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 8 of 8 for “"Fe isotope"”.
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Spatially controlled Fe isotope variations at Torres Del Paine
… trends of changing non-traditional stable isotope ratios in igneous rocks with differentiation index. We present new Fe isotope data for the Torres del Paine igneous complex in southern Chile. The multi-composition pluton consists of a 1.5 km vertical exposure of homogenous granite …
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Iron Isotope Cosmochemistry
… the 4th most abundant in the crust and mantle; Fe is involved in every stage of planetary formation and differentiation. Iron isotope ratios are robust process tracers used to understand the origin of the Solar System, planetary formation, and differentiation processes such as the moon-forming …
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Petrogenesis of natrocarbonatite at Ol Doinyo Lengai, East Africa—evidence from Fe and U isotope variations
… remains unresolved. We carried out Fe and U isotope analyses among a variety of ODL samples. Our sample set includes natrocarbonatite that erupted in 2005, 2 comingled tephras (mixture of natrocarbonatite and nephelinite) and a sequence of 8 nephelinite tephras that erupted in …
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Petrology and geochemistry of Sangeang Api and recent volcanism in the Sumbawa-Flores sector of the Sunda Arc: the response of along-arc geochemistry to subduction processes.
… compaction or post crystallisation intrusion. Fe-isotope studies of the Sangeang Api products shows that the lavas record δ⁵⁷Fe compositions (average = 0.099‰ ±0.051) typical of arc settings. Cumulate xenoliths record heavy Fe-isotope compositions compared to the lavas (mean δ⁵⁷Fegabbro = …
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Iron inputs from sediments to the oceans
… thesis explores the nature and ubiquity of iron (Fe) inputs from sediments to the<br/>oceans. In the last 10 years continental shelf sediments have become widely recognised<br/>as important vectors for dissolved Fe inputs to the oceans, where bacterial dissimilatory<br/>Fe-reduction (DIR) promotes …
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A heavy stable isotope approach to tracing mantle source and process
… part of this variability. Recently, heavy stable isotopes have been suggested as a new tool to complement existing tracers of mantle heterogeneity and lithology (e.g., major and trace elements, radiogenic isotopes), because mineral- and redox-specific equilibrium stable isotope fractionation …
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Investigation of iron isotope variability in the bimodal Aztec Wash Pluton, Eldorado Mountains, Nevada
… it also raises questions about the formation of features shared by many felsic intrusions, such as compositional zonation and the presence of significant volumes of relatively homogeneous granite. Water-rich temperature gradient experiments (Huang et al., 2009) have been able to produce …
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Understanding the evolution of compositional zoning in San Juan Volcanic Field ignimbrites using iron isotope ratios
… remain largely unknown. Here I present new iron (Fe) isotope ratio data along with 87Sr/86Sr ratios and major and trace elements for 37 samples from the SJVF with the goal of improved understanding of the origin of zoned ignimbrites. I sampled in detail the zoned 33.2 Ma Bonanza Tuff as well as …