00/00761 Study of co-liquefaction of coal liquefaction residue with plastic

Abstract

This chapter discusses some of the more widely used descriptive and genetic classifications of marine limestones and dolomites, which have been proposed during recent decades of research on, carbonate rocks. Carbonate containing more than 50% of carbonate minerals; and recognize limestone and dolomite as the two compositional end-member types. Limestones and dolomites have historically been classified based on mineralogy, texture, and particulate composition. Dolomites have been variously classified based on Ca/Mg ratio, mineralogic composition, presence (or absence) of relict textures, crystal texture and fabric, environment of deposition, geochemical environment of formation, and timing of dolomitization. The rhombohedra1 mineral dolomite has near-ideal stoichoimetric composition given by the formula CaMg(C03)2, and crystals are generally well ordered. Dolomitic rocks are also classified on petrographic criteria, and recognized the following gradational series: magnesian limestones and chalks, dolomitic limestones (including bioconstructed or bioaccumulated types), finegrained dolomitic limestones, dolomitic chalks, dolomitic lithocalcirudites, lithocalcarenites, biocalcirudites and biocalcarenites, dolomitic oolitic calcarenites and calcilutites, and dolomites. Classifications of replacement dolomites based on crystallinity are proposed, and these may be applied to dolomites in which relict textures and fabrics may or may not be identifiable. Two such widely used classification schemes that have utility in describing crystallization textures and fabrics in dolomites.