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 10 of 10 for “"U-Pb Zircon Geochronology"”.
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High-Precision ID-TIMS U-Pb Zircon Geochronology of Three Cenomanian Bentonites from the Western Canada Foreland Basin
… 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 the X-bentonite, 95.67±0.15 Ma for the A-X bentonite, and …
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Processes and rates of arc crust growth and differentiation in the Southern Sierra Nevada crustal section
… BVIS. Chapter 2 is a high-precision CA-ID-TIMS U/Pb zircon geochronology study of the BVIS.
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A thermotectonic framework for the growth and stabilization of the eastern Kaapvaal craton, southern Africa
… plutons, and in combination with ID-TIMS U-Pb zircon geochronology and Sm-Nd analysis, places sub-Myr constraints on the timing, distribution, and kinematics of magmatism and deformation during growth and modification of continental lithosphere. Detailed U-Pb apatite and titanite …
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A lower crustal perspective on the stabilization and reactivation of continental lithosphere in the western Canadian shield
… processes from formation to exhumation. U-Pb zircon geochronology documents two episodes of metamorphic zircon growth at 2.55 Ga and 1.9 Ga, linked with two high-pressure granulite facies assemblages preserved in Chipman domain mafic granulites. The intervening 650 m.y. of relative …
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High-resolution temporal records of magmatism, sedimentation, and faulting at evolving plate boundaries
This dissertation uses high-precision U-Pb zircon geochronology to document the spatial and temporal distribution of magmatism, deformation, and sedimentation during Paleogene ridge-trench interaction in western Washington. Chapter 1 creates a regional stratigraphy for nonmarine sedimentary and …
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Genesis and structure of the San Albino orogenic gold deposit, NW Nicaragua with implications for Mesozoic tectonic and metallogenic processes
… analysis of structural orientations, and U-Pb zircon geochronology of dike samples. Drill core logging and open pit mapping provided key observational constraints, helping to delineate pre- to syn-mineralization structure, such as isoclinal folds and mylonitic textures in schistose host …
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The tectonic evolution of the Southern Granulite Terrane of India and its role in the amalgamation of Gondwana.
… alternatively, the Cauvery Shear Zone). The U-Pb zircon geochronology of the orthopyroxene-bearing orthogneisses (charnockites) in the northern part of Madurai Block yielded Neoarchaean and Cryogenian (ca.2.7 - 2.5 Ga and 795 ± 17 Ma) crystallization ages with metamorphic overprinting at ca. …
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Petrogenesis of Mesoarchean high-K rocks in the Kaapvaal Craton: Investigating the Boesmanskop Alkaline Complex and Salisbury Kop batholith
… chemistry, whole-rock compositions, and U-Pb zircon geochronology, alongside Rb-Sr and Sm-Nd isotopic data and phase equilibrium modeling for the BAC rocks. The BAC includes coarse-grained syenite, quartz monzonite and leucogranite. Some syenites display porphyritic textures that indicate …
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The thermal structure of collisional orogens – insights from the Grenville orogen in Canada and Scotland
… equilibrium modelling, age constraints from U-Pb zircon and monazite geochronology, structural observations and measurements, and regional geological and geophysical datasets. My research focuses on two study regions: (1) the eclogite-facies Glenelg inlier in northwest Scotland, and (2) a 130 …
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Geochemical and Geochronological Constraints on the Origin and Evolution of Rocks in the Active Woodlark Rift of Papua New Guinea
… v. 309, p. 56 - 66), is entitled `Lu-Hf garnet geochronology applied to plate boundary zones: Insights from the (U)HP terrane exhumed within the Woodlark Rift'. This chapter focuses on the use of the Lu-Hf isotopic system to date garnets in the Woodlark Rift. Major findings of this study are …