TY - JOUR N2 - Anthracite coal matter fills irregular voids in dolostones of the Upper Proterozoic Höferpynten Formation in the Hornsund area, south Spitsbergen. The coals are of organic origin, as indicated by a variety of coal-petrographic studies, and by association with algal structures. They probably derived from bitumina accumulated in voids of dolostone at an early diagenelic stage. The degree of coalification (graphitization) is high but diversified, suggesting several coalification stages, probably related t o successive metamorphic events. The oldest changes may correspond to initial stage of t h e greenschist-amphibolite phase of regional metamorphism, with temperatures of over 500°C and pressure of over 20,000 MPa . Multiphase graphite crystallites which occur in t h e coal are mainly fibrous. There are also crystallites which precipitated from gaseous phase, and pyrolitic graphite; they may have originated due to action of mesothermal solutions which had produced ore-bearing veins. L1 - http://journals.pan.pl/Content/111082/PDF/1992-2_071-090.pdf L2 - http://journals.pan.pl/Content/111082 PY - 1992 IS - No 2 EP - 90 KW - Arctic KW - Spitsbergen KW - Late Proterozoic KW - anthracite coal A1 - Birkenmajer, Krzysztof A1 - Frankiewicz, Jerzy K. A1 - Wagner, Marian PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 13 DA - 1992 T1 - Late Proterozoic anthracite coals from the Hornsund area, south Spitsbergen SP - 71 UR - http://journals.pan.pl/dlibra/publication/edition/111082 T2 - Polish Polar Research ER -