Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"O-isotopes"”.
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Revisiting the palaeoenvironments of the South African hominid-bearing Plio Pleistocene sites : new isotopic evidence from Sterkfontein
… PlioPleistocene sites based on δ¹³C and δ¹⁸O isotopes extracted from enamel of fossil fauna. New isotopic results from Sterkfontein Members 4 and 5 are reported to supplement existing data from Makapansgat and Swartkrans in order to examine the changing environment from approximately 3 to 1.4 …
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Wintertime nitrate isotope dynamics in the Atlantic sector of the Southern Ocean
… patterns of the nitrogen (N) and oxygen (O) isotopes of seawater nitrate for the region south of Africa. Water column profile and underway surface samples collected in July 2012 span a range of latitudes from the subtropics to 57.8°S, just beyond the Antarctic winter sea-ice edge (56.7°S). …
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Variations in the stable isotope compositions of water vapor and precipitation in New Mexico : links to synoptic-scale weather
… a three story building. In addition, the D and O isotopes for 106 samples of surface water vapor and 40 samples of precipitation from the southwestern US were also measured. The relationship between the isotopic ratios of water vapor (δDv) and humidity, in the form of vertically integrated …
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The accretion of lower oceanic crust
… of the ocean crust, including Sr and O-isotopes, to investigate and quantify the role of hydrothermal circulation during the accretion of the ocean crust. The second method uses diffusion based geospeedometry techniques to determine cooling rates in the ocean crust. Samples from two …
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Evolution of continental crust in the Proterozoic : growth and reworking in orogenic systems
To understand the growth of continental crust, the balance between juvenile mantle derived extraction, infracrustal reworking and crustal recycling, needs to be estimated. Since the beginning of the century, the use of coupled in situ zircon U–Pb, Lu–Hf and O isotope analyses as a tool to address …
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Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia
Logging of cores of the Upper Permian and Lower Triassic Khuff Formation, Ghawar, Saudi Arabia, has allowed a high resolution sequence stratigraphic framework to be generated. The lithofacies of this huge, arid epeiric ramp succession include: subaqueous -and supratidal anhydrite, tidal flat …