The investigated Barail sandstones are chemically mature as indicated by the ICV while the ratio of SiO 2/Al 2O 3 indicated moderate sediment maturity. Also can be used in petrographic analysis, and any other scientific endeavor that involves three mutually dependent components. In the diagrams, one can see the clear groupings of the conglomerate clasts. Each sample is plotted on the diagram, with the clast samples shown as points and the proposed source samples shown as triangles. A de Finetti diagram is a ternary plot used in population genetics. 5) From the tabulated data, ternary diagrams (figure 4 through 14) were produced. Like Mason pointed out, this diagram neglects the alkalies. The curved line is the expected Hardy Weinberg frequency as a function of p. The diagram differentiates broadly sandstones, argillaceous rocks/shales, from mature soils on one side, and between these siliciclastic and carbonate rocks on the other side. The A-CN-K diagram and weathering indices such as CIA, PIA shows moderate to intense weathering in the source area. Ternary diagrams are used in classification and identification of lithofacies association in sandstone reservoir if there is no core taken in the interested part of the reservoir. The ternary diagram is based on the three components SiO 2, (Al,Fe) 2 O 3 ·xH 2 O, and (Ca,Mg)CO 3 (Figure 1). The sediments are also found to be derived from recycled sedimentary rock which is proved by ratios of Zr/Sc and Th/U. The binary diagram between ratios of Zr/Sc vs. Similarly, the high LREE/HREE ratios and negative Eu anomaly (La/Lu) cn, ratios of Eu/Eu*, La/Sc, La/Co, Cr/Th, Th/Sc, Th/Co and Cr/V ratio indicate felsic source. The ratio of Al 2O 3/TiO 2 and the ternary diagram of La-Th-Sc indicate felsic to intermediate source. The Chondrite normalised REE pattern show similar pattern to UCC (Taylor and McLennan 1985) with an enrichment of LREE and depletion of HREE. The geochemical characteristics of the rock are plotted in various binary and ternary diagrams and selected ratios of elements are interpreted in the light of source rock characteristics. log(Fe 2O 3/K 2O) of the Barail sandstones indicated that the sandstones belong to litharenite and wacke. log(Na 2O/K 2O) and log(SiO 2/Al 2O 3) vs. The geochemical classification based on diagrams of log(SiO 2/Al 2O 3) vs. The significance of the work is that it will uncover and reconstruct origin of Barail sandstone and restore the tectonic and paleoclimatic conditions based on petrography and geochemistry of the sandstone. The Oligocene age of Barail group of sedimentary rocks, exposed near the Indo Myanmar mobile belt, i.e., Champhai area, Mizoram have been studied to infer the provenance and paleoweathering history. Mizoram is geologically young comprising entirely of sedimentary rocks.
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