Petrology of Kakul Phosphorites, District Abbottabad, NWFP Pakistan
Abstract
Two basic types of phosphorite have been recognized within the Kakul stratigraphic sequence: 1) authigenic microcrystalline phosphorite mud (microsphorite) or orthochemical phosphorite which has precipitated either biochemically or physicochemically, and 2) pelletal phosphorite or allochemical phosphorite which has been modified into discrete clastic particles from microsphorite mud. Microscopically, the primary component is the carbonate fluorapatite matrix with cryptocrystalline dolomite, calcite and quartz. Also there are detrital grains of quartz, dolomite, and calcite with disseminated ferruginous matter.
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