摘要
本文简要地概括了中国煤变质的特点和煤级分布规律;指出中国赋存着储量丰富的能够满足多种用途的各煤级煤是三个变质演化阶段的综合结果。第一阶段是以深成变质作用形成低煤级煤为主;第二阶段叠加的区域岩浆热变质作用使部分低煤级煤上升为中、高变质煤:第三阶段的构造变动奠定了中国煤变质带分布的总格局。鉴于煤变质研究是预测煤质与指导开采所需煤种的理论基础,文中提出了应从煤变质作用实质、各变质作用类型的特点、探讨新的煤变质作用类型,完善煤级参数以及成煤古温度等方向加强研究。文中附有从地质因素分析入手,以煤变质作用类型研究为基础的中国各时代煤级分布概略图。
In China the coal occurs north to 38°N. Lat. , being mainly the bituminous coal and lignites of low rank. Along and south to 38°N. Lat. in North Chinabituminous coal and anthracites occur. Medium and low volatile bituminous coal and anthracites predominate in southwestern China,while anthracites and low volatile bituminous coal play a leading role in southeastern China. Such characteristics of Chinese coal metamorphism could not be formed by the geothermal metamor-phism during the first evolutional stage of coal metamorphism alone because the burial depth was usually shallow; the coal of higher rank was formed during the second evolutional stage, then the magmatic activities, especially the mesozoic magmatic intrusives promoted a part of the low ranking coal to form the medium and/or high ranking one,and many coal metamorphic zonings of low to high rank were formed. In the third evolutional stage as most coal measures had been uplifted to depths near the earth surface, the geothermics under which the coal suffered in this stage was too low to further raise the coal rank,however,the Tertiary crustal movement settled the distribution of the coal metamorphic zones mainly through dislocation. As the study on coal metamorphism is the theoretic basis of coal rank needed, research directions such as the essence of metamorphism,discovering new types of metamorphism not yet known, the feature improvement of the coalification parameters and the paleotemperature of coalification are emphasized.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1989年第4期341-345,共5页
Earth Science-Journal of China University of Geosciences
关键词
煤变质
煤级
中国
geothermal metamorphism of coal,telemagmatic metamorphism of coal, evolutional stage of coal metamorphism
