Physical conditions during uplift of metamorphic terranes, as recorded by fluid inclusions

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Abstract
The pressure and temperature conditions through which five metamorphic terranes may have passed during uplift have been estimated using the measured compositions and densities of fluids in fluid inclusions, the rupture strength of quartz, and the minimum temperature (~380° C) of CO2-H2O miscibility in natural solutions. The pressures and temperatures of final mineral equilibration are taken as starting points. For four localities, thermal gradients of approximately 27, 33, 54 and 66° C/km existed at some stage during uplift after the rocks had cooled below 380° C. For a fifth locality, a gradient of about 43° C/km existed prior to cooling below 380° C. The P-T path during uplift in four localities was convex towards the temperature axis.

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