Results 41 to 50 of about 1,157 (196)

Arctic deep water ferromanganese-oxide deposits reflect the unique characteristics of the Arctic Ocean [PDF]

, 2017
Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 18 (2017):
Cherkashov, Georgy, Fitzsimmons, Jessica N., Gartman, Amy, Hein, James R., Hutchinson, Deborah R., Jensen, Laramie T., Konstantinova, Natalia, Lam, Phoebe J., Mikesell, Mariah, Mizell, Kira, Till, Claire P., Xiang, Yang   +11 more
core   +1 more source

Rethinking Seawater Mo Isotope Mass‐Balance and the Sedimentary Mo Record

Paleoceanography and Paleoclimatology, Volume 41, Issue 3, March 2026.
Abstract A lingering misconception is that seawater 98Mo/95Mo ratios should have increased more or less linearly with the oxygenation of Earth's oceans. At the root of this hypothesis is the generalization that oxidizing marine sediments have a stronger affinity for lighter‐mass Mo isotopes than their reducing counterparts.
C. M. Ostrander, O. Dellwig
wiley   +1 more source

Heterogeneous marine environments diversify microbial-driven polymetallic nodule formation in the South China Sea

Frontiers in Marine Science
Most studies on the genesis of polymetallic nodules suggested that nodules in the South China Sea (SCS) are hydrogenetic; however, the complexity and the heterogeneity in hydrology and geochemistry of the SCS might cause different processes of nodule ...
Mingyan Lai, Qian Liu, Qian Liu, Qian Liu, Xiaogu Wang, Dong Sun, Lihua Ran, Xiaohu Li, Xiaohu Li, Xiaohu Li, Chenghao Yang, Bo Lu, Xue-Wei Xu, Chun-Sheng Wang, Chun-Sheng Wang, Chun-Sheng Wang   +15 more
doaj   +1 more source

Silicate and Carbonate Weathering Perturbation at the Eocene‐Oligocene Transition Recorded by Mg Isotopes

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract During the Eocene‐Oligocene Transition (ca. 34 Ma), the Earth underwent a dramatic decline in atmospheric CO2, global cooling, a deepening of the carbonate compensation depth (CCD), and the formation of a permanent ice sheet on Antarctica. The expansion of Antarctic glaciers eroded the underlying bedrock and increased the weathering flux to ...
Adam D. Sproson, Toshihiro Yoshimura, Shigeyuki Wakaki, Takahiro Aze, Yusuke Yokoyama, Tsuyoshi Ishikawa, Naohiko Ohkouchi   +6 more
wiley   +1 more source

High spatial resolution analysis of ferromanganese concretions by LA-ICP-MS†

Geochemical Transactions, 2002
A procedure was developed for the determination of element distributions in cross-sections of ferromanganese concretions using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS).
Ingri Johan, Baxter Douglas C, Rodushkin Ilia, Axelsson Mikael D, Öhlander Björn   +4 more
doaj   +1 more source

Cryptomelane formation from nanocrystalline vernadite precursor: a high energy X-ray scattering and transmission electron microscopy perspective on reaction mechanisms [PDF]

, 2015
International audienceBackground:Vernadite is a nanocrystalline and turbostratic phyllomanganate which is ubiquitous in the environ‑ment. Its layers are built of (MnO6)8− octahedra connected through their edges and frequently contain vacancies and(or ...
Fernandez-Martinez, Alejandro, Gloter, Alexandre, Grangeon, Sylvain, Lanson, Bruno, Marty, Nicolas,, Poulain, Agnieszka, Warmont, Fabienne   +6 more
core   +3 more sources

Gold Mineralizing Potential of the Late Triassic Calcareous, Carbonaceous and Sulfide‐Rich Sedimentary Rocks of the Isatomae Formation in the South Kitakami Belt, Japan

Resource Geology, Volume 76, Issue 1, January/December 2026.
Isatomae Formation illustrating mineralogical and geochemical characteristics. (a) Overview of the Isatomae Formation, showing the marine anoxic environment and related biogenic processes. (b) Deposition of metal‐rich Fe oxyhydroxides were transformed into sulfides through diagenesis and low grade metamorphism.
June Born Born, Yasushi Watanabe, Takuya Echigo, Yoshiaki Kon, Takumi Mimura   +4 more
wiley   +1 more source

A Hf‐Nd isotopic correlation in ferromanganese nodules

Geophysical Research Letters, 1998
The 176Hf/177Hf ratio was measured on 34 ferromanganese nodules, mostly from the Atlantic ocean. The different ocean basins are isotopically distinct with the extreme compositions being less radiogenic in the Atlantic (єHf ∼ +1) than in the Pacific (єHf ∼ +9).
Francis Albarède, Antonio Simonetti, Jeffrey D. Vervoort, Janne Blichert‐Toft, Wafa Abouchami   +4 more
openaire   +3 more sources

Beyond the plains: deep-sea mining of polymetallic nodules on and around seamounts

Frontiers in Marine Science
Deep-sea mining management, scientific research, and public discourse have largely focused on polymetallic nodule extraction from abyssal plains. However, there is growing commercial interest in nodules on and around seamounts, with exploration and ...
Cherisse Du Preez, Cherisse Du Preez, Heidi Gartner, Sheryl Murdock, Verena Tunnicliffe   +4 more
doaj   +1 more source

Percent‐Level Copper Mineralisation Promoted by Copper‐Tolerant Iron‐Oxidising Bacteria in Circumneutral Mine Drainage

Environmental Microbiology, Volume 27, Issue 12, December 2025.
A neutrophilic Fe(II)‐oxidizing Gallionellaceae was isolated from circumneutral Cu mine drainage. It mediated Fe(III) biomineralization, resulting in pronounced Cu accumulation (up to 2 wt%) within the solid precipitates. ABSTRACT Geomicrobiology of copper (Cu) and iron (Fe) in circumneutral‐pH drainage from a Japanese Cu mine was investigated, with a ...
Kazuya Tanimoto, Shingo Kato, Kohei Tokunaga, Natsuko Hamamura, Moriya Ohkuma, Satoshi Mitsunobu   +5 more
wiley   +1 more source