Anoxic and iron-rich (ferruginous) conditions prevailed in the ocean under the low-oxygen
atmosphere that occurred through most of the Archean Eon. While euxinic conditions (ie …

Molybdenum in sedimentary rocks and sediments has evoked interest as a paleo-
environmental indicator of reducing conditions. This application demands better …

Abstract Rogoznica Lake, on the Adriatic coast of Croatia, undergoes vertical mixing in
autumn, but quickly restratifies and becomes intensely sulfidic during the succeeding 11 …

Pyrite, or iron disulfide, is the most common sulfide mineral on the Earth's surface and is
widespread through the geological record. Because sulfides are mainly produced by sulfate …

Evidence for low pO2 and a ferruginous ocean characterize the mid‐Proterozoic (1.8–0.8
Ga). Considerations of redox sources and sinks imply that generation of O2 via organic …

Iron isotopes have been extensively used to trace the history of microbial metabolisms and
the redox evolution of the oceans. Archean sedimentary rocks display greater variability in …

The availabilities of iron and phosphorus have considerably impacted biological productivity
in past and present natural aquatic environments, and therefore have been key regulators of …

Volcanic lakes pose specific hazards inherent to the presence of water: phreatic and
phreatomagmatic eruptions, lahars, limnic gas bursts and dispersion of brines in the …

Reductive immobilization of uranium by the stimulation of dissimilatory metal-reducing
bacteria (DMRB) has been investigated as a remediation strategy for subsurface U (VI) …

Microbial methane oxidation-or methanotrophy-is a key control of the global methane
budget on Earth, and perhaps in other planetary systems. Here, we explore the potential role …