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 20 of 51 for “"Geochemical characteristics"”.
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Geology, petrology and geochemical characteristics of alteration zones within the Seridune prospect, Kerman, Iran
… the barren intergranular quartz monzonite rocks. Geochemically, the Al2O3/(CaO + Na2O + K2O) ratio (0.90 to 0.93) and the Na2O content (> 4.44 wt.%) classify the Seridune granodiorite porphyries into weakly crustal contaminated I type granitoid. The total Al (AlT) content of biotite (2.49 apfu) …
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Geochemical characteristics and rare earth element trends of the Upper Zone in the western Bushveld Complex
The geochemical trends of the Bierkraal 1 drill core are investigated to document fractionated magma, 2) convectional overturning resulting from the disintegration of a stagnant layer, or 3) whether prestratification of the magma in the magma chamber existed. Rare earth element distribution …
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Groundwater geochemical characteristics and its suitability for drinking and irrigation in Ventersdrop, North West Province, South Africa
Groundwater is major source of freshwater in regions devoid of surface water resources. The dependence on groundwater is increasing worldwide. South Africa is no exception. Groundwater resource has been identified as the main and reliable water resource for human consumption and agricultural …
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Geochemical characteristics and microbial diversity of CO2-rich mound springs of the Tierra Amarilla anticline, New Mexico
… the water geochemistry, microbial heterogeneity, geochemical cycling, and paleohydrological longevity of a unique set of desert springs in north-central New Mexico. This series of travertine-depositing CO2-rich springs is located along the boundary zone between the Colorado Plateau and Rio Grande …
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Legacy soil contamination by crude oil from the First Gulf War : geochemical characteristics, spatial pattern and environmental risk
… this PhD study was to obtain insights into the geochemical characteristics of the aged contaminated soils and, using this knowledge, to develop 3-D predictive models for spatial distribution of the contaminated soils and remediation strategies based on site-specific environmental risk …
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Investigation of the temporal and geochemical characteristics, and the petrogenetic origins of the Spanish Peaks intrusive rocks of south-central Colorado, An
Includes bibliographical references (pages 152-165).
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Investigation of the temporal and geochemical characteristics, and the petrogenetic origins of the Spanish Peaks intrusive rocks of south-central Colorado, An
Includes bibliographical references (pages 152-165).
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Development and application of field methods for determination of the extent of acid mine drainage contamination and geochemical characteristics of stream sediment recovery
Metal-mining processes can negatively affect surface and ground waters through the generation of acidic mine drainage (AMD). Introduced metals typically are deposited from the water column onto the stream bed downstream of the AMD input(s). The drivers of metal deposition onto stream sediments are …
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Geochemical heterogeneity in the Hawaiian plume : constraints from Hawaiian volcanoes and Emperor seamounts
… role in the plume hypothesis. In this research, geochemical data on the Hawaiian-Emperor lavas are used to evaluate the plume hypothesis. There are important geochemical similarities among lavas from the Hawaii-Emperor Chain, such as high Ba/Th (>100), high ³He/⁴He (>10 R/R-A) and enrichment in …
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A Chemical and Isotopic Investigation of the Groundwater in the Mahomet Bedrock Valley Aquifer: Age, Recharge and Geochemical Evolution of the Groundwater
… in a conceptual model explaining the variable geochemical characteristics across the MA. The 14C data indicates that the MA is well protected from surficial contamination.
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White River Group diagenesis
The geochemical characteristics of paleofluids in the White River Group played a vital role in controlling zeolitic alteration as well as the formation of calcretes. The White River Group is a terrestrially deposited sequence of mid-Tertiary age in the northern Rocky Mountains and Great Plains of …
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A geochemical study of diamonds, diamond inclusion minerals and other mantle minerals from the Klipspringer kimberlites, South Africa
… at 148+-4 Ma and the current study presents the geochemical characteristics of their diamonds, diamond inclusion and mantle macrocrysts/bimineralic nodules. The Klipspringer lithosphere is dominated by eclogite and Iherzolite with harzburgite and dunite present to a lesser extent.
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Petrogenetic and Geochemical characterization of the Spinghar Crystalline Complex in North-Western Pakistan
… leucogranites (LG). Integrated petrographic and geochemical investigation from the granitoids reveal their calc-alkaline, peraluminous (A/CNK > 1) and S-type character. The high precision U-Pb zircon mean ages of 2349 ± 7.3 Ma for GG and 1831 ± 19 Ma for LG show their emplacement in Early …
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Geochemically tracing the intermediate and surface waters in the Tasman Sea, southwest Pacific
… Pacific over space and time. Initially, by using geochemical tracers to look at the present distribution, sources and mixing of the water masses. Secondly, by using oxygen and carbon isotopes from sediment cores to study changes in Antarctic Intermediate Waters (AAIW) over the late Quaternary in …
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Geochemically tracing the intermediate and surface waters in the Tasman Sea, southwest Pacific
… Pacific over space and time. Initially, by using geochemical tracers to look at the present distribution, sources and mixing of the water masses. Secondly, by using oxygen and carbon isotopes from sediment cores to study changes in Antarctic Intermediate Waters (AAIW) over the late Quaternary in …
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The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments
… of the impoundments and analysed for salient geochemical characteristics, such as major and trace element concentrations, clay mineralogy, organic carbon, P fractionation, and particle size distribution. Batch experiments were also carried out to determine the P sorption desorption …
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Origin of geochemical heterogeneity in the mantle : constraints from volcanism associated with Hawaiian and Kerguelen mantle plumes
… compositions and the processes that created the geochemical heterogeneity within the mantle. Kerguelen and Hawaii are two long-lived mantle plumes and lavas associated with them have very different geochemical characteristics. In this thesis I studied the geochemical compositions of the lavas …
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Analysis of Hydrologic and Geochemical Time Series Data at James Cave, Virginia: Implications for Epikarst Influence on Recharge
… a critical zone as it can control hydrologic and geochemical characteristics of recharge to the underlying karst aquifer. The overall goal of this thesis is to utilize time series hydrologic and geochemical data collected at James Cave, Virginia, to examine the influence of epikarst on the …
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Geologic evolution of the Archean Buhwa Greenstone Belt and surrounding granite-gneiss terrane, southcentral Zimbabwe
… contains a thick succession of iron-formation. Geochemical characteristics of the shales indicate that the source terrane consisted of several lithologies including tonalite, mafic-ultramafic volcanic rocks, and granite that underwent intense chemical weathering. Basinal deposits consist …
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