oxygen isotope
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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Oxygen isotope systematics of ordinary chondrite chondrules: insights into the inner solar system planetary reservoir
... For chondrule olivine from OCs the assumption that a sample is drawn from a single population is neither trivial nor obvious since chondrule olivine relict grains and chondrules with the same oxygen isotope ...
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Post mortem oxygen isotope exchange within cultured diatom silica
... The oxygen isotope composition of water used in each aliquot was monitored in order to account for any changes during the course of the experiment. A subsample of the initial water source was set aside ...
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Spatial patterns in the oxygen isotope composition of daily rainfall in the British Isles
... Spatial patterns in the oxygen isotope composition of daily rainfall in the British.. 1 Department of Earth Sciences, The University of Adelaide, Adelaide, South.[r] ...
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Reconstructing Fire Severity From the Oxygen-Isotope Compositions of Plant Char
... restricts oxygen movement to the interior of the sample, resulting in ideal conditions for char formation (Schumacher et ...for oxygen-isotope ...
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Stable oxygen isotope variability in two contrasting glacier river catchments in Greenland
... assess oxygen isotope dynamics in the Mittivakkat Gletscher river during the peak flow period when the sub- glacial drainage system is assumed to be well established, transporting the majority of meltwater ...
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Coupled nitrogen and oxygen isotope study of nitrate at a rural unlined landfill in Western Victoria, Australia
... The findings of this study reveal the extent of nitrogen transformations and biogeochemical cycling across a landfill leachate plume in a lithologically heterogeneous and shallow unconfined aquifer. Co- occurrence of ...
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Evolution of Pliocene climate cyclicity at Hole 806B (5-2 Ma); oxygen isotope record
... It is a history of both a cooling trend, with superimposed ice-volume and climate fluctuations of Milankovitch type, as well as a shift in the pattern of oxygen isotope fluctuations afte[r] ...
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The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces
... by precipitating silver phosphate and subsequent analysis on a thermal conversion elemental analyser at 1400°C, with the resultant carbon monoxide being mixed with a helium carrier gas passed through a gas chromatography ...
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Sulfur and oxygen isotope insights into sulfur cycling in shallow-sea hydrothermal vents, Milos, Greece
... Shallow-sea (5 m depth) hydrothermal venting off Milos Island provides an ideal opportunity to target transitions between igneous abiogenic sulfide inputs and biogenic sulfide production during microbial sulfate ...
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Abstract: Speleothem oxygen isotope records from the Caribbean, Central, and North America reveal
... Speleothem oxygen isotope records from the Caribbean, Central, and North America reveal climatic controls that include orbital variation, deglacial forcing related to ocean circulation and ice sheet ...
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Strontium and oxygen isotope evidence for the origin and movement of cattle at Late Neolithic Durrington Walls, UK
... Sr isotope data suggest that at least four distinct terrains are represented in the ...Wales. Oxygen isotope data indicate that the majority of the animals are likely to derive from western or ...
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Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions
... Another form of biogenic silica commonly found in sedi- ments is siliceous sponge spicules (structural elements which support the skeleton of the animal; phylum Porifera, classes Demospongiae and Hexactinellida). Sponge ...
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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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Triple oxygen isotope analysis of nitrate using isotope exchange cavity ringdown laser spectroscopy
... Triple oxygen isotope measurements ( 16 O/ 17 O/ 18 O) have become an important part of the geochemical toolkit over the past two decades, influencing fields such as atmospheric chemistry 1-4 , meteorites ...
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Photochemical and Dynamics Studies of Oxygen Isotope Exchange Reactions of CO2
... (98.5%), oxygen- atom abstraction (0.0004%), and oxygen isotope exchange ...The oxygen-atom abstraction yield is a lower limit because only a portion of the Newton sphere was ...The ...
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A 250 ka oxygen isotope record from diatoms at Lake El’gygytgyn, far east Russian Arctic
... Oxygen isotope records from ice-cores (Greenland-Ice-Core- Project members, 1993; Grootes et ...the oxygen isotope composition from la- custrine biogenic silica, ...best isotope proxy ...
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Ice-shelf – ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements
... on oxygen isotope ratio measure- ments made on the continental shelf in front of Fimbul Ice ...of oxygen, H 16 2 O and H 18 2 O, is used as a tracer for meteoric water input, and is especially ...
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The effects of dissolution on the silicon and oxygen isotope compositions of silica phytoliths
... of oxygen and silicon isotopes from a single 1mg ...silicon isotope results of a series of dissolution experiments conducted on phytolith silica and implications relating to the role of phytoliths in ...
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Water vapour source impacts on oxygen isotope variability in tropical precipitation during Heinrich events
... Tropical δ 18 O variability is often interpreted as an alter- ation in local precipitation. This inference is based on simple Rayleigh distillation models that predict that isotope ratios in precipitation are ...
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