oxygen isotope composition
Seasonality of Holocene hydroclimate in the Eastern Mediterranean reconstructed using the oxygen isotope composition of carbonates and diatoms from Lake Nar, central Turkey
... Dean JR, Jones MD, Leng MJ, Sloane HJ, Roberts CN, Woodbridge J, Swann GEA, Metcalfe SE, Eastwood WJ and Yigitbasioglu H (2013) Palaeo-seasonality of the last two millennia reconstructed from the oxygen ...
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The triple oxygen isotope composition of phytoliths as a proxy of continental atmospheric humidity: insights from climate chamber and climate transect calibrations
... which isotope composition has been set to δ 18 O = ...the isotope composition of the sample gas was corrected on a daily basis (three quartz standards were analyzed per day) was ± ...
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Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions
... The oxygen isotope composition of siliceous sponge spicules and their application to palaeoenvironmental reconstructions is rela- tively understudied and ...
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The influence of oxygen isotope exchange between CO2 and H2O in natural CO2-rich spring waters : implications for geothermometry
... of oxygen isotope exchange with CO 2 , high temperature equilibration with bedrock minerals and mineral dissolution and precipitation reactions on the CO 2 -rich water isotopic ...the oxygen ...
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Environmental and taxonomic controls of carbon and oxygen stable isotope composition in Sphagnum across broad climatic and geographic ranges
... tissue oxygen isotopes reflect environ- mental conditions that control source water (rainfall, snow- fall, groundwater) as well as fractionation caused by evapo- ration prior to fixation, which is controlled by ...
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Environmental and taxonomic controls of carbon and oxygen stable isotope composition in Sphagnum across broad climatic and geographic ranges
... tissue oxygen isotopes reflect environ- mental conditions that control source water (rainfall, snow- fall, groundwater) as well as fractionation caused by evapo- ration prior to fixation, which is controlled by ...
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Sea Lamprey (Petromyzon marinus) in the Cheboygan River, Michigan, Watershed: Parasitic Feeding Ecology and Origin of Adults
... isotopic composition have been observed in inter- and intra-cellular water (Kreuzer-Martin et ...isotopic composition of each tissue type ...Isotopic composition of potential host species from Burt ...
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Determining the Authenticity of Artifacts by Oxygen Isotope Analysis
... the oxygen isotopic values pre- served in dated stalagmites from the Soreq Cave [18,19] to the oxygen isotopic values in the patina from artifacts purported to come from ...pared oxygen isotopic data ...
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New Identity of the Kimberlite Melt: Constraints from Unaltered Diamondiferous Udachnaya East Pipe Kimberlite, Siberia, Russia
... I consider that a prolonged evolution of the kimberlite magma by olivine crystallisation was responsible for a build-up of abundances of alkalies, chloride, carbonate, and sulphate components. As a result, the residual ...
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A global transition to ferruginous conditions in the early Neoproterozoic oceans
... Several lines of evidence suggest that S isotope data for both CAS and pyrite-S have not been affected by metamorphism or cross-contamination. All CAS data have been extracted from sediments with low Mn/Sr ratios, ...
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An experiment to assess the effects of diatom dissolution on oxygen isotope ratios
... Diatom dissolution experiments have previously been undertaken to assess structural changes in community composition [11,12,13] and alteration of oxygen and silicon isotope ratios [7,9] using a ...
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Photochemical and Dynamics Studies of Oxygen Isotope Exchange Reactions of CO2
... for isotope exchange. Opacity functions for the isotope exchange reaction showed a slight decrease in reaction probability at smaller impact parameters as the collision energy increased (see Figure ...
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Identification and characterization of a tomato introgression line with reduced wilting under drought
... then that plant growth can continue under conditions of soil water scarcity (Green and Cummins, 1974). Osmotic adjustment is under genetic control (Zhang et al., 1999) and has been shown to result from the biosynthesis ...
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Triple oxygen isotope analysis of nitrate using isotope exchange cavity ringdown laser spectroscopy
... Equilibration experiments were performed in Hungate type anaerobic culture tubes, 16x125mm, with Butyl stoppers and screwed cap (Fisher Scientific; no. 501215187). Nitrate salts were weighed to a precision of ±0.1 mg. ...
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Oxygen and Carbon Isotope Composition in Primary Carbonatites of the World: Data Summary and Linear Trends
... [2] Demény, A., Sitnikova, M.A. and Karchevsky, P.I. (2004) Stable C and O Isotope Compositions of Carbonatite Complexes of the Kola Alkaline Province: Phosco- rite-Carbonatite Relationships and Source ...
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Oxygen isotope composition of the final chamber of planktic foraminifera provides evidence of vertical migration and depth integrated growth
... when referencing seasonality, temperature is considered as the variable of interest. However, the tropics have relatively small seasonal temperature variability compared with higher latitudes, the core is situated along ...
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Developing a stable isotope approach to trace the sources and metabolism of phosphorus in freshwaters
... short isotope half-lives, perturbation of experimental systems associated with labelling, or the use of incubations which omit irregular events in natural ecosystems, such as seasonal algal blooms (Levine et ...
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Eruptive shearing of tube pumice: pure and simple
... 5. Oxygen and hydrogen isotope composition of tube pumice (stars; L: fresh glass, W: weathered sample), meteoric waters in equilibrium with the glasses, and present-day local me- teoric ...
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Oxygen isotope systematics of ordinary chondrite chondrules: insights into the inner solar system planetary reservoir
... (chemical composition, cooling rates, oxygen fugacity, petrography, dust enrichment) to form Type I and Type II chondrules from OCs could be envisioned considering that the protoplanetary disk midplane is ...
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New Identity of the Kimberlite Melt: Constraints from Unaltered Diamondiferous Udachnaya East Pipe Kimberlite, Siberia, Russia
... In a Rb-Sr isochron plot (Fig. 5.3), the data for bulk, L2, and residue of both samples define straight unmixing arrays that, if interpreted as isochrons, yield apparent ages of 351 ± 30 and 343 ± 20 Ma; pooling all six ...
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