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Showing 1 to 20 of 21 for “"Whole rock geochemistry"”.
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Geochemistry and petrogenesis of kimberlite intrusions from the eastern lobe the Du Toitspan kimberlite pipe, South Africa
… kimberlite pipe have been analysed for their whole-rock geochemistry and mineral chemistry (olivine and phlogopite) with the aim of developing semi-quantitative models that constrain their petrogenesis and characterise their respective source region(s). Investigated intrusions include; …
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A Targeted Investigation of the Upper Contact Unit of the Sudbury Igneous Complex in the North Range, Sudbury Impact Structure, Canada
… little recognition. Through field observations, whole rock geochemistry, petrography, and electron microprobe analysis, this study concludes that the SIC upper contact is in fact extensive across the North Range of the SIC. Additionally, the geochemistry of the SIC units, offset dykes, and upper …
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Sodium metasomatism and magnesio-riebeckite mineralization in the Wilson Ridge pluton
… involving Na-rich fluids of meteoric origin. Whole-rock geochemistry of samples from zones of hydrothermal amphibole show enrichment of Na2O (>9.6 wt. %) and depletion of K2O (0.15 wt. %) and CaO (2.4 wt. %) relative to unaltered host rock. Secondary fluid inclusions associated with zones of …
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Magmatic evolution of the southern Centinela district, northern Chile: insights from PGE geochemistry and zircon fertility tools
… bodies. Here I present the results of whole-rock geochemistry (including the PGE) and zircon geochronology of the Polo Sur and Penacho Blanco porphyry copper deposits of the southern Centinela District, northern Chile. This project aims to test the hypothesis that the timing of sulfide …
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Magmatic evolution of the southern Centinela district, northern Chile: insights from PGE geochemistry and zircon fertility tools
… bodies. Here I present the results of whole-rock geochemistry (including the PGE) and zircon geochronology of the Polo Sur and Penacho Blanco porphyry copper deposits of the southern Centinela District, northern Chile. This project aims to test the hypothesis that the timing of sulfide …
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Isotopic characterization of bedrock, sediments, and minerals as provenance tools: Examples from an inselberg in the Mojave Desert of SE California
… in provenance signature deviations from source rock to the sediment. Weathering, erosion, mixing, recycling, sorting, diagenesis, and/or lithification can all drive these changes in sediment signatures. </p> <p>In the following chapters, I test both the strengths and limitations of some of the …
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Linking Subsurface Paleofluid Flow Events to Tectonics and Basin Evolution using Geochronology: Examples from the Paradox Basin
… geochemical and physical alterations in the rock record that reflect basin-scale fluid flow systems operating over long timescales. However, paleofluid systems are complex and often leave behind overprinting signatures on the rocks they affect. Understanding the evolution of fluid-rock …
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A study of epigenetic mineralisation in the Central Zone of the Damara Orogen, Namibia with special reference to gold, tungsten, tin and rare earth elements
… geological mapping with petrographic studies, whole rock geochemistry (obtained by X-ray fluorescence spectrometry, atomic absorption spectrometry, fire assay and infra-red spectroscopy), mineral chemistry studies (electron microprobe and X-ray diffraction) and geochronological work (Rb-Sr …
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PETROLOGY, GEOCHEMISTRY, AND AGE OF EXTENSION IN THE LOST TRAIL PASS DIKE SWARM, SOUTHWEST MONTANA
… Eocene. Classifying variations in lithology and geochemistry in these rocks provides insight into the petrogenetic relationships between the rocks in this study and other regional intrusive and extrusive igneous features. Petrographic analysis was used to characterize variations in lithology …
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PETROLOGY, GEOCHEMISTRY, AND AGE OF EXTENSION IN THE LOST TRAIL PASS DIKE SWARM, SOUTHWEST MONTANA
… Eocene. Classifying variations in lithology and geochemistry in these rocks provides insight into the petrogenetic relationships between the rocks in this study and other regional intrusive and extrusive igneous features. Petrographic analysis was used to characterize variations in lithology …
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Lithostratigraphic and Geochemical Characterisation of the Waterberg Coalfield: Implications to Acid Mine Drainage, Limpopo Province, South Africa
… to establish the quality of coal and its host rocks, as well as the potential for acid mine water generation. A total of 18 samples were collected from a box-cut and analysed using various methods such as, Scanning electron microscopy, X-ray diffraction spectroscopy, X-ray fluorescence …
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Petrology and Geochemical Evolution of the East Hill Suite of the Mont Saint-Hilaire Alkaline Plutonic Complex
… distinct nepheline syenites and evolved syenitic rocks. Whole-rock analysis of the East Hill suite reveals two fractionation trends, one which is described by the syenitic lithologies and one by the evolved syenites and syenoids. A lamprophyric unit stands on its own, geochemically, consistent …
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Cooling and crystallization of komatiite flows.
… primary structures, textures, mineralogy, and whole-rock geochemistry to constrain the physical processes of cooling and crystal growth. Seawater convection drove a cooling and fracturing front through the upper surface and was the dominant mechanism of heat loss, leading to pronounced textural …
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Igneous and metamorphic processes in the Shap Granite and its aureole
… during the Lower Devonian (ie 394 Ma) into rocks of Ordovician to Siturian age. It is of adamellite composition and is notable in having megacrysts of orthoclase which crystallised late (relative to the matrix) by an essentially metasomatic process. Late in its cooling history, hydrothermal …
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The geology and geochemistry of the Lumwana Basement hosted copper-cobalt (uranium) deposits, NW Zambia
… analysis, stable isotope analysis (?34S), whole rock geochemistry, and electron microprobe analysis of ore and host rock assemblages. The transitional contacts observed at Lumwana are due to an alteration event associated with mineralization that removed feldspar from ore horizons resulting …
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The stratigraphic and structural controls on copper-gold mineralization at Cassenha hill prospect, within the Archean to Paleoproterozoic Angolan shield, Congo craton, South Western Angola
… and consists of Paleoproterozoic metasedimentary rock sequences which have been intruded by Eburnean granitoids at ± 2.1 Ga. The prospect itself comprises an area of 180 Km2 and has been intermittently explored since 2005 by Rift Valley Resources (RVR) and its associates. The Cassenha Hill …
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The geology of the Khayyam and Stumble-On deposits, Prince of Wales Island, Alaska
… N 70° - 80° W and dip from 70° S to 70° N. Whole rock geochemistry of five samples indicate that the host rocks are metamorphosed, high-sodium low-potassium tholeiitic to calc-alkalic volcanic rocks. Electron microprobe energy dispersive analysis and petrographic observations show that …
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Geochemical characteristics and rare earth element trends of the Upper Zone in the western Bushveld Complex
… nearer to equilibrium than apatite in any other rock units. This lends credence to the theory that an immiscible Fe-P20 5 rich melt forms during the crystallization of the Upper Zone. Various interwoven geochemical twin trends following in stratigraphic sequence, are identified in some cycles and …
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The igneous petrology, thermal history, and genesis of sedimentary rock-hosted Au deposits in the northern Battle Mountain mining district, Nevada
… disseminated deposits, as well as sedimentary-rock hosted Au deposits of uncertain origin. This dissertation examines the ages of magmatism and mineralization in the Battle Mountain mining district, the characteristics of hypogene sedimentary rock-hosted Au mineralization at the deposit scale, …
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Diagenetic, thermal and provenance histories of the Permian lower Ecca Group based on two newly drilled boreholes in the western and eastern main Karoo Basin, South Africa
Fine-grained sedimentary rocks of the Lower Permian lower Ecca Group in the Main Karoo Basin (MKB) in southern Africa have been identified to form a possible unconventional hydrocarbon reservoir, the gas potential of which is still relatively unknown. The lower Ecca Group is comprised of …
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