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.
Results
Showing 1 to 20 of 22 for “"geothermometry"”.
-
Aluminum substitution in quartz, a study in geothermometry
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1963.
-
Petrographic, Fluid Inclusion, and Illite Geothermometry Analysis of the Rumpel Lake Drill Core, Athabasca Basin, Northern Saskatchewan, Canada
The Athabasca Basin in northern Saskatchewan contains some of the world’s highest-grade unconformity-related uranium deposits, the genesis of which has been extensively explored in the literature. Constraints on the temperature, pressure, and composition of diagenetic fluids within the Athabasca …
-
Recent two-feldspar, Ti-in-biotite, and garnet-biotite geothermometry of the Frontenac terrane and Adirondack Lowlands, Grenville Province, Canada and the United States
… garnet-biotite, Ti-in-biotite, and two-feldspar geothermometry and we examined the geochemistry of Adirondack Lowlands and Frontenac terrane pelites. Rare-earth elements and trace element concentrations reveal a shale protolith for the Adirondack Lowlands pelites and most likely for the Frontenac …
-
Detailed Analysis of Geothermal Potential in Crescent Valley, North-Central Nevada
… 87°C hot spring actively depositing sinter and geothermometry greater than 170°C (possibly >180°C). Future exploration efforts at Hand-Me-Down Creek would benefit from focusing on targeting high permeability zones at depth utilizing densely spaced electromagnetic surveys, fluid flow modeling, …
-
Thermal History of the Chesapeake Bay Impact Crater
… to be approximately 1.6 km below sea level. Geothermometry and advective and conductive heat flow modeling was performed to characterize a possible post-impact hydrothermal system. Thermal maturity and radiogenic techniques were used to estimate the temperature history of the crater …
-
The geological record of oceanic crustal accretion and tectonism at slow-spreading ridges
… were analyzed by study of microstructure and geothermometry of abyssal peridotite mylonites recovered from fault zones at slow-spreading ridges.
-
A metamorphic and geochemical study of mafic rocks across the Pencksökket-Jutulstraumen Discontinuity, western Dronning Maud Land, East Antarctica
… of phase equilibria together with chlorite geothermometry. The high-grade P-T constraint for the westernmost part of the Maud Belt closest to the glacier, derived from hornblende-plagioclase thermometry and geobarometric calculations with a garnet amphibolite assemblage, is very similar to …
-
Variable water pressure metamorphic assemblages in the Meguma Group, Nova Scotia
… d+Grt+Bt+Q+Pl+Ms+Ilm+Mgt±St±Crd±Sil±Po±Py. Grt-Bt geothermometry and Pl-Grt-And-Q geobarometry on samples from three widely separated 3-8 km traverses yield temperatures and pressures that cluster in two groups; (1) two traverses near Shelburne with T=500-510°C and P=3.5 kbar; and (2) one traverse …
-
A comparison of the Nickel and the conventional geothermometers with respect to the Jagersfontein and the Matsoku kimberlite peridotite xenolits
… used in temperature determination by Ni geothermometry. Thus, Ni compositions of garnets determined by PIXE, LA-ICP-MS and SIMS were compared to select the most 'reliable' dataset. Four matrix-matched secondary garnet standards were developed for the cross-checking and testing of the …
-
The geochemistry of fluid processes in the eastern branch of the East African Rift System
… origin, movement and evolution, and (iii) fluid geothermometry. Within this context some specific aims have been pursued. The strong possibility of longdistance axial flows of groundwater has been shown by use of stable isotopic techniques. Further insights into alkaline hydrological discharge …
-
The Geochemistry of Silica in Icelandic Geothermal Systems
… with quartz are often most important. Geothermal geothermometry relies on the assumption of such fluid-mineral equilibria, that are in turn primarily dependent on the temperature at geothermal conditions. It follows, that equilibrium of the fluids with many silica containing geothermal minerals …
-
Petrology and Geochemical Evolution of the East Hill Suite of the Mont Saint-Hilaire Alkaline Plutonic Complex
… fugacity data combined with petrography and geothermometry defined an 2 fO – T curve for the East Hill suite magma, revealing that the oxygen fugacity ranged between approximately 10-10 bar at intrusion down to 10-25 bar subsolidus, and that, owing to non-linearity of oxygen buffers, the 2 fO …
-
Geothermal reservoir characterisation using automated mineralogy; implications for CO2 sequestration
… such as identification of minerals used in geothermometry, as well as any possible benefits in understanding CO2and H2S sequestration projects. 209 cutting samples were analysed using SEM-EDS and processed using AMICS software at 10m intervals through the NJ-18 well, producing quantitative …
-
Characterization of Fluids Associated with Vein-type Uranium Mineralization in the Beaverlodge Uranium District, Northern Saskatchewan: Field, Petrographic, Fluid Inclusion and C-O Isotope Studies
… temperature (238.3oC) obtained from chlorite geothermometry. Mass spectrometric analysis of bulk fluid inclusions shows the volatiles are dominated by H2O, with minor amounts of CO2, CH4, H2, O2, N2, Ar and He. On plots of Ar/He versus N2/Ar, the data overlap the fields of basinal brines and …
-
Petrologic, geochemical and isotopic evolution of rhyolite lavas from the Okataina, Rotorua and Kapenga Volcanic Centres, Taupo Volcanic Zone, New Zealand
… Temperatures determined from Fe-Ti oxide geothermometry range from ∼ 650 - 830°C. The lavas are dominantly peraluminous, medium-K, calc-alkaline rhyolites, with SiO₂ ≈ 72.5 - 77.5 wt. %, ⁸⁷Sr/⁸⁶Sr ≈ 0.70516 - 0.70583, εNd ≈ 0.02 - 1.70, ²⁰⁶Pb/²⁰⁴Pb ≈ 18.75 - 18.84, ²⁰⁷Pb/²⁰⁴Pb ≈ 15.55 - …
-
Modification of magnetic properties in granite during hydrothermal alteration (EPS-1 borehole, Upper Rhine Graben)
… at temperatures ~300 °C, obtained from chlorite-geothermometry. The formation of permeable zones allowed the circulation of O2-rich fluids, which caused the oxidation of magnetite into martite (hematite) within discrete zones. Granites, which are situated further away from a fault zone remained …
-
A detailed investigation into diamond-bearing xenoliths from Newlands Kimberlite, South Africa
… (depending on the classification scheme used). Geothermometry yields temperatures between 920 to 1080 °C, equivalent to pressures between 42 and 58 kbar (based on a 37-38 mW/m 2 geotherm), which lies within the diamond stability field. Re-Os systematics for the diamond-bearing eclogites are …
-
Theory and Utility of the Three Isotope Fractionation Relationship
… began with the study of oxygen isotope geothermometry, most famously for carbonates. Traditionally oxygen isotope studies are only concerned with the relationship between one rare isotope, oxygen-18, and the common isotope, oxygen-16. In these cases, the abundance of the third stable …
-
Investigation of the Geology, Structural Setting and Mineralisation the Copper-Sulphide Deposits in the Messina Area, Limpopo Mobile Belt, South Africa
… mineralogy and ore microscopy, fluid inclusion geothermometry and isotope geochemistry. The work was done in different laboratories including: Mining and Environmental Geology Laboratory, Unviersity of Venda; Department of Geology Laboratory, University of Johannesburg; MINTEK Laboratory in …
Page 1 of 2