Subject Oxygen isotope compositions

There seems to be no obvious systematic difference in the amount or type of calcite cementation in sandstones that have been buried to depths of 4-5 km and temperatures of more than 150°C versus otherwise unconsolidated sandstones that have not been deeper than 1.5 km and that have not been subjected to temperatures of more than around 70°C (Plate 9 Table 1). This suggests that most calcite cementation is probably complete at shallow to moderate burial depths and at relatively low temperatures, although examples of later calcite precipitation that postdates initial quartz cementation have been documented (e.g. Saigal Bjor-lykke, 1987 Walderhaug, 1990 Taylor Soule, 1993). The oxygen isotopic compositions of calcite... 

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