Results 71 to 80 of about 1,096 (152)

Magma Differentiation, Phase Separation, and Volatiles: Factors Controlling Chemistry of Submarine Hydrothermal Fluids

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract Submarine hydrothermal systems are critical for global geochemical cycles. However, hydrothermal fluid chemistry is influenced by multiple overlapping processes, making it difficult to isolate the effects of individual factors. In this study, we applied independent component analysis (ICA) to a global database of hydrothermal fluids to extract
Keishiro Azami
wiley   +1 more source

Keeping Our Focus on the Subseafloor

Eos, 2017
Hard-pressed funding agencies wonder whether marine seismic facilities are worth the investment. A recent survey gives a resounding yes.
Nathan Bangs, James Austin Jr.
openaire   +1 more source

Sulfur Isotope Biogeochemistry Controlled by Sulfate Reduction Activity in Cold Seep Sediments

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract Cold seeps are unique deep‐sea ecosystems that play an important role in marine biogeochemical cycles. However, the dynamics and regulation of sulfur isotope biogeochemistry in seep sediments remain unconstrained. We investigated the geochemical characteristics of active seep sites, including the content and stable isotope composition of ...
Bing‐Zheng Wu, Jiarui Liu, Xiting Liu, Shi‐Hai Mao, Zhen Zhou, Qiao Liu, Gui‐Peng Yang, Samantha B. Joye, Guang‐Chao Zhuang   +8 more
wiley   +1 more source

Hydrothermally Induced Refractory DOC Sinks in the Deep Pacific Ocean

Global Biogeochemical Cycles, Volume 39, Issue 9, September 2025.
Abstract Dissolved organic carbon (DOC) constitutes the largest pool of reduced carbon in the global ocean, with important contributions from both recently formed and aged, biologically refractory DOC (RDOC). The mechanisms regulating RDOC transformation and removal remain uncertain though hydrothermal vents have been identified as sources and sinks ...
D. A. Hansell, C. R. German, C. A. Carlson, E. R. M. Druffel, W. J. Jenkins, S. Q. Lang, B. M. Toner   +6 more
wiley   +1 more source

Uranium Addition and Loss in Serpentinites: The Potential Role of Iron Oxides

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract Fluid‐mobile uranium serves as a tracer for water‐rock alteration in serpentinized mantle rocks, which constitute an important uranium reservoir. However, the mechanism for uranium addition, where uranium is hosted, and the stability of the uranium enriched material during subduction is not settled.
Emily H. G. Cooperdock, Juan Carlos de Obeso, Frank J. Pavia   +2 more
wiley   +1 more source

Influence of Transient Bottom Water Temperature Variations on Geothermal Heat Flow Measurements From the Bellingshausen Sea, West Antarctica, and the Baltic Sea

Journal of Geophysical Research: Oceans, Volume 130, Issue 8, August 2025.
Abstract Geothermal heat flow (GHF) data provide important constraints for ice‐sheet flow dynamics as GHF affects sliding conditions at the ice‐bed contact and englacial temperatures. However, marine measurements of the geothermal gradients can get distorted down to ∼3–10 m below seafloor by annual bottom water temperature variations.
Caroline Brand, Norbert Kaul, Mareen Lösing, Karsten Gohl   +3 more
wiley   +1 more source

Comparative study of subseafloor microbial community structures in deeply buried coral fossils and sediment matrices from the Challenger Mound in the Porcupine Seabight

Frontiers in Microbiology, 2011
Subseafloor sedimentary environments harbor remarkably diverse microbial communities. However, it remains unknown if the deeply buried fossils in these sediments play ecological roles in deep microbial habitats, or whether the microbial communities ...
Tatsuhiko eHoshino, Yuki eMorono, Takeshi eTerada, Hiroyuki eImachi, Timothy G Ferdelman, Fumio eInagaki   +5 more
doaj   +1 more source

Aerobic microbial life persists in oxic marine sediment as old as 101.5 million years

Nature Communications, 2020
The discovery of aerobic microbial communities in nutrient-poor sediments below the seafloor begs the question of the mechanisms for their persistence.
Yuki Morono, Motoo Ito, Tatsuhiko Hoshino, Takeshi Terada, Tomoyuki Hori, Minoru Ikehara, Steven D’Hondt, Fumio Inagaki   +7 more
doaj   +1 more source

In Situ Metabolic Rates of Alkane‐Degrading Sulphate‐Reducing Bacteria in Hydrocarbon Seep Sediments Revealed by Combining CARD‐FISH, NanoSIMS, and Mathematical Modelling

Environmental Microbiology, Volume 27, Issue 8, August 2025.
Sulphate‐reducing bacteria affiliated with clades SCA1, SCA2, and LCA2 were investigated using stable‐isotope incubations and in situ analysis at several hydrocarbon seep sites. Extrapolated rates of sulphate reduction and alkane degradation suggest that these clades play an important role at hydrocarbon seeps, contributing substantially to sulphur and
Sara Kleindienst, Lubos Polerecky, Rudolf Amann, Florin Musat, Katrin Knittel   +4 more
wiley   +1 more source

Dissociating Gas Hydrate Beneath the Hydrate Stability Zone

Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.
Abstract Vast amounts of carbon are stored beneath the seafloor in the form of methane hydrate. Hydrate is stable at moderate pressure and low temperature at a depth extending several hundred meters beneath the seafloor to the base of gas hydrate stability (BGHS) often marked by bottom simulating reflections (BSRs) in seismic profiles.
I. A. Pecher, A. E. Cook, E. A. Solomon, X. Wang, S. Han, M. Paganoni, M. Luo, K. U. Heeschen, D. D. McNamara, M. Nole, L. LeVay, K. Petronotis, P. M. Barnes, L. M. Wallace, D. M. Saffer   +14 more
wiley   +1 more source