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Coal facies evolution of the main minable coal-bed in the Heidaigou Mine, Jungar Coalfield, Inner Mongolia, northern China

引用

Science China Earth Sciences 2007年第Z2期50卷 144-152页

作者： DAI ShiFeng REN DeYi LI ShengSheng ZHAO Lei ZHANG Yong State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China Department of Resources and Earth Science China University of Mining and Technology Beijing 100083 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China Department of Resources and Earth Science China University of Mining and Technology Beijing 100083 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China Department of Resources and Earth Science China University of Mining and Technology Beijing 100083 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China

The No. 6 Coal-bed from the Heidaigou Mine, Jungar Coalfield, Inner Mongolia is a super-large Ga deposit. The dominant carrier of Ga is boehmite in coal. The study of coal facies may provide genetic enrichment information of Ga and its carrier (boehmite) in the Ga deposit. On the basis of study on coal petrology and mineralogy, it was found that the No. 6 Coal-bed from the Heidaigou Mine of Jungar was enriched in inertinites and the microlitho-types were dominated by clarodurite. The maceral morphological features and association indicate that the coal-bed was formed in a dry sedimentary environment or in a periodic dry sedimentary environment caused by the alternating variations of groundwater level. The optimum conditions for the enrichment of Ga and its particular carrier (boehmite) were dominated by four transitional conditions: (1) the upper delta plain which was the transitional zone between alluvial and lower delta plains, (2) the transitional zone between the dry and wet forest swamps, being slightly apt to the dry one, (3) the transitional tree density between the thick and loose ones, and (4) the low moor that was the transitional zone between two high moors during peat accumulation.

关键词： coal, coal facies, Ga-deposit, maceral, mineral, Jungar Coalfield

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