Micrite depth

The four bronze samples were each sprayed with simulated rain according to the procedure for the Micrite 3.0 above. Each bronze was sprayed until 30 ml was collected in the collection bottles, being equivalent to 1.0 cm of simulated rain. These water samples were then analyzed for copper and zinc on the AA instrument. An air dry time of 30 minutes was typical. Each Bronze 3.0 was subjected to 300 simulated rains, while the Bronze 4.0 5.6 received only 150. Engraved letter depths and overall dimensions of each were measured after every 30 events. 

Table I. Depths of Engraved "ACID RAIN" Letters in Micrite 3.0...

Figure 1. Letter depth changes for engraved letters for the Micrite sample at pH=3.0.

In addition to dissolution, the destabilization of carbonate cements may result in recrystallization and replacement by other carbonates. Microcrystalline calcite and dolomite are sensitive to recrystallization at various burial depths. The recrystallization of dolomite has been reviewed by Mazzullo (1992). Burial recrystallization of micritic/microsparitic cements in sandstones may result in the formation of poikilotopic calcite (Saigal Bjorlykke, 1987). However, poikilotopic calcite is also a common primary cement in calcretes (e.g. Knox, 1977 Tan-don Narayan, 1981). Recrystallized calcite and dolomite are recognized as patchily distributed, coarsened crystals. In contrast, precipitational vari-... 

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