A broad area densely covered by ferromanganese nodules was recently discovered around Minamitorishima (Marcus) Island, representing a high-potential metal resource, particularly for Co, Ni, Mo, and W. We studied 16 nodule samples from fields Island. To define the fine-scale chemostratigraphy of nodules, polished cross-sections were analyzed microfocus X-ray fluorescence. Our results show that g...

Abstract Areas of old and cold oceanic plate lack conventional volcanism have been assumed to be devoid submarine hydrothermal activity. However, petit-spot volcanoes are common in areas flexure such plates. Here, we report ferromanganese oxides dredged from the vicinity a volcano at 5.7 km water depth an area east Japan Trench. The bulk chemical, lead isotopic mineralogical compositions sample...

This study investigated ferromanganese oxide (Fe-Mn oxide) precipitated on porifera located the tabletop of Magellan seamount (OSM17, 1571 m depth) in western Pacific. As growth rate Fe-Mn is several mm/Myr and skeletons are difficult to preserve posthumously, geochemical mineralogical studies have not yet been conducted this topic. oxides from a morphological differentiation general deposits b...

Abstract The production, transport, and deposition of mineral dust exert major influences on climate change Earth’s biogeochemical cycles. Furthermore, their imprint, as recorded in pelagic sediments, provides an avenue for determining past changes terrestrial aridity atmospheric circulation patterns response to global change. Here, by examining geochemical magnetic data obtained from a ferroma...

The context to this paper is the difficulty – recognised by the Conference of the Parties (COP)of the Convention on Biological Diversity – of protecting deep seabed genetic resources and of conserving and sustainably using biodiversity in marine areas beyond the limits of national jurisdiction. The COP has identified a number of actions including the establishment of networks of marine protecte...

A 10 μm particle of cuprous gold was found in the phosphate-argillaceous matrix a three-layer Fe-Mn crust dredged from Guyot Alba Magellan Seamount (Pacific Ocean). The studied with scanning electron microscope at Institute Volcanology and Seismology, Far East Branch Russian Academy Sciences. is represented by an admixture platinum (up to 3.1 wt % Cu up 1.7 Pt). composition impurities suggests ...

Well-preserved mycelia of fungal- or saprolegnia-like biota mineralised by ferromanganese oxides were found for the first time in long bones of Late Cretaceous dinosaurs from the Gobi Desert (Nemegt Valley, Mongolia). The mycelia formed a biofilm on the wall of the bone marrow cavity and penetrated the osteon channels of the nearby bone tissue. Optical microscopy, Raman, SEM/EDS, SEM/BSE, elect...

The speciation of Mn, Fe, As and Zn in a fast-growing (0.02mm/yr), shallow-marine ferromanganese nodule has been examined by micro X-ray fluorescence, micro X-ray diffraction, and micro X-ray absorption spectroscopy. This nodule exhibits alternating Fe-rich and Mn-rich layers reflecting redox variations in water chemistry. Fe occurs as two-line ferrihydrite. The As is strictly associated with F...