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Experimental decrepitation and re-equilibration of fluid inclusions in synthetic quartz



Experimental decrepitation and re-equilibration of fluid inclusions in synthetic quartz



Tectonophysics 78(1-4): 567-583



Strong discrepancies between densities of the fluids trapped in fluid inclusions (F.I.) and P-Tp couples deduced from other geological considerations are common. So, it was decided to test experimentally the possible F.I. re-equilibrations when bringing the host crystal in P-Tp conditions, different from trapping conditions. Runs were conducted on synthetic quartz in a gas apparatus and in a Griggs solid medium apparatus. The following modifications of the F.I. were observed: 1.(1) drastic shape changes of the primary F.I., and appearance of clusters or trails of small secondary inclusions sometimes related to a crack2.(2) lowering of the fluid densities. Such a re-equilibration is a decrepitation phenomenon: first, hydraulic fracturing, then sealing of the cracks with appearance of secondary inclusions. When using the gas apparatus, the new measured densities are in very good accordance with the nominal P-Tp conditions. When using the solid-medium apparatus, the new densities are surprisingly low relative to the nominal P-T conditions, probably due to a strongly anisotropic stress state in the apparatus.

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Accession: 018890696

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DOI: 10.1016/0040-1951(81)90029-9


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