Diagenetic evolution of onshore Campanian Sandstone, Ariyalur-Cauvery Basin
The onshore Campanian (Sillakkudi Fm.) sandstone is sub-angular to angular sorted grains of quartz (97%), feldspar (2.5%) and lithic fragments (0.5%) of continental block provenance derived by the rapid rate of erosion under hot and humid climate. The fabric signifies the free-floating (33%), point contact (46%), long contact (17%), suture contact (2.5%) and concavo-convex contact (1.5%). The relatively high percentage of free-floating grains and point contact cemented by calcite cement, suggesting the early cementation process and diminutive compaction. Whereas the 63% of point and long contact and 4% of the suture and concavo-convex contact symptomatic of the early calcite cementation and mechanical compaction in excess of the chemical compaction.
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