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Economic Geology; September 1966; v. 61; no. 6; p. 1043-1063; DOI: 10.2113/gsecongeo.61.6.1043
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Carbonization of semi-anthracitic vitrinite by an analcime basanite sill

Hanan J. Kisch

A 13-foot sill is intruded below and has altered a 5-foot semi-anthracite seam in the Permian of the Bowen basin, Queensland. Ferromagnesian silicates of the intrusive were slightly altered by evolved volatiles. Vitrinite shows an increase from 2 to 12 percent in maximum reflectance towards the contact, approaching graphite-like optical properties. Within the range anthracite-meta-anthracite involved, two distinct types of vitrinite, A and B, show divergent reflectance characteristics.

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