Search Results - "Halevy, Itay"

Production, preservation, and biological processing of mass-independent sulfur isotope fractionation in the Archean surface environment by Halevy, Itay

“…Mass-independent fractionation of sulfur isotopes (S MIF) in Archean and Paleoproterozoic rocks provides strong evidence for an anoxic atmosphere before ∼2,400…”
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Questioning the Paradigm of a Phosphate‐Limited Archean Biosphere by Crockford, Peter, Halevy, Itay

“…The nature of Archean life remains one of the most contested topics in the study of Earth history. The debate may be formulated as follows: When did present…”
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Intracellular metabolite levels shape sulfur isotope fractionation during microbial sulfate respiration by Wing, Boswell A., Halevy, Itay

“…Significance Microbes can discriminate among metabolites that differ only in the stable isotopes of the same element. This stable isotope fractionation…”
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Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone by Pasquier, Virgil, Fike, David A., Halevy, Itay

“…Sulfur cycling is ubiquitous in sedimentary environments, where it mediates organic carbon remineralization, impacting both local and global redox budgets, and…”
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Geologic controls on phytoplankton elemental composition by Sharoni, Shlomit, Halevy, Itay

“…Planktonic organic matter forms the base of the marine food web, and its nutrient content (C:N:P ) governs material and energy fluxes in the ocean. Over Earth…”
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Theoretical estimates of equilibrium carbon and hydrogen isotope effects in microbial methane production and anaerobic oxidation of methane by Gropp, Jonathan, Iron, Mark A., Halevy, Itay

“…Microbial production and consumption of methane are widespread in natural and artificial environments, with important economic and climatic implications…”
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Influence of sulfate reduction rates on the Phanerozoic sulfur isotope record by Leavitt, William D., Halevy, Itay, Bradley, Alexander S., Johnston, David T.

“…Phanerozoic levels of atmospheric oxygen relate to the burial histories of organic carbon and pyrite sulfur. The sulfur cycle remains poorly constrained,…”
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Episodic warming of early Mars by punctuated volcanism by Halevy, Itay, Head III, James W.

“…Evidence for liquid water on the ancient Martian surface is at odds with a presumably cold climate. Aerosol modelling shows that warming by sulphur-bearing…”
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Nutrient ratios in marine particulate organic matter are predicted by the population structure of well-adapted phytoplankton by Sharoni, Shlomit, Halevy, Itay

“…A common assumption of a constant nitrogen-to-phosphorus ratio (N:P) of 16:1 in marine particulate organic matter (POM) appears to be invalidated by…”
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Dynamics of pyrite formation and organic matter sulfurization in organic-rich carbonate sediments by Shawar, Lubna, Halevy, Itay, Said-Ahmad, Ward, Feinstein, Shimon, Boyko, Valeria, Kamyshny, Alexey, Amrani, Alon

“…Organic-rich carbonate sediments are deposited in a range of environments today and in the geologic past. A significant part of organic matter (OM) degradation…”
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Sulfate Burial Constraints on the Phanerozoic Sulfur Cycle by Halevy, Itay, Peters, Shanan E., Fischer, Woodward W.

“…The sulfur cycle influences the respiration of sedimentary organic matter, the oxidation state of the atmosphere and oceans, and the composition of seawater…”
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Sulfur isotope fractionation between aqueous and carbonate-associated sulfate in abiotic calcite and aragonite by Barkan, Yigal, Paris, Guillaume, Webb, Samuel M., Adkins, Jess F., Halevy, Itay

“…Sulfate (SO42−) incorporated into calcium carbonate minerals enables measurements of sulfur (S) isotope ratios in carbonate rocks. This Carbonate Associated…”
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The geologic history of seawater oxygen isotopes from marine iron oxides by Galili, Nir, Shemesh, Aldo, Yam, Ruth, Brailovsky, Irena, Sela-Adler, Michal, Schuster, Elaine M, Collom, Christopher, Bekker, Andrey, Planavsky, Noah, Macdonald, Francis A, Préat, Alain, Rudmin, Maxim, Trela, Wieslaw, Sturesson, Ulf, Heikoop, Jeffrey M, Aurell, Marcos, Ramajo, Javier, Halevy, Itay

“…The oxygen isotope composition (δ O) of marine sedimentary rocks has increased by 10 to 15 per mil since Archean time. Interpretation of this trend is hindered…”
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Carbonates in the Martian meteorite Allan Hills 84001 formed at 18 ± 4 °C in a near-surface aqueous environment by Halevy, Itay, Fischer, Woodward W, Eiler, John M

“…Despite evidence for liquid water at the surface of Mars during the Noachian epoch, the temperature of early aqueous environments has been impossible to…”
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Explaining the Structure of the Archean Mass-Independent Sulfur Isotope Record by Halevy, Itay, Johnston, David T., Schrag, Daniel P.

“…Sulfur isotopes in ancient sediments provide a record of past environmental conditions. The long–time-scale variability and apparent asymmetry in the magnitude…”
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Sulfur Dioxide Climate Feedback on Early Mars by Halevy, Itay, Zuber, Maria T, Schrag, Daniel P

“…Ancient Mars had liquid water on its surface and a CO₂-rich atmosphere. Despite the implication that massive carbonate deposits should have formed, these have…”
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Editorial: The effects of early diagenesis in various marine environments on the stable isotope records of environmental conditions and biogeochemical processes by Lin, Zhiyong, Strauss, Harald, Zhao, Mingyu, Halevy, Itay

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Biologically induced initiation of Neoproterozoic snowball-Earth events by Tziperman, Eli, Halevy, Itay, Johnston, David T, Knoll, Andrew H, Schrag, Daniel P

“…The glaciations of the Neoproterozoic Era (1,000 to 542 MyBP) were preceded by dramatically light C isotopic excursions preserved in preglacial deposits…”
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Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane by Wegener, Gunter, Gropp, Jonathan, Taubner, Heidi, Halevy, Itay, Elvert, Marcus

“…The anaerobic oxidation of methane (AOM) is performed by methanotrophic archaea (ANME) in distinct sulfate-methane interfaces of marine sediments. In these…”
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Equilibration Times of Dissolved Inorganic Carbon During pH Transitions by Sade, Ziv, Hegyi, Shahar, Halevy, Itay

“…Equilibration times of dissolved inorganic carbon (DIC) depend on conversion reactions between CO 2 (aq) and the dissociation products of carbonic acid [ S =…”
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