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 36 for “"Geochemical studies"”.
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Geochemical studies of earth materials
… in inclusions do not dissolve during heating studies of "as collected" quartz vein material. However, after the samples were held at an elevated (but unknown) hydrogen pressure in a cold-seal-type pressure vessel at 600°C and 2.5 kbars for seven days, chalcopyrite daughter crystals dissolve …
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Experimental and geochemical studies of terrestrial and lunar magmatic process
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Petrological and geochemical studies of an abyssal periodotite from the Atlantis II fracture zone
… requirement to create and to preserve such geochemical signature.
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Structural, stratigraphic and geochemical studies of the Horwood Peninsula - Gander Bay Area, Northeast Newfoundland /
The Horwood Peninsula - Gander Bay area is located at NE Newfoundland in the Botwood Zone (Williams et a1., 1974) or in the Dunnage Zone (Williams, 1979) of the Central Mobile Belt of the Newfoundland Appalachians. The area is underlain by Middle Ordovician to possible Lower Silurian rocks of the …
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Petrological and geochemical studies of an abyssal periodotite from the Atlantis II fracture zone
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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High-resolution geochemical studies on the most recently-accumulated sapropel S1 in the eastern Mediterranean
… record. This research presents a high-resolution geochemical investigation on slowly- and rapidly-accumulated SI units.Mn, Fe, I and Se profiles in slowly-accumulated SI units (5-10 cm/kyr) have shown that these sapropels are affected by post-depositional oxidation following their formation which …
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Constraints on the petrogenesis of lavas from large plumes : inferences from geochemical studies of lavas from Mauna Kea, Hawaii, and Mt. Bureau, Kerguelen archipelago
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Geochemical studies on antimony: antimony dispersion in water draining Su Suergiu mine area; removal of Sb(V) from aqueous solution by layered double hydroxides (LDH)
… (Leuz et al., 2006). In this work the hydrogeochemical behavior of Sb has been studied in water draining the abandoned antimony mine of Su Suergiu, SE Sardinia. Waters flowing at Su Suergiu show high Sb concentration and impact the main river of South Sardinia, the Flumendosa River that …
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Evaluating mantle and crustal processes using isotope geochemistry
Geochemical studies are fundamental for understanding how the dynamic Earth works and evolves. These studies place constraints on the composition, formation, age, distribution, evolution and scales of geochemically distinct reservoirs such as the Earth's crust, mantle and core. In this dissertation …
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Sedimentological and geochemical evidence for late quaternary environmental changes in southern Africa : a case study of the mudbelt deposits off Namaqualand
This thesis is comprised of sedimentological and geochemical studies of seven 7m core sediments retrieved from the Namaqualand Mudbelt, South Africa. The purpose of this research is to contribute to the evidence for environmental change during the late Quaternary in the southern Africa from the …
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The geologic and tectonic evolution of the Pan-African/Mozambique Belt in East Africa
… has been documented using Landsat, field and geochemical studies. This has led to the recognition of five ophiolite belts. These ophiolite belts represent sutures marking the position of island arcs and could be traced to Saudi Arabia on a pre-Red Sea drift reconstruction. Most of the …
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Speleogenesis of Critchfield Bat Caves and Associated Hydrogeology of the Northern Edwards Aquifer, Williamson County, Texas
… area. </p> <p>Karst, stratigraphic, GIS, and geochemical studies were conducted to evaluate development of karst and hydrogeology in the Salado Creek Watershed. GIS analyses included interpretations of digital elevation models derived from LiDAR data of the study area. Karst features found in …
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Intraplate Volcanism in our Solar System; Searching for Terrestrial Analogues for the Moon and Mars
… (particularly for Mars), however, has meant geochemical studies comparing these basalts to Earth have been limited. In this study, petrological and geochemical data for Lunar (basaltic breccias) and Martian (lherzolitic and olivine-phyric Shergottites) meteorites were obtained using …
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Metamorphism of the Troodos Massif, Cyprus
… the compositions of the Troodos magmas. Even so, geochemical studies alone are incapable of defining the tectonic environment in which the Trooclos massif was generated, but coupled with other geological evidence, a petrogenetic model has been formulated in which the whole massif is seen to have …
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Geology and petrogenesis of the Tuscarora Intrusion of the Duluth Complex, Gillis Lake 7.5’ quadrangle, northeastern Minnesota
… (1:12,000) and follow-up petrographic and geochemical analyses were conducted to evaluate the troctolitic igneous stratigraphy of the Tuscarora Intrusion, as well as to understand the petrologic relationship between the troctolitic cumulates and the plagioclase-rich gabbros of the overlying …
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Reduce the charge risking applying migration tracers
… the pre-drill assumptions. Geological and geochemical studies are made to identify, understand and reduce the pre-drill risk of a well. In the Norwegian North Sea, the charge risk became the most important risk, as charge failure accounts for the main reason of being a dry well for post …
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Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia
… through detailed field, petrological, and geochemical studies of the Dariv Igneous Complex in Western Mongolia. The Dariv Igneous Complex records the crystallization of a high-K primitive arc melt at shallow crustal levels, preserving both biotite-bearing ultramafic and mafic cumulates, as …
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Geology and Geochemistry of Muyexe Magnesite Deposit, Giyani Greenstone Belt, Limpopo Province, South Africa
… magnesite and rock sampling for petrographic and geochemical studies using petrographic microscopy and X-ray fluorescence spectrometry and identification of minerals in rocks and magnesite through X-ray diffractometry. A total of 20 magnesite and 4 host rock samples were collected from the Muyexe …
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Tannin geochemistry of natural systems: method development and application
… analysis, a survey of source tissues, and a geochemical application focussed on mangrove leaf diagenesis in a tropical estuary.The developed method consists of acid hydrolysis (HCl) of samples in acetone, water, and phloroglucinol as a nucleophile for carbocation capture. Analytes are …
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Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia
… through detailed field, petrological, and geochemical studies of the Dariv Igneous Complex in Western Mongolia. The Dariv Igneous Complex records the crystallization of a high-K primitive arc melt at shallow crustal levels, preserving both biotite-bearing ultramafic and mafic cumulates, as …
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