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贵州省中北部龙潭组煤的变质成因和“黔中隆起”构造具有特定的关系.分析了区域热液发育的背景条件,发现区内织纳煤田的煤级呈环状展布以及镜质组反射率梯度极其异常,结合阿弓向斜个别钻孔二氧化碳浓度异常及区域重力异常特征,认为“穹窿不均一”的岩浆热变质可能是贵州中北部煤级增高的主要原因.煤变质程度明显受龙潭组与可能的隐伏岩浆岩距离远近的影响,织纳煤田由于龙潭组下伏地层抬升剥蚀程度最大,利于向上传递岩浆热,导致煤级增高,反射率梯度值达到0.3%～0.4%/100m.
The metamorphic origin of coal in Longtan Formation in central-northern Guizhou has a specific relationship with the “Guizhou-Guizhou uplift” structure.According to the background conditions of hydrothermal development in the area, Based on the abnormalities of individual carbon dioxide concentration and regional gravity anomalies in the Archean syncline, it is considered that the “metamorphic heterogeneity” of the “dome” may be the main reason for the increase of coal rank in the central-northern Guizhou. The extent of the influence is obviously affected by the distance between the Longtan Formation and the possible hidden volcanic rocks. Due to the maximum uplifting and denudation of the underlying strata in the Longtan Formation, it is conducive to the upward propagation of magmatic heat and the increase of coal rank, and the gradient of the reflectivity reaches 0.3% -0.4 % / 100m.