Genetic relationships between swamp microenvironment and sulfur distribution of the Late Paleozoic coals in North China |
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Authors: | TANG Dazhen YANG Qi Zhou Chunguang KANG Xidong LIU Dameng HUANG Wenhui |
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Institution: | China University of Geosciences, Beijing 100083, China |
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Abstract: | The genetic relationships between microenvironment of the Late Paleozoic peat-forming swamp and the sulfur contents of coal
in North China have been studied by using coal-facies parameters involving gelification degree, tissue preservation index,
vegetation index, transportation index, groundwater influence index, water medium indicator and swamp type index, etc. Among
the various controlling factors of swamp microenvironment, swamp water medium elaborates a dominant action to sulfur accumulation
in the marine-influenced coals; while coal-forming plant type, hydrodynamic state and water covering depth are more important
to sulfur accumulation in the fresh water-influenced coals. Geological fractionation of sulfur isotopes reflects that sulfur
accumulation experienced multi-stages evolution. Pyrite sulfurs formed earlier than organic sulfur and the sulfur isotopic
δ34Sp shows lower values than organic sulfur isotopic δ34So. In the brine-influenced coals, sulfur accumulation processed relatively a long time span, the distribution of sulfur isotopes
dispersed, and the coals are provided with high sulfur contents. In the fresh-water-influenced coals, sulfur accumulation
occurred mainly at the syngenetic-penesyngenetic stage and the early diagenetic stage, and the total sulfur is lower and mainly
composed of organic sulfur. |
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Keywords: | North China the Late Paleozoic coals coal facies sulfur in coal sulfur accumulating mechanism |
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