Origin of retrograde fluids in metamorphic rocks
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Keywords:
Hydrostatic pressure
Fluid pressure
Basement
Hydrostatic equilibrium
Fluid inclusions in clearly defined fluid inclusion assemblages (FIAs) from various geologic environments were examined to assess the uncertainty associated with determining the temperature of a fluid event based on fluid inclusion homogenization temperatures (Th). A fluid event is defined as a physical or chemical process such as the healing of a microfracture or the formation of a growth zone in a crystal that occurs in the presence of a fluid phase and results in trapping of fluid inclusions to form an FIA. Examination of data from a large number of fluid events collected within a rigorous temporal and spatial (paragenetic) framework forms the basis for developing a complete fluid pressure-temperature-composition (PTX) history.
Homogenization
Fluid pressure
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Fluid inclusions tend to objectively record the fluid conditions during the metamorphism and subsequent tectonism. The temperatures and pressures for the fluid inclusion formation are believed to be the significant factors indicating physical and chemical conditions during the fluid inclusion formation. The morphology and compositions of the fluid inclusions from the Xuelongshan ductile shear zone, Yunnan examined in this paper may reflect the genesis, nature and evolution of the fluids from this area. The results of research show that the Xuelongshan ductile shear zone is not only a tectonically deformed zone but also a catathermal and retrogressive metamorphic zone.
Fluid pressure
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Fluid pressure
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