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Diagenetic palaeotemperatures from aqueous fluid inclusions: re-equilibration of inclusions in carbonate cements by burial heating

Published online by Cambridge University Press:  05 July 2018

R. C. Burruss
R. C. Burruss*
Affiliation:
US Geological Survey, Box 25046, MS 921, Denver, Colorado 80225, USA
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Abstract

Diagenetic palaeotemperatures determined from aqueous fluid inclusions can be affected by re-equilibration during burial heating. Calculations based on the observed behaviour of inclusions in fluorite under external confining pressure allows prediction of the temperatures and depths of burial necessary to initiate re-equilibration of aqueous inclusions in the common size range 40 to 4 µm. Heating of 20° to 60°C over the initial trapping temperature may cause errors of 10° to 20°C in the homogenization temperature. This suggests re-equilibration may cause aqueous inclusions in carbonates to yield a poor record of their low-temperature history, but a useful record of the maximum temperature experienced by the host rock. Previous work suggests inclusions containing petroleum fluids will be less susceptible to re-equilibration.

Keywords

palaeotemperaturesfluid inclusionscarbonatesfluorite
Type
Mineralogy and petroleum genesis
Information
Mineralogical Magazine , Volume 51 , Issue 362 , October 1987 , pp. 477 - 481
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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