【摘 要】
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A garnet-bearing schist from the southernmost such exposure along the Himalaya in east central Nepal records prograde metamorphism at 32.4±0.3 Ma.Phase equilibria modelling,combined with Ti-in-biotite and quartz c-axis thermometry,outline a tight-to-hairp
【机 构】
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Department of Earth,Environmental and Geographic Sciences,University of British Columbia Okanagan,32
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A garnet-bearing schist from the southernmost such exposure along the Himalaya in east central Nepal records prograde metamorphism at 32.4±0.3 Ma.Phase equilibria modelling,combined with Ti-in-biotite and quartz c-axis thermometry,outline a tight-to-hairpin pressure-temperature(P-T)path extending from～515℃and 5.5 kbar to peak conditions at～575℃and 7 kbar followed by deformation during the retrograde phase at 480-515℃and 6-7 kbar.The new geochronology data place an upper bound on the evolution of metamorphism and deformation in the frontal-most part of the Himalaya,which lasted until 17.5 Ma,as indicated by previously published 40Ar/39Ar data.The P-T-time data from this part of the Himalaya,as well as that from more hinterland-ward portions of the orogen,outline a progressive,stepwise,commonly out-of-sequence evolution.Further data from along the orogen indicates that this evolution is not a local phenomenon,but instead characterizes the tectonics of this system as a whole.
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