A process-based geochemical framework for carbonate sediments during marine diagenesis
A significant proportion of marine calcium carbonate sediments are comprised of metastable
minerals that are susceptible to diagenetic alterations during burial. These reactions can …
minerals that are susceptible to diagenetic alterations during burial. These reactions can …
Effects of sodium and potassium concentrations on dolomite formation rate, stoichiometry and crystallographic characteristics
This study uses high temperature (215° C) dolomitization experiments to explore the effects
of sodium (Na) and potassium (K), two common constituents of natural fluids, on dolomite …
of sodium (Na) and potassium (K), two common constituents of natural fluids, on dolomite …
Characterizing the marine iodine cycle and its relationship to ocean deoxygenation in an Earth system model
K Cheng, A Ridgwell, DS Hardisty - Biogeosciences, 2024 - bg.copernicus.org
Iodine (I) abundance in marine carbonates (measured as an elemental ratio with calcium,
I/Ca) is of broad interest as a proxy for local/regional ocean redox. This connection arises …
I/Ca) is of broad interest as a proxy for local/regional ocean redox. This connection arises …
Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals
The distribution of dissolved iodine in seawater is sensitive to multiple biogeochemical
cycles, including those of nitrogen and oxygen. The iodine-to-calcium ratio (I/Ca) of marine …
cycles, including those of nitrogen and oxygen. The iodine-to-calcium ratio (I/Ca) of marine …
[HTML][HTML] Refining the carbonate-associated iodine redox proxy with leaching experiments
Iodate ions can substitute for carbonate in crystal lattices, which is why carbonate-
associated iodine (CAI) is increasingly being used to track redox-sensitive iodine species …
associated iodine (CAI) is increasingly being used to track redox-sensitive iodine species …
Dynamic redox conditions in Mesoproterozoic shallow seawater: Constraints from carbonate fabrics and geochemistry
The delayed eukaryote evolution during the mid-Proterozoic may have been linked to
prolonged low oxygen levels during this period. Two short oxygenation events have recently …
prolonged low oxygen levels during this period. Two short oxygenation events have recently …
Mineralogy-based stepwise dissolution of dolomitic limestone reveals high iodine content in water-column precipitated calcite and well‑oxygenated shallow seawater …
Abstract Carbonate I/(Ca+ Mg) has been used as a proxy to track shallow-seawater oxygen
levels through Earth's history. However, due to diagenetic alteration and homogenization of …
levels through Earth's history. However, due to diagenetic alteration and homogenization of …
Calcium isotopes support spatial redox gradients on the Tethys European margin across the Triassic-Jurassic boundary
The end-Triassic mass extinction was among the most severe biotic crises of the
Phanerozoic. It has been linked with the global expansion of marine anoxia, and the …
Phanerozoic. It has been linked with the global expansion of marine anoxia, and the …
More than deoxygenation: Linking iodate reduction to nitrogen, iron, and sulfur chemistry in reducing regimes
A striking feature of Oxygen Deficient Zones (ODZs) on the eastern boundary of the Pacific
Ocean are large subsurface plumes of iodide. Throughout the oceans, iodate is the …
Ocean are large subsurface plumes of iodide. Throughout the oceans, iodate is the …
A prominent oxygenation event in the late Mesoproterozoic broke the calm of the second half of the “Boring Billion”
The redox conditions on Earth's surface during the so-called “Boring Billion”(ca. 1.8–0.8 Ga)
were characterized by an overall low-oxygen background punctuated by pulsed …
were characterized by an overall low-oxygen background punctuated by pulsed …