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Showing 1 to 20 of 36 for “"strontium isotope"”.
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Strontium isotope tracing of prehistoric human mobility in France
… as we go back in time. The application of stable isotopes in archaeological research has revolutionised palaeomobility studies by providing independent data, which can be used to evaluate models of migration, trade, and cultural change. This research project explores the use of strontium isotope …
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Strontium isotope tracing of prehistoric human mobility in France
… as we go back in time. The application of stable isotopes in archaeological research has revolutionised palaeomobility studies by providing independent data, which can be used to evaluate models of migration, trade, and cultural change. This research project explores the use of strontium isotope …
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Groundwater hydrogen, oxygen, and strontium isotope variation of Hout Bay Valley, Cape Town
… systems in semi-arid regions. Monitoring stable isotope compositions (δD and δ18O) in the hydrosphere can aid hydrogeologists in understanding groundwater processes. The δD and δ18O of 148 water samples (groundwater, rainwater, and stream water) from Hout Bay, a coastal valley 20 km south-west of …
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Natural variations in strontium isotope abundances in minerals: a possible geologic age method
Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology, 1952.
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Petrographic and strontium isotope analysis on rare earth element bearing minerals in Hicks Dome, Southern Illinois
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Testing formation of the Torres del Paine Intrusive Complex, Southern Chile via in situ strontium isotope analyses: Insights into granite formation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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The Development of an Analytical Technique to Measure Stable and Radiogenic Strontium Isotope Ratios Using Thermal Ionization Mass Spectrometry with the Double Spike Method
An analytical method using a strontium “double spike” enriched in both 84Sr and 87Sr was developed to measure the n(87Sr)/n(86Sr) and n(88Sr)/n(86Sr) isotope ratios using a thermal ionization mass spectrometer. The results obtained for the SRM987 reference material using this technique are in …
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A background investigation into the feasibility of heavy stable isotopes (87Sr/86Sr) as source tracers of early hominids
Heavy stable strontium isotope ratios (⁸⁷Sr/⁸⁶Sr) may be used to characterize the habitat choices of early hominids. The basis for this approach is that different geological substrata may have a characteristic range of ⁸⁷Sr/⁸⁶Sr ratios in the available soil strontium pool. This range may be …
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Geology of Aeolian and marine deposits in the Saldanha Bay region, Western Cape, South Africa
… deposits were obtained with radiocarbon dating, strontium isotope stratigraphy and biostratigraphy.
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Fluid relationships in the Northern Gulf of Mexico using dissolved ion concentrations and strontium isotopes
… metal and halogen fluid concentrations and strontium isotope ratios from ten sites on the Gulf of Mexico (GoM) continental slope were compared to identify the variations in chemistry. Geochemical discrepancies are interpreted as coming from chloride sources, fluid mixing and fluid diagenesis …
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Petrography and geochemistry of Cambrian-Ordovician marine cements: Implications for Early Paleozoic cementation processes and seawater chemistry
… mottled luminescence and Fe, Mn, Sr, Mg, stable isotope and strontium isotope values indicative of recrystallization. In contrast, marine low-magnesium calcite equant cements from the Cow Head Group typically are nonluminescent, suggesting that they have not recrystallized. These cements exhibit …
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Origin of net-veined and mixed-magma ring intrusions
… and geochemical (major, trace element and strontium isotope) analyses show these intrusions represent commingling of highly evolved tholeiitic magmas ranging from ferrobasalt through basaltic-andesite and andesite, to rhyodacite and rhyolite. The magmas represent both fractionates of …
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Paleoenvironmental Reconstruction of the Late Cretaceous Eastern Gulf Coastal Plain in Georgia and Alabama
… than modern terrestrial MAT. Stable oxygen isotope data from molluscan carbonate indicate mean sea surface temperature (SST) of 26.8 °C for the Santonian, 23.5°C for the early Campanian, and 28.8°C for the late Campanian. These paleotemperature compare with the modern Gulf Coast mean SST of …
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Stable isotope geochemistry of the Okenyenya igneous complex, Namibia : constraints on contamination and fluid interaction
… suite, are consistent with the attainment of isotope equilibrium and largely closed system conditions. The majority of the temperatures calculated by conventional mineral-pair thermometers are spurious, as a result of oxygen isotope diffusion during slow cooling. Closure temperatures for …
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Neogene to quaternary foraminifera from the western margin of southern Africa
… Pliocene to Pleistocene phosphatic sediments. Strontium isotope stratigraphy and planktic foraminifera biostratigraphy provide age control of the Namibian shelf sediments. The planktic indicator species Globoquadrina dehsicens and Globigerinoides bisphericus support strontium isotope …
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A study of the berg Aukas-type Pb-Zn-V deposits in the Otavi mountain land, Namibia
… and basin evolution. The application of isotope (Sr , O, C) techniques as regards to timing and mechanisms of ore-forming processes, as a possible tool in exploration, is especially emphasized in this study. Detailed petrographic and isotope-geochemical investigations were carried out in …
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U/Pb Zircon Ages of Plutons from the Central Appalachians and GIS-Based Assessment of Plutons with Comments on Their Regional Tectonic Significance
… Mafic rocks are approximately 430 Ma. Initial strontium isotopic ratios and bulk geochemical analyses were also performed. These analyses show the bimodal nature of magmatism within this region. In order to facilitate management of geologic data, including radiometric ages, strontium isotope …
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