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 9 of 9 for “"ID-TIMS"”.
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High-Precision ID-TIMS U-Pb Zircon Geochronology of Three Cenomanian Bentonites from the Western Canada Foreland Basin
… The X, A-X and Bighorn River bentonites provide important calibration points for the Cenomanian Stage. Single zircon crystals from these bentonites were chemically-abraded and dated using high-precision U-Pb ID-TIMS geochronology techniques. The Pb/ U weighted-mean ages are: 95.87±0.10 Ma for …
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Temporal and petrological constraints of ultrahigh-pressure metamorphism and exhumation of crustal material from mantle depths to Earth's surface: Insights from a large and small ultrahigh-pressure terrane
… at least twenty terranes have been described and identified by the preservation of UHP minerals (i.e., coesite and diamond) mainly within eclogite. These terranes fall into two broad categories: 1) large (30,000 km2) coherent terranes characterized by slow (>20 Myr) subduction-exhumation …
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Processes and rates of arc crust growth and differentiation in the Southern Sierra Nevada crustal section
This thesis presents a multidisciplinary investigation of the processes and timescales for the construction of arc crust, with a focus on the exposed crustal section in the southernmost Sierra Nevada Batholith, California. This section exposes plutons that were emplaced at pressures ranging from …
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High precision U/Pb geochronology on the Cenomanian Dakota Formation, Utah : implications for paleobotany and the transgression of the Western Interior Seaway preceding Oceanic Anoxic Event 2
… dilution thermal ionization mass spectrometry (ID-TIMS). The samples collected from the Westwater, Utah localities have a weighted mean 206Pb/238U date of 97.656±0.082 Ma, while the samples taken from Henrieville, Utah have weighted mean 206Pb/238U dates of 95.170 0.056 Ma and 94.941±0.032 Ma. …
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A thermotectonic framework for the growth and stabilization of the eastern Kaapvaal craton, southern Africa
… km2 of eastern S. Africa and Swaziland, and provide a record of the continental assembly and subsequent stabilization of the eastern Kaapvaal craton. This thesis uses structural, geochronological, thermochronological and isotopic constraints to examine the tectonothermal processes responsible for …
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Structural study of the auriferous Santoy shear zone, northeastern Glennie domain, Saskatchewan
… studied using a structural and geochronological (ID-TIMS) approach in order to decipher its complex relationship with plutonism, deformation, alteration, and gold mineralization. Surface and subsurface mapping reveals that the Santoy shear zone, and deposits therein, show a clear structural …
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Geology of the Archean Côté Gold Au(-Cu) intrusion-related deposit, Swayze Greenstone Belt, Ontario
… of the host rocks and high-precision UPb ID-TIMS zircon geochronology results constrain the CIC to ca. 2741 to 2739 Ma. Although a close temporal relationship exists between the tonalite and dioritic phases, they appear to be petrogenetically unrelated. The CIC is demonstrated to be …
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Evolución y geocronología de alta precisión de la actividad magmática e hidrotermal en los depósitos tipo pórfido de Cu-(Au-Mo) del proyecto Altar, San Juan, Argentina
… un conjunto de centros mineralizados tipo pórfido de cobre, agrupados en las áreas de Altar, Quebrada de la Mina (QDM) y Altar Norte. La mineralización está asociada a stocks y diques porfíricos de edad Mioceno medio-tardío (Suite Subvolcánica Superior), hospedados en unidades volcánicas del …
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Use of stable isotopes to assess phytoremediation of soils contaminated with cadmium and zinc.
… soil with uncontaminated soil, extraction with acids or chelates) whilst others provide only short term solutions (e. g. reduction of metal bioavailability by liming or adding organic matter). An alternative approach is the use of hyperaccumulator plants to remove the heavy metals. …