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The evolution of the continental crust from the Paleoarchean has been punctuated by several episodes of supercontinent assembly and breakup. Since then, the tectonic processes witnessed a transition from a stagnant lid regime to a plate tectonic regime. But how can we study this evolution?
It is important to note that the thermal and burial history of the crust is beautifully preserved in the metamorphic rock record. Metamorphic rocks (especially HT-UHT rocks) formed in different tectonic settings record distinct evidence of change in pressure (P) and temperature (T) with time (t) commonly expressed as P-T-t paths.
Our studies aim to reconstruct the P-T paths of HT-UHT rocks by integrating field-based observations, mineral assemblages and their compositions and thermodynamic modelling to determine the tectonic setting in which these rocks formed. Further we utilize geochronology to determine (1) the age(s) of orogeneses and (2) the duration of events, to related them with global supercontinent cycles. In summary, we study the evolution of Precambrian crust through one or multiple supercontinent cycles in different orogenic belts.
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