Paleo-peat sedimentary environment and controlling on trace elements: example from the 11# coal seam in Donglutian Coalmine of Ningwu Coalfield
WANG Guoquan1,2, SUN Beilei1,2, LIU Chao1,2, WU Jie3, PAN Xinyu1, $\boxed{\hbox{ZENG Fangui}}$ 1,2
1 College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China; 2 Shanxi Key Laboratory of Coal and Coal-measure Gas Geology,Taiyuan 030024,China; 3 State Key Laboratory of Coal and CBM Co-Mining,Shanxi Jincheng 048012,China
Abstract：The paleopeat-forming environments plays an important role in the enrichment of trace elements in coal. Coal facies and related geochemical parameters are important indicators for the paleopeat environmental condition. In this paper,the coal facies parameters,geochemical parameters and mineralogical characteristics were used to reconstruct the paleopeat-forming environments of the 11# coal seam in Donglutian Coalmine from Pingshuo district,Ningwu Coalfield, and the influence of paleopeat-forming environments on trace element enrichment was discussed. The results show that: 1)The coal facies of the Donglutian Coalmine 11# coal seam include three types,i.e.,the low swamp of the barrier island lagoon,lower delta plain and upper delta plain. Under the influence of transgression,the pH,paleosalinity,redox degree and hydrodynamic conditions of marsh water show the periodic variation. 2)The contents of Li with an average value of 133.50μg/g,Zr with an average value of 198.12μg/g and Pb with an average value of 60.76μg/g in 11# coal seam are much higher than those of the hard coal in the world. 3)In the profile of coal seam,trace elements in 11# coal seam show two different assemblages, i.e.,Li-Zr-Nb-Ta-Hf and Pb-Cu-Ga-Ge-Tl-REY. The former assembly is mainly enriched in DLT-11-2,DLT-11-6 and DLT-11-10,which are characterized by similar sedimentary environments,i.e.,seawater,anoxic to euxinic conditions,strong hydrodynamic conditions,with relatively low sulfur content,the low swamp facies in the barrier island-lagoon. The latter assembly is mainly enriched in DLT-11-0、DLT-11-4 and DLT-11-8,which are characterized by similar sedimentary environments,i.e.,seawater,alkaline,oxic or anoxic conditions,weak hydrodynamic conditions,with relatively high sulfur content,lower swamp facies of the lower delta plain. These results would provide valuable theoretical basis for reasonable mining target selection of metal mineral resources and clean utilization of coal resources in other coal-bearing basins.
WANG Guoquan,SUN Beilei,LIU Chao et al. Paleo-peat sedimentary environment and controlling on trace elements: example from the 11# coal seam in Donglutian Coalmine of Ningwu Coalfield[J]. JOPC, 2022, 24(6): 1210-1223.
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