Microfacies types of coal seams in Upper Silesian Coal Basin

Krystyna Kruszewska

Abstract


The microfacies character of Upper Silesian coal seams has been investigated on the ground of microlithotype analises. As a result following microfacies types of coal seams have been determined: I - basic type, the most common one, with coal composed predominantely of vitrite and trimacerite, both of them exceeding 15% amount; other microlithotype groups are in minority; II - vitrite type where only vitrite exceedes 15% and other microlithotype groups are in minority; III - clarite type, where apart of vitrite and trimacerite also clarite exceedes 15% of total amount; IV - durite-inertite type where apart of vitrite and trimacerite also either durile of inertite (or both) exceedes 15 % of total amount; V - mixed type where apart of vitrite and trimacerite also clarite and either durite or inertite (or both) exceedes 15% of total amount; VI - carbominerite type where apart of vi trite and trimacerite as well as other microlithotype groups also carbominerite exceedes 15%.

The distribution of these types throughout the Upper Carboniferous succession in Upper Silesian Coal Basin, compared with macrofacial development of associated rocks, suggest following conclusions: 1 - there is uniformity in macro-and microfacies in Upper Silesian coal-bearing formation; 2 - the microfacies character of Upper Silesian coals can be used as an indicator of their genetic conditions; 3 - forest swamps were the main source for coal seam formation but during Westphalian A and B also calamitean reeds played probably also an important role; 4 - the microfacies characteristics of coal seams can be applied in practice for predicting their industrial application.


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