The timing of high-temperature retrogression in the Reynolds Range, central Australia: constraints from garnet and epidote Pb-Pb dating

Article Abstract:

The garnet and epidote quartz veins at the Lower Calcsilicate Unit-Napperby Gneiss contact in the Reynolds Range in central Australia were examined to determine the time of high-temperature retrogression in the range. Results from the Pb stepwise leaching on garnet from the quartz veins indicated that the fluid recycling in the high-grade rocks was controlled by partial melting and melting crystallization. Moreover, the 100-120 age difference observed between the intergrown garnet and late epidote suggests that the vein systems were subjected to multiple fluid flow episodes.

Quartz, Garnet

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Fluid flow in marbles at Jervois, central Australia: oxygen isotope disequilibrium and zoning produced by decoupling of mineralogical and isotopic resetting

Article Abstract:

Determining fluid flow patterns and sources is important to understanding crustal evolution. Stable isotope geochemistry is successfully used in fluid-rock interaction studies. The infiltration of water-rich fluids into marbles from Jervois, central Australia is described. Some marbles garnet grew when the deltasuper18O values of the host rock were changing, due to different fluid volumes needed to reset mineralogies and oxygen isotopes. Marbles outside the fluid-flow zones consisted of calcite + quartz + anorthite + diopside plus or minus phlogopite.

Observations, Mineralogical research, Isotopes, Fluids, Flow (Dynamics), Metamorphism (Geology)

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Internal control of fluid compositions in amphibolite-facies scapolitic calc-silicates, Mary Kathleen, Australia

Article Abstract:

Research describing infiltration of fluid compositions in amphibolite-facies scapolitic calc-silicates is presented. The study focuses on metasediments found in the Mary Kathleen Fold Belt, Australia. These metasediments were characterized by minimal seepage of external fluids in the process of regional metamorphism. It is shown that calc-silicate layers prevented the infiltration of fluids in the H2O-CO2-NaCl-HCl system.

Composition, Silicates, Seepage, Seepage (Hydrology), Amphiboles

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