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 5 of 5 for “"REE+Y"”.
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Petrogenesis del batolito de la península Antártica, costa occidental del extremo norte de la península Antártica e islas aledañas: implicancias tectónicas
… de un Batolito Cordillerano. Los patrones de REE y aracnogramas sugieren una fuente mántélica tipo peridotita o gabro, en una corteza de espesor entre 35 y 40 km. La composición isotópica 87Sr/86Sr y 143Nd/144Nd de los plutones sugiere una evolución temporal de las fuentes, haciéndose más …
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The stratigraphy and geochemistry of the rapitan iron formation, Northwest Territories and Yukon, Canada
… Rapitan iron formation are reassessed. Using the REE+Y and the redox-sensitive elements Mo and U, it is shown that the Rapitan iron formation was deposited in a partially restricted basin from biogenically reduced iron under variable redox conditions. Elemental Re and Mo isotopes further show that …
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La risposta delle parasequenze carbonatiche alle variazioni relative del livello del mare sulla base di indicatori climatici
… Plasma-Mass Spectrometry, XRD e terre rare - REE-Y). Le analisi bio- e magneto-stratigrafiche (in collaborazione con INGV di Roma) su 79 campioni dai diversi affioramenti sono state volte a definire l’età deposizionale. Infine, analisi isotopiche e di geochimica organica sono state svolte …
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Lithium, Beryllium and Boron in High-Pressure Metamorphic Rocks from Syros (Greece)
… metamorphic rocks from the island of Syros (Greece) that are interpreted as parts of subducted oceanic crust, equilibrated at about 1.5-2.0 GPa and 500 °C were analysed. A first group of samples (Group 1) includes rocks that preserved the parageneses formed at the pressure peak of …