临沂煤田煤变质因素的分析

临沂煤田煤变质受多种地质因素的影响,但是,各种煤质指标仍有其变化规律。区域变质作用使煤质达气肥煤阶段,岩浆侵入发生接触变质和气热变质作用,使煤质变为无烟煤和天然焦,煤的变质是上述各种变质作用的有效迭加,在广大区域内,区域变质作用为主,而在局部区域里可能岩浆侵入接触变质等的改造是主要的。

THE ANALYSIS OF METAMORPHIC FACTORS OF LIN YI COALFIELD

The coalification of Lin Yi coalfield is affected by a variety of geologic factors, but there are some rules in many parameters of coal rank. It is the regional metamorphism that causes the coal seam to the rank of highvolatile bituminous coal (gas-fat coal). The gas-heat metamorphism and the contact metamorphism of magma intrusion and tectonic movement change the seam to the anthracite and the natural coke. The coalification of these areas is effectively superimposed by each metamorphism mentioned above. In the extensive areas, the regional metamorphism is the most important, moreover, it is possible that the contact metamorphism and magma intrusion is principal in the local area