ◽  
The Pacific Ocean ◽  
Reducing Bacteria

ABSTRACT Deep-ocean hydrothermal-vent environments are rich in heavy metals and metalloids and present excellent sites for the isolation of metal-resistant microorganisms. Both metalloid-oxide-resistant and metalloid-oxide-reducing bacteria were found. Tellurite- and selenite-reducing strains were isolated in high numbers from ocean water near hydrothermal vents, bacterial films, and sulfide-rich rocks. Growth of these isolates in media containing K2TeO3 or Na2SeO3 resulted in the accumulation of metallic tellurium or selenium. The MIC of K2TeO3 ranged from 1,500 to greater than 2,500 μg/ml, and the MIC of Na2SeO3 ranged from 6,000 to greater than 7,000 μg/ml for 10 strains. Phylogenetic analysis of 4 of these 10 strains revealed that they form a branch closely related to members of the genus Pseudoalteromonas, within the γ-3 subclass of the Proteobacteria. All 10 strains were found to be salt tolerant, pH tolerant, and thermotolerant. The metalloid resistance and morphological, physiological, and phylogenetic characteristics of newly isolated strains are described.

Uranium isotope systematics of ferromanganese crusts in the Pacific Ocean: Implications for the marine 238 U/ 235 U isotope system

2014 ◽  
Vol 146 ◽  
pp. 43-58 ◽  
Author(s):  
Kosuke T. Goto ◽  
Ariel D. Anbar ◽  
Gwyneth W. Gordon ◽  
Stephen J. Romaniello ◽  
Gen Shimoda ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Uranium Isotope ◽  
Ferromanganese Crusts ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Isotope System ◽  
Isotope Systematics

Cobalt, nickel, and copper in ore minerals of cobalt-bearing ferromanganese crusts from the Magellan Seamounts of the Pacific Ocean

2013 ◽  
Vol 450 (1) ◽  
pp. 566-570 ◽  
Author(s):  
G. V. Novikov ◽  
I. V. Vikent’ev ◽  
M. E. Mel’nikov ◽  
O. Yu. Bogdanova ◽  
N. I. Eremin
Keyword(s):  
Pacific Ocean ◽  
Ferromanganese Crusts ◽  
Magellan Seamounts ◽  
Cobalt Nickel ◽  
The Pacific ◽  
Ore Minerals ◽  
The Pacific Ocean

Flotation of cobalt-rich ferromanganese crust from the Pacific Ocean

1991 ◽  
Vol 4 (5-6) ◽  
pp. 535-551 ◽  
Author(s):  
W.C. Hirt ◽  
D.A. Rice ◽  
M.B. Shirts
Keyword(s):  
Pacific Ocean ◽  
Ferromanganese Crust ◽  
The Pacific ◽  
The Pacific Ocean

Magnetite magnetofossils record biogeochemical remanent magnetization in hydrogenetic ferromanganese crusts

Geology ◽  
2020 ◽  
Vol 48 (3) ◽  
pp. 298-302 ◽  
Author(s):  
Wei Yuan ◽  
Huaiyang Zhou ◽  
Zhenyu Yang ◽  
James R. Hein ◽  
Qunhui Yang
Keyword(s):  
Remanent Magnetization ◽  
Deep Ocean ◽  
Natural Remanent Magnetization ◽  
Paramagnetic Resonance ◽  
Ferromanganese Crusts ◽  
Transmission Electron ◽  
The Pacific ◽  
Genetic Mechanisms ◽  
Geomagnetic Polarity ◽  
Fine Resolution

Abstract Records of natural remanent magnetization (NRM) and geomagnetic polarity reversals preserved within ferromanganese (Fe-Mn) crusts, together with the application of fine-resolution magnetostratigraphic analysis, have been successfully demonstrated. However, because Fe-bearing precipitates or minerals are thought to be either oxides and/or hydroxides precipitated from ambient oxic seawater or detrital minerals, the magnetic properties of the ferromagnetic minerals and the genetic mechanisms remain controversial; moreover, the origin of the NRM is unclear. Here, we show that nanometer-scale magnetite crystals found in Fe-Mn crusts from the Pacific Ocean and South China Sea are magnetosome fossils based on their narrow size range, chain arrangement, chemical purity, and crystallographic perfection, as indicated by transmission electron microscopy. Furthermore, our new data from rock magnetic and electron paramagnetic resonance analyses, combined with a previously reported micro-magnetostratigraphic sequence, indicate that magnetotactic bacteria and their post-mortem remains contribute to a biogeochemical remanent magnetization of Fe-Mn crusts. In addition, the results provide evidence for a previously unappreciated pathway for the biogeochemical cycling of iron in the deep ocean.

The first find of visible gold in ferromanganese crusts of the Pacific Ocean

2013 ◽  
Vol 449 (2) ◽  
pp. 422-426 ◽  
Author(s):  
E. V. Mikhailik ◽  
A. I. Khanchuk ◽  
P. E. Mikhailik ◽  
N. N. Barinov ◽  
N. V. Zarubina
Keyword(s):  
Pacific Ocean ◽  
Ferromanganese Crusts ◽  
The Pacific ◽  
The Pacific Ocean

scholarly journals Comparative geochemistry of four ferromanganese crusts from the Pacific Ocean and significance for the use of Ni isotopes as paleoceanographic tracers

2016 ◽  
Vol 189 ◽  
pp. 214-235 ◽  
Author(s):  
Bleuenn Gueguen ◽  
Olivier Rouxel ◽  
Marie-Laure Rouget ◽  
Claire Bollinger ◽  
Emmanuel Ponzevera ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Ferromanganese Crusts ◽  
The Pacific ◽  
The Pacific Ocean

Evidence for biogenic processes during formation of ferromanganese crusts from the Pacific Ocean: Implications of biologically induced mineralization

Micron ◽  
2009 ◽  
Vol 40 (5-6) ◽  
pp. 526-535 ◽  
Author(s):  
Xiao-hong Wang ◽  
Ute Schloßmacher ◽  
Filipe Natalio ◽  
Heinz C. Schröder ◽  
Stephan E. Wolf ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Ferromanganese Crusts ◽  
The Pacific ◽  
The Pacific Ocean

scholarly journals Isolation of Aerobic Anoxygenic Photosynthetic Bacteria from Black Smoker Plume Waters of the Juan de Fuca Ridge in the Pacific Ocean

1998 ◽  
Vol 64 (1) ◽  
pp. 337-341 ◽  
Author(s):  
Vladimir Yurkov ◽  
J. Thomas Beatty
Keyword(s):  
Photosynthetic Bacteria ◽  
Deep Ocean ◽  
Juan De Fuca Ridge ◽  
Black Smoker ◽  
Light Harvesting Complex ◽  
The Pacific ◽  
Juan De Fuca ◽  
The Pacific Ocean ◽  
Anoxygenic Photosynthetic Bacteria

ABSTRACT A strain of the aerobic anoxygenic photosynthetic bacteria was isolated from a deep-ocean hydrothermal vent plume environment. The in vivo absorption spectra of cells indicate the presence of bacteriochlorophyll a incorporated into light-harvesting complex I and a reaction center. The general morphological and physiological characteristics of this new isolate are described.

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