Reported the characteristics and evolution of coal metamorphism in Shuanghua coalfield,specially calculated paleo temperature,determined the coking coal is the magmatically metamorphosed coal.

• 论述了双桦煤田煤变质特征及其演化，分析了影响煤变质的主要因素，估算了古地温，确认岩浆热变质是形成焦煤的主要作用形式，为在该煤田寻找焦煤指出了方向。