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Mineralogy of Graphite from the Graphite-Bearing Schists of Wadi Lawi, South Eastern Desert, Egypt



Author(s)

Ahmed M. Bishady

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DOI:10.17265/2328-2193/2017.04.004

Geology Department, Faculty of Science, Menufiya University, Shebin El-Kom, Mnufiya, Egypt

The graphitized schists of Wadi Lawi, South Eastern Desert, Egypt, had been investigated to exhibit the mineralogy of the graphitic material, and its structural state, to reveal its conditions. The graphite included quartz-plagioclase-actinolite-graphite schist and actinolite-talc-chlorite-graphite schist. It occurs as bundles and laths, showing Rmax in oil from 10 to 14. Magnetite is the major associate with graphite or disposed in the groundmass. XRD, DTA patterns, TEM and TMD investigations of separated graphitic material, show that it ranges in its structure from semi-graphite (graphite-d1) to graphite (full-ordered graphite). δ¹³ C (PDB) with an average of -23.06‰, in addition, the IR investigations for these graphitic materials indicate their organogenic origin. The present author suggests the possibility that Wadi Lawi graphitic material is related to post-depositional contaminations. XRD and DTA can also declare that the graphitic materials were formed under conditions of greenschist facies in a temperature range of 400 to 600 °C, under a pressure of 4 to 6 kP.

Graphite, Wadi Lawi, ophiolites, mineralogy, structural state.