Results 91 to 100 of about 5,840 (173)

Chemosynthetic Organic Matter Reveals a Protracted Episode of Past Methane Seepage Activities at a Newly Discovered Cold Seep Site (Mannar Basin) Off the East Coast of India

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract Here, we present organic geochemical evidence of past methane‐seepage events in a sediment core retrieved from a recently discovered methane cold‐seep site off Mannar Basin, east coast of India. The significant negative C‐isotope excursion of organic matter (δ13CTOC) in the seep core compared to a reference non‐seep core suggests a substantial
Ankita Ghosh, Aninda Mazumdar, Mohd. Sadique, Aditya Peketi, Anjali Zatale, Kalyani Sivan, Sharmila Ravindran Pillai, Aman Sparsh   +7 more
wiley   +1 more source

Evidence for anaerobic oxidation of methane in sediments of a freshwater system (Lago di Cadagno) [PDF]

, 2017
Anaerobic oxidation of methane (AOM) has been investigated in sediments of a high alpine sulfate-rich lake. Hot spots of AOM could be identified based on geochemical and isotopic evidence. Very high fractionation of methane (α=1.031) during oxidation was
Boetius, Antje, Knittel, Katrin, Lösekann-Behrens, Tina, Schubert, Carsten J., Tonolla, Mauro, Vazquez, Francisco   +5 more
core  

Metagenomic and geochemical characterization of pockmarked sediments overlaying the Troll petroleum reservoir in the North Sea [PDF]

, 2012
Background Pockmarks (depressions in the seabed) have been discovered throughout the world’s oceans and are often related to hydrocarbon seepage. Although high concentrations of pockmarks are present in the seabed overlaying the Troll oil
Haverkamp, Thomas H, Håvelsrud, Othilde E, Jakobsen, Kjetill S, Kristensen, Tom, Rike, Anne G   +4 more
core   +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

Diverse Cooccurring Metabolisms Support Sulfur and Methane Cycling in Wetland Surficial Sediments

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 9, September 2025.
Abstract The Prairie Pothole Region (PPR) of North America contains millions of small depressional wetlands with some of the highest methane (CH4) fluxes ever reported in terrestrial ecosystems. In saturated soils, two conventional paradigms are (a) methanogenesis is the final step in the redox ladder, occurring only after more thermodynamically ...
Emily K. Bechtold, Danhui Xin, Maricia Pacheco, Brandy M. Toner, William A. Arnold, Yu‐Ping Chin, Michael J. Wilkins   +6 more
wiley   +1 more source

Methane emission and consumption at a North Sea gas seep (Tommeliten area) [PDF]

Biogeosciences, 2005
The Tommeliten seepage area is part of the Greater Ekofisk area, which is situated above the Tommeliten Delta salt diapir in the central North Sea (56°29.90' N, 2°59.80' E, Norwegian Block 1/9, 75 m water depth).
H. Niemann, H. Niemann, M. Elvert, M. Hovland, B. Orcutt, A. Judd, I. Suck, I. Suck, J. Gutt, S. Joye, E. Damm, K. Finster, A. Boetius, A. Boetius   +13 more
doaj  

Carbonate-hosted methanotrophy represents an unrecognized methane sink in the deep sea [PDF]

, 2014
The atmospheric flux of methane from the oceans is largely mitigated through microbially mediated sulphate-coupled methane oxidation, resulting in the precipitation of authigenic carbonates. Deep-sea carbonates are common around active and palaeo-methane
Levin, Lisa A., Marlow, Jeffrey J., Orphan, Victoria J., Steele, Joshua A., Thurber, Andrew R., Ziebis, Wiebke   +5 more
core   +1 more source

An experimental study on short-term changes in the anaerobic oxidation of methane in response to varying methane and sulfate fluxes [PDF]

Biogeosciences, 2009
A major role in regulation of global methane fluxes has been attributed to the process of anaerobic oxidation of methane (AOM), which is performed by consortia of methanotrophic archaea and sulfate reducing bacteria.
G. Wegener, A. Boetius
doaj  

Metabolically active microbial communities in marine sediment under high-CO2 and low-pH extremes [PDF]

, 2012
Sediment-hosting hydrothermal systems in the Okinawa Trough maintain a large amount of liquid, supercritical and hydrate phases of CO2 in the seabed. The emission of CO2 may critically impact the geochemical, geophysical and ecological characteristics of
A Boetius, A Chao, A Miyashita, A Pernthaler, A Teske, Antje Boetius, CJ Krebs, D de Beer, D de Beer, Dirk de Beer, E Pruesse, EC Pielou, EF DeLong, F Inagaki, F Inagaki, F Inagaki, F Wenzhöfer, Fumio Inagaki, Gregor Rehder, H Fossing, H Niemann, H Sakai, J Kallmeyer, J Kallmeyer, J Kallmeyer, J Lupton, J Lupton, JA Frank, JF Biddle, JM Hall-Spencer, JP Barry, JR Cole, K Grasshoff, K Knittel, K Knittel, K Nauhaus, K Shitashima, K Yanagawa, Katsunori Yanagawa, KE Fabricius, KG Lloyd, KG Lloyd, KH Nealson, Ko-ichi Nakamura, KZ House, Matthias Haeckel, Michinari Sunamura, NP Revsbech, P Jeroschewski, PD Schloss, R Suzuki, RI Amann, RI Amann, S Kleindienst, T Holler, T Hoshino, T Huber, T Nunoura, T Nunoura, Taiki Futagami, Takeshi Terada, Tatsuhiko Hoshino, TC Onstott, Tetsuro Urabe, U Konno, V Tunnicliffe, VJ Orphan, W Ludwig, W Manz, WJ Brazelton, Y Morono, Y Morono, YN Yu, Yuki Morono   +73 more
core   +1 more source

Archaeal lipostratigraphy of the Scotian Slope shallow sediments, Atlantic Canada [PDF]

Biogeosciences
The Scotian Slope in the North Atlantic Ocean extends for ∼ 500 km along the coast of Nova Scotia, Canada. Its surface sediments host microbial communities, which respond to complex geochemical drivers that not only include communication with the ...
N. Ahangarian, U. E. Umoh, N. MacAdam, A. MacDonald, P. Granados, J. N. Bentley, E. Redshaw, M. G. Fowler, V. Baghalabadi, V. Baghalabadi, G. T. Ventura   +10 more
doaj   +1 more source