Hybrid Carbonates: in situ abiotic, microbial and skeletal co ...
2020年9月1日 · Hybrid Carbonates are widespread and diverse in the marine geological record and reflect large-scale changes in carbonate precipitation through time. They also occur in fluvial and lacustrine carbonates, marine and non-marine reef systems, and methane seep deposits.
Carbonate Regeneration Using a Membrane Electrochemical Cell …
2022年11月28日 · We propose a new method of CO 2 regeneration from a carbonate capture solution (K 2 CO 3) through a driven anion exchange membrane (AEM) cell depolarized with hydrogen. This design overcomes the limitations in efficiency and current density that arise in direct gas phase separation of <1% concentration CO 2 using AEMs.
Recycled carbonates elevate the electrical conductivity of deeply ...
2023年7月29日 · We propose that carbonate-silicate cations exchange can alter the chemical composition of recycled carbonates, potentially impacting their stability and reducing the solidus temperature of...
Rare earth element geochemistry of carbonates as a proxy for …
2021年7月15日 · The rare earth elements and yttrium (REY) can enter carbonate lattices by replacing cations, which can be used to reconstruct the history of carbonate precipitation. The Ediacaran Doushantuo carbonates in South China and their equivalents in the world record the largest negative carbon isotope excursions (DOUNCE) in Earth history.
A Shorthand Notation for Carbonate Facies—Dunham Revisited
Carbonate facies can be described in a concise format that reads like an algebraic equation: CARBONATE FACIES = ( LITHIC DESCRIPTOR ) ( COMPOSITION ) ( TEXTURE ) ± REMARK . Lithic descriptors are portrayed by symbols for sedimentary structures, admixtures of argillaceous or arenaceous material, diagenetic features, and/or porosity.
Tetrahedrally coordinated carbonates in Earth’s lower mantle
2015年2月18日 · Here we present experimental evidence that under the sufficiently high pressures and high temperatures existing in the lower mantle, ferromagnesian carbonates transform to a phase with...
Tracing energy inputs into the seafloor using carbonate sediments
We applied our model to observations from the end-Permian mass extinction—a massive upheaval in ocean chemistry and biology—revealing an energetic equivalence between two hypothesized drivers of changing carbonate environments: a reduction in physical bioturbation increased carbonate saturation states in the oceans.
Carbonate Glossary - SEPM Strata
limestone: the most common carbonate rock, composed of more than 50% of calcium carbonate (Ca CO3) in the form of calcite or aragonite. limestone comprise large variety of rocks including chalk s, ooliths and bioclastic limestone .
A two-membrane electrodialytic carbonate eluent generator for …
2020年7月5日 · A two-membrane electrodialytic carbonate eluent generator (EDG) for ion chromatography (IC) is described. It is in a sandwich-like configuration, in which the central eluent channel is spatially isolated from two outer regenerant channels by stacked cation exchange membranes (CEMs) and anion exchange membranes (AEMs).
Carbonate Ion-Selective Membrane Electrode | Science - AAAS
A liquid membrane electrode has been developed with Nernstian response and a high selectivity for carbonate ion. The electrode responds rapidly to carbonate in the 10 -2 M to 10 -6 M range with a selectivity for carbonate over chloride, sulfate, and phosphate of at least 10 3 and negligible bicarbonate response.