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Journal of the Geological Society; 1994; v. 151; issue.4; p. 583-586;
DOI: 10.1144/gsjgs.151.4.0583
© 1994 Geological Society of London

Article

Channelled fluid infiltration and variation in permeability in Reynolds Range marbles, Australia

I. CARTWRIGHT1 & I. S. BUICK2

1 Victorian Institute of Earth and Planetary Sciences, Department of Earth Sciences, Monash University, Clayton Vic. 3168, Australia
2 Victorian Institute of Earth and Planetary Sciences, School of Earth Sciences, La Trobe University, Bundoora Vic. 3083, Australia

Strike-parallel flow of H2O-rich fluids through Reynolds Range marbles formed wollastonite-bearing assemblages. Wollastonite abundance varies on a millimetre de from 10 to 66 modal%. The mineralogy of unmetasomatized marbles suggests that the formation of more than c. 19% wollastonite requires silica metasomatism. Comparison with advective transport models suggests that the variable wollastonite contents may be explained by time-integrated fluid fluxes and intrinsic permeability varying by up to two orders of magnitude on a millimetre scale. Fluids were probably focused through the marble within microfractures and the variations in intrinsic permeability may reflect variable fracture density.




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