Abstract

Unconsolidated sandstone of the Triassic Botucatu Formation from the Parana Basin, Brazil, was silicified using heat, distilled water, and laboratory apparatus that provided the solubility and subsequent precipitation of silica existent in that rock.

The results show that silica is easily mobilized from sandstone through water percolating a short distance and during a brief period of time, and that many of the observed cases of cementation in the Botucatu sandstone are related to precipitation by evaporation of silica existent in ground water. Most of the silica is acquired rapidly as rain water penetrates the sandstone and slowly reaches the average detected value of 25 mg/1.

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