Abstract
Graphite forms crystals up to 0.08 mm in size in carbonates or argillaceous carbonates directly under- and overlying black shale. Increased contents of Si, Al, Ca, and K in graphite are related to intercalations of graphite-montmorillonite and less to intercalations of graphite-illite. Quartz and gibbsite are also detected. The formation of graphite was probably a two-stage process: To a less extent the process of dehydrogenesis and conjugation of aromatic rings took place in a reaction with Al, Si, and OH of phyllosilicates producing Al(OH)3 (gibbsite), former H4SiO4 (now quartz), and H2O.
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