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Showing 1 to 9 of 9 for “"monazite geochronology"”.
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New structural interpretation, microstructural analyses, and preliminary monazite geochronology of Proterozoic rocks in the central Manzano Mountains, New Mexico
… event. Geochronologic studies of metamorphic monazite grains will place time constraints on when movement occurred within the area. Metamorphic monazite grown during tectonic deformation can have incremental growth patterns such as rim and core features. The ability to relate grain orientation …
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Testing the driving mechanisms for exhumation of the Greater Himalayan zone in eastern Bhutan: Implications of split-stream zircon and monazite geochronology
… and lower (GHZl) structural levels, zircon and monazite from twenty samples from the Lesser Himalayan zone (LHZ) and the GHZ were analyzed for U–Th–Pb isotopes and trace-element abundances using split-stream laser-ablation inductively coupled plasma mass spectrometry (LA-ICPMS). …
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Monazite Geochronology of the Madison Mylonite Zone and Environs, Southwestern Montana: With Implications for Precambrian Thermotectonic Evolution of the Northern Wyoming Province
… is preserved in metamorphic zircon rims and monazite growth throughout the Snowy shear zone (SSZ) and the Madison mylonite zone (MMZ), South Madison Range, Montana. Comparison of U-Pb and U-Th-Pb ages yielded by monazite grains from both shear zones and zircon rims from SSZ, a new timing for …
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Garnet-biotite thermometry, garnet-aluminum silicate-silica-plagioclase barometry, and Emp monazite geochronology of the early Proterozoic Ivanpah Mountains, eastern Mojave Desert, Se California
… garnet studied; Electron Microprobe Analysis on monazite, using U-Th-Pb radioactive decay, suggest metamorphism occurred between 1752 +/- 86 Ma and 1689 +/- 34 Ma, similar to the age of the Yavapai terrane (∼1.70--1.69 Ma). These ages are constrained from six monazite grains included in three …
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The thermal structure of collisional orogens – insights from the Grenville orogen in Canada and Scotland
… 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 km …
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Investigation of the monazite chemical dating technique
… microprobe (EMP) method for chemical dating of monazite, we chemically analyzed selected suites of monazite grains that were previously dated by standard U/Pb isotopic methods at three laboratories each equipped with a sensitive high resolution ion microprobe (SHRIMP). Representing diverse …
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Investigating the metamorphic evolution of reworked terrains.
This project is an integrated monazite and zircon LA-ICPMS geochronology and metamorphic phase equilibria study of regions which have experienced multiple metamorphic events. The aim of using this combination of techniques is to construct P-T-t evolution histories of both older and younger …
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The thermal and metamorphic evolution of the Northern Highlands Terrane, Scotland
… controlling convergent tectonics. I have used monazite-xenotime thermometry and geochronology, in conjunction with metamorphic petrology and additional accessory phase geochronology, to place constraints on the timing and rates of thermal metamorphism in a variety of structural settings …
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Tectonic Transport Directions and Timing of Metamorphism in the southern part of the Northern Highlands Terrane, Scotland
… U-Pb isotopic ages collected from titanite, monazite, and xenotime indicate that mineral growth occurred during the Knoydartian - late Neoproterozoic (765-638 Ma), the Grampian II (460–437 Ma), and late/post-Scandian events (418–412 Ma). Some of the older Caledonian (Grampian-Scandian) ages …