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我国东部地区中生代的聚煤作用集中在早侏罗世以及中侏罗世的早期和中期。三叠纪仅晚三叠世有聚煤作用,白垩纪的含煤地层主要分布在东北地区和内蒙古地区,海拉尔盆地群和二连盆地群较集中。煤作为一种由高等植物转变而来的沉积型能源物质,其分布不仅受到古构造控制,还受到古气候和古地理的影响。整个中生代,东北地区气候和地理环境相对比较稳定,气候温暖潮湿,接受沉积的时间长,而华南地区气候变化相对比较频繁,中侏罗世晚期之后干旱的气候环境使聚煤作用几乎停止。所以东部地区煤层分布存在南北差异,北方含煤地层分布广,煤层厚度较大、稳定,南方晚侏罗世之后的煤层少有分布。
The Mesozoic coal accumulation in the eastern part of China concentrated in the early and middle Jurassic and Middle Jurassic. In Triassic, only Late Triassic coal accumulation, Cretaceous coal-bearing strata are mainly distributed in Northeast China and Inner Mongolia region, Hailaer Basin and Erlian Basin are more concentrated. As a kind of sedimentary energy material transformed from higher plants, coal is not only controlled by palaeostructures, but also influenced by paleoclimate and palaeogeography. The entire Mesozoic and northeastern regions have relatively stable climatic and geographical environments, warm and humid climates, long deposition times, and relatively frequent climate changes in southern China. In the late Middle-Jurassic, the arid climatic environment almost halted the coal accumulation. Therefore, there is a north-south difference in the coal seam distribution in the eastern region. The coal-bearing strata in the north are widely distributed and the coal seam is thick and stable. Coal seams after the Late Jurassic in the south are rarely distributed.