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Evolution of a two billion year subduction zone: Insights from the integration of microstructure and geochronology. The dynamic evolution of the earth is fundamentally linked to its thermal history. Since, the internal heat production of the earth has changed over time, plate tectonic processes may also have changed over earth history. The manner and timing of this change is highly controversial. We aim to address the nature of tectonic processes 2 billion years ago by studying one of the wor ....Evolution of a two billion year subduction zone: Insights from the integration of microstructure and geochronology. The dynamic evolution of the earth is fundamentally linked to its thermal history. Since, the internal heat production of the earth has changed over time, plate tectonic processes may also have changed over earth history. The manner and timing of this change is highly controversial. We aim to address the nature of tectonic processes 2 billion years ago by studying one of the world's oldest subduction zones (the Usagarian belt in Tanzania). The geometry, kinematics and deformation history of the subduction complex will be integrated with radiometric age dating to quantify the style and rates of ancient tectonic processes.Read moreRead less
Accessory Mineral Microstructure and Implications for Geochronology. U-Pb geochronology of accessory minerals is widely used to constrain the timing of igneous, metamorphic and sedimentary processes. However, our current knowledge of isotope mobility in these important minerals cannot readily explain some common features of U-Pb dating. Using new developments in quantitative microstructural analysis integrated with high spatial resolution geochronology we will constrain the relationship between ....Accessory Mineral Microstructure and Implications for Geochronology. U-Pb geochronology of accessory minerals is widely used to constrain the timing of igneous, metamorphic and sedimentary processes. However, our current knowledge of isotope mobility in these important minerals cannot readily explain some common features of U-Pb dating. Using new developments in quantitative microstructural analysis integrated with high spatial resolution geochronology we will constrain the relationship between accessory minerals deformation and its effect on radiometric ages. Our results will lead to a better understanding of geochemical modification of accessory minerals and may lead to the development of new applications of geochronology and improve the dating of rock deformation.Read moreRead less