Coal Facies Study in Stephanien Basin of Blanzy一Montceau,France

Wu Xinqun

The Blanzy一Monctceau coal basin is an intramontaine rift located in North一East of massif centre of France. This paper cleals with the organo一facies in the first coal seam of basin, which is variable both in thickness and in quality. Macroscopically, the seam is largely dominated by clarain. The vertical variations in lustre, brightness and texture on polished section allow to subdivide the sample into many intervals and thus to be classified as coal facies. Eight facies are thus idendified. Detailled analyses have been performed for these coal facies by organic petrology approach and pyrolysis Rock一Eval. Facies A is telocollinite一rich and mineral一poor, contain much inertinite (fusinite) and low to very low percentages of exinite, whereas facies B is vitrinite一rich (telocollinite and desocollinite) and miner- al一poor, with median percentages of exinite and low to very low percentages of inertinite. Facies C is vitri- rite一rich (phyllovitrinite and desmocollinite) and mineral一poor, with much exinite and low to very low percentage of inertinite. Facies D contain more telocollinite and vitrodetrinite and high percentage of mineral (quartz and clay). Facies E contain more desmocollinite than telocollinite, with median percentage of mineral (pyrite). Facies F contain high percentage of corpocollinite and mineral (clay). Facies G and H is mineralrich, but different in occurrence. Use of the macerals as botanical markers and the texture (particle size, form, psephicity, gradation in- tensity etc.)as environment markers allow one to attribute each coal facies to different depositional environment .on the other hand, consideration of spatial distribution of facies in coal seam allows one to reconstruct the processes of coal formation. This coal seam is majoy allocthnous, with arborecent input. Within the coal seam, it exsists a cyclic deposit constructed by four major facies (facies A, G,B or C),similar to cyclothem present in coal一bearing formation. It is probably due to differential compaction in peat. Variation in coal faties is caused predominantly by water dynamic condition and water level and finally influences the physi一 chemical properties of maceral, such as vitrinite}reflectance, exinite fluorescence and hydrogen index of fatree.

1 Guangzhou Branch of institute of Geochemistry, Chinese Academy of Sciences;

Publish Date: 1994-03-10

Abstract: The Blanzy一Monctceau coal basin is an intramontaine rift located in North一East of massif centre of France. This paper cleals with the organo一facies in the first coal seam of basin, which is variable both in thickness and in quality. Macroscopically, the seam is largely dominated by clarain. The vertical variations in lustre, brightness and texture on polished section allow to subdivide the sample into many intervals and thus to be classified as coal facies. Eight facies are thus idendified. Detailled analyses have been performed for these coal facies by organic petrology approach and pyrolysis Rock一Eval. Facies A is telocollinite一rich and mineral一poor, contain much inertinite (fusinite) and low to very low percentages of exinite, whereas facies B is vitrinite一rich (telocollinite and desocollinite) and miner- al一poor, with median percentages of exinite and low to very low percentages of inertinite. Facies C is vitri- rite一rich (phyllovitrinite and desmocollinite) and mineral一poor, with much exinite and low to very low percentage of inertinite. Facies D contain more telocollinite and vitrodetrinite and high percentage of mineral (quartz and clay). Facies E contain more desmocollinite than telocollinite, with median percentage of mineral (pyrite). Facies F contain high percentage of corpocollinite and mineral (clay). Facies G and H is mineralrich, but different in occurrence. Use of the macerals as botanical markers and the texture (particle size, form, psephicity, gradation in- tensity etc.)as environment markers allow one to attribute each coal facies to different depositional environment .on the other hand, consideration of spatial distribution of facies in coal seam allows one to reconstruct the processes of coal formation. This coal seam is majoy allocthnous, with arborecent input. Within the coal seam, it exsists a cyclic deposit constructed by four major facies (facies A, G,B or C),similar to cyclothem present in coal一bearing formation. It is probably due to differential compaction in peat. Variation in coal faties is caused predominantly by water dynamic condition and water level and finally influences the physi一 chemical properties of maceral, such as vitrinite}reflectance, exinite fluorescence and hydrogen index of fatree.

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[1]

1 Berner R. A.，1984, Sedimentory pyrite formation: un update. Geachim. Cosmochim. Acts, 48, p. 606一615.

2 Bertrand P.，1989, Microfacies end petroleum properties of coal as revealed by a study of North Sea Jurassic coals. Int. J.Coal Geol.，13, p. 575一595.

3 Branchet M.，1983, Le bassin houiller de Blanzy, presentation generate. Compte一rendu de le reunion de la RCP 642 du CNRS, p. 1一28.

4 Diessel C. F. K.，1986, On the correlation between coal fecies end depositionel environments. Proc. 20th Symp. Dep. Geol.，Univ. Newcastle, N. S. W.，p.19一22.

5 Geataldo R. A.，Demko T. M. & Liu Y.，1989, Mecaniems to explain persistent elternati。川of clastic and peat一accumulating swamps in Carboniferous sequences. In an international conference on the geology and sedimentology of coal and coal bearing strata, coal composition and properties, Orleans, France, September 1989.

6 Guion P. D.，1987, The influence of a palaeochennel on seam thickness in the Coal Measures of Derbyshire, England. Int.J. Coal Gaol.，7, p.269一299.

7 Hagemann H. w. & Hollerbach A.，1979, Relationship between the macropetrographic and organic geochemical composition of lignites. In Douglas A. G. and .Maxwell (ed.)，Advances in Organic Geochemistry 1979, Pergamon Press.I. C. C. P.，1975, Lexique international de petrographie des charbons du Comite international de petrographie des charbons.Edition 1975, CNRS, Paris.

8 Merriam D. F. (ed), 1964, Symposium on cyclic sedimentation. Bulletin of the Kansas Geological Survey, 169, Vols 1 &.2.

9 Russell N. J.&Barron P. F.，1984. Gelificetion of Victorian Tertiary soft brown coal wood. II. Changes in chemical atructure associated with variation in the degree of gelification. Int. J. Coal gaol.，4, p. 119一142.

10 Smith A.H. V.，1962, The palaeoecology of Carboniferous pests based on the micrpores and petrography of bituminous coals. Proc. Yoreshire Geol. Soc.，33, p.423一474.

11 Smyth M.，1984, Coal microlithotype related to sedimentary environments in the Cooper Basin, Australia. Ins Rehmani R.A.&Flores R. M. (ads) Sedimentology of coal and coal bearing Sequences. Spec. Public. Int. Ass. Sedimentologists, 7, Blackwell Scientific Publication, Oxford, p. 333一347.

12 Stopes M. C.，1919, On the four visible ingredients in banded bituminous coal. Proc. R. Soc.，London, B,90, P.470一487.

13 Teichmuller M.，1962, Die genese der Kohle. Compte一rendu Quatrieme Congres International de Stratigraphie et de Geologie de Carbonifere, Heerlen, 1958, 3, p. 699一722.

14 Ting F .T. C.，1989, Facies in the Lower Kitanning coal bed, Appalachian Basin (USA). Int. J. Coal Gaol.，12, p. 425一442.

15 Winkler E.，1986, Organic Geochemical investigation of facies analysis of seam banding in the Helmstedt deposit. Int. J.Coal Geol.，10. p. 617一624.

16 Wu X. Q.&Bertrand P.，1990. Pouvoit reflecteur et rang de quelques charbona du basain de Blanzy一Montceau. Rewe de Phyaiophile. No. 112, p.61一70.

Coal Facies Study in Stephanien Basin of Blanzy一Montceau,France

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