A mechanism of aluminosilicate cementation to form a hardpan

Physics

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Scientific paper

Deposition of hydrous allophane from groundwater discharging from a bore drilled in a saline seep has been observed at Yalanbee, near Bakers Hill, in Western Australia. Similar allophane forms a part of the cementing agent of an extensive hardpan developed within a near surface horizon of a lateritic pallid zone, derived from granitic rocks. Currently allophane is being precipitated where acid highly saline and CO 2 -saturated groundwater contained in this pallid zone is discharged at a surface seepage which is persistent throughout the year. As CO 2 is released, the resultant increase in pH allows dissolved aluminum and silica to combine and precipitate as an allophane. Both the mechanism of precipitation, and the precipitate itself are very similar to that reported at Silica Springs in New Zealand; however, the New Zealand materials are deposited in a stream bed from highly carbonated waters of volcanic origin, a condition quite different from the Yalanbee situation.

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