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 7 of 7 for “"whole-rock data"”.
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Giant Plagioclase in the Steens Basalt, SE Oregon: Cumulate Entrainment Revealed by Textural and In Situ Chemical Analysis
… plagioclase compositional analyses with whole-rock data and computational modeling to explain systematic textural and chemical differences between plagioclase of the lower and upper Steens Basalt sub-sections. Lower Steens plagioclase are typically more chemically homogenous than upper …
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Anorthositic sills of the southern Adirondack Mountains of New York state
… of the sills and is related to the Oregon Dome. Whole rock data show that the gabbroic anorthosite and the rocks of the Thirteenth Lake Dome have a differentiation trend of minor iron enrichment, while the Wells gabbro, Oregon Dome and Snowy Mountain Dome have a trend of more extreme iron …
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Evolution of a Flood Basalt Crustal Magmatic System: In Situ Mineral Data and Computational Modeling of the Steens Basalt
… and 300,000 years. Major- and trace element whole rock data from 111 stratigraphically controlled samples from two vertical transects of Steens Mountain (SE Oregon) combined with mineral compositional data from a subset of these samples yield a time-transgressive record of commotional changes …
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Melting processes in small basaltic systems: the Auckland Volcanic Field, New Zealand
… small volume monogenetic system. New analyses of rocks have been added to the existing geochemical dataset of the AVF, including Sr-Nd-Pb isotopes and a subset of U-Th-Ra isotopes. In addition to a whole-field study, two case studies of well-exposed volcanic centres in the AVF are presented: …
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Documenting Mantle and Crustal Contributions to Flood Basalt Magmatism via Computational Modeling of the Steens Basalt, Southeast Oregon
… ~16.8 Ma in less than 300,000 years. Analytical data of flows from a 1 km vertical exposure at Steens Mtn. documents time-transgressive changes in composition of two geochemically distinct units: (1) lower Steens, MgO-rich lavas with lower incompatible trace element concentrations and …
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Trace Element Geochemistry of Volcanogenic Massive Sulfide Deposits in Archean Greenstone Belts: Implications for Metal Endowment and Geodynamic Settings
… including a wide range of different host rocks and crustal settings. The range of settings is reflected in the trace metal signatures of their ores. This study examines the trace element geochemistry of pyrite from 55 different Archean volcanogenic massive sulfide (VMS) deposits in Canada …
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Tektonometamorphe Entwicklung von Scherzonen im präkambrischen Basement Südindiens
… evolution of the MSZ, BSZ, PSZ and KSZ. Whole rock data The majority of relic and retrogressed granulites from the MSZ (TDM 2.3–3.1 Ga) and BSZ (TDM 2.6-2.9 Ga) show late Archaean average crustal residence ages. With respect to their LIL-, Nb-depleted tonalitic nature and Nd-model ages, …