Transport of Pb and Sr in leaky aquifers of the Bufa del Diente contact metamorphic aureole, north-east Mexico

Article Abstract:

The Sr and Pb isotopes from the 31.6+/-0.3 Ma old Diente del Bufa alkali syenite, northeastern Mexico, and marbles of its contact aureole were employed to determine the sources and the mobility of these metals during hydrothermal activity. Findings showed that U was transported with the magmatic fluid along the aquifer and that during unmixing of the highly saline magmatic fluid U fractionated into the CO2-rich H2O-CO2 fluid from which it precipitated selectively in the meta-argillite band across the aquifer.

Aquifers

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Contrasting fluid flow patterns at the Bufa del Diente contact metamorphic aureole, north-east Mexico: evidence from stable isotopes

Article Abstract:

Magmatic fluid infiltration at the syenite/massive marble contact at the metamorphic aureole of the Bufa del Diente alkali syenite in northeastern Mexico was examined using stable isotope techniques. Results revealed that fluid infiltration was restricted to an area around 17 m. wide from the contact. Most metachert bands served as aquifers for fluids with high water content. Results also showed that carbon dioxide-rich fluid through decarbonation infiltrated into nearby marble.

Metamorphism (Geology), Marble, Seeps (Geology), Seeps

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Metamorphic reactions between fluid inclusions and mineral hosts, part 1: Progress of the reaction calcite + quartz = wollastonite + CO2 in natural wollastonite-hosted fluid inclusions

Article Abstract:

A study of the progress of the metamorphic reaction calcite + quartz resulting in wollastonite + CO2 in natural wollastonite-hosted fluid inclusions involves the knowledge of bulk fluid compositions and densities. The calculations use unaltered inclusions in quartz. The calcite + quartz formation occurs during retrogression, inside the wollastonite-hosted fluid inclusions. The reaction reversal is possible in the microstage. The study provides important petrogenetic information.

Rocks, Metamorphic, Metamorphic rocks, Minerals (Geology), Inclusions, Rocks, Mineralogical chemistry, Rock-forming minerals

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