Results 51 to 60 of about 1,157 (196)

Almost billfish: convergent longirostry, micro‐dentition, and possible glandular sinuses in a large teleost fish from the Upper Cretaceous of Northern Italy

Journal of Anatomy, Volume 247, Issue 6, Page 1109-1130, December 2025.
A fossil rostrum fragment of a large teleost fish from the Upper Cretaceous of Northern Italy reveals remarkable anatomical convergences with Cenozoic and Recent billfishes (marlins, swordfishes, and akin). The extinct group Plethodidae independently acquired a long snout, micro‐teeth, and oil‐gland sinuses well before the evolution of true billfishes.
Giovanni Serafini, Jürgen Kriwet, Tommaso Toldo, Eliana Fornaciari, Jacopo Amalfitano, Giorgio Carnevale   +5 more
wiley   +1 more source

The Reduction of Group 6–8 Transition Metal Oxides with Hydrogen—From Ore Smelting to Reaction Pathways#

European Journal of Inorganic Chemistry, Volume 28, Issue 30, October 22, 2025.
As the reduction of transition metal oxides by coal poses a significant climate risk, the use of alternative reducing agents such as hydrogen is becoming increasingly important. This review summarizes the current knowledge of the reduction pathways of transition metal oxides from groups 6 to 8.
Michael Häger, Simon Keilholz, Holger Kohlmann   +2 more
wiley   +1 more source

Petrography and stratigraphic Os isotopic ages of ferromanganese nodules from the Northwest Pacific east of Minamitorishima Island

Journal of Asian Earth Sciences: X
The area offshore of Minamitorishima Island, Northwestern Pacific Ocean, contains large amounts of seafloor mineral resources such as ferromanganese (Fe–Mn) nodules, Fe–Mn crusts, and rare-earth element and yttrium (REY)-rich muds.
Tatsuo Nozaki, Kosuke T. Goto, Yutaro Takaya, Kazuhiko Shimada, Akira Owada, Gen Shimoda, Jun-Ichi Kimura, Qing Chang, Tetsuji Onoue, Shiki Machida, Teruaki Ishii, Kenji Shimizu, Naoto Hirano, Kazuhide Mimura, Moei Yano, Junichiro Ohta, Yasuhiro Kato   +16 more
doaj   +1 more source

Internal features, mineralogy and geochemistry of ferromanganese nodules from the Gulf of Cadiz: the role of the Mediterranean Outflow Water undercurrent [PDF]

, 2010
A large suite of Fe–Mn nodules (561 samples) were recovered during the Anastasya 2001 cruise (TASYO project) along the continental margin of the Gulf of Cadiz (Eastern Central Atlantic), at the confluence of the Mediterranean Sea with the Atlantic ...
Torres Pérez-Hidalgo, Trinidad José
core   +1 more source

Ultrafine-scale magnetostratigraphy of marine ferromanganese crust [PDF]

, 2011
http://geology.geoscienceworld.org/content/39/3/227.full.pdf+htmlHydrogenetic ferromanganese crusts are iron-manganese oxide chemical precipitates on the seafloor that grow over periods of tens of millions of years.
Baudenbacher, Franz J., Fong, Luis E., Harder, Rene, Joshima, Masato, McBride, Krista K., Miyagi, Isoji, Oda, Hirokuni, Shantz, Chris, Usui, Akira, Weiss, Benjamin P.   +9 more
core   +1 more source

The Stability of Manganese Oxides Under Laser Irradiation During Raman Analyses: II. Layer Structures

Journal of Raman Spectroscopy, Volume 56, Issue 10, Page 1072-1088, October 2025.
Manganese oxides are important geomaterials with diverse technological applications. Here, we investigate the behaviour of the most common Mn oxides with layer structures under irradiation by a 532‐nm laser, with intensity ranging from 23 µW/µm2 to 36.8 mW/µm2.
Simone Bernardini, Giancarlo Della Ventura, Luigi Jovane, Armida Sodo, Boriana Mihailova   +4 more
wiley   +1 more source

Integrated geochemical and biomarker signature of fast-growing Fe-Mn nodules from the Gulf of Finland, Baltic Sea

Frontiers in Marine Science
Ferromanganese (Fe-Mn) nodules, characterized by rapid growth and diverse morphologies, are widespread on the Baltic Sea seafloor. This study provides a comprehensive analysis of the bulk elemental composition, internal structures, and organic matter (OM)
Natalia Shulga, Peter Perfilov, Konstantin Ryazantsev   +2 more
doaj   +1 more source

Constructing a cave sediment stratigraphy for the Dachstein Massif sheds light on landscape evolution (Eastern Alps)

The Depositional Record, Volume 11, Issue 4, Page 1166-1195, September 2025.
Five large Alpine cave systems on the Dachstein (Austria) were investigated and 35 sediment profiles or outcrops between 860 m a.s.l. and 1945 m a.s.l. were analysed. An altitude‐dependent overall stratigraphy is established and depositional conditions and palaeo‐environments are reconstructed.
Franziska Holzer, Lukas Plan, Susanne Gier   +2 more
wiley   +1 more source

In-situ analysis of polymetallic nodules from the clarion-Clipperton zone, Pacific Ocean: implication for controlling on chemical composition variability

Frontiers in Marine Science
Polymetallic ferromanganese nodules (PMNs) in the Clarion-Clipperton Zone (CCZ) exhibit significant spatial variability in chemical composition, which complicates exploration efforts and increases associated costs.
Jie Li, Yinjia Jin, Hao Wang, Kehong Yang, Zhimin Zhu, Xingwei Meng, Xiaohu Li   +6 more
doaj   +1 more source

Discovery of ferromanganese hydrocarbon-related nodules associated with the Meknes mud volcano (Western Moroccan margin) [PDF]

, 2012
A suite of ferromanganese nodules were sampled during the MVSEIS-2008 cruise aboard of the R/V Hespérides in the flanks of Meknes mud volcano (Moroccan margin, NE Central Atlantic).
Ortiz Menéndez, José Eugenio, Torres Pérez-Hidalgo, Trinidad José   +1 more
core