焦作煤田二_1煤层煤变质作用特征及其影响因素

Features of Coal Metamorphism and Influence Factors of Ⅱ_1 Coal-bed in Jiaozuo Coal-field

燕山期深成岩浆热变质作用,使二1煤层由低煤级的烟煤阶段上升到D段无烟煤三号高变质阶段,同时叠加的浅成岩浆热变质作用,使二2煤层变质程度达到E段无烟煤一号或E段无烟煤二号变质阶段,形成煤田中部煤变质程度低于东西两端的变化格局。

Hypogene magma thermal metamorphis m of Yanshan stage,makeⅡ2coal -bed from bituminous coal of lo wer coal rank rised to D section of No.3anthracite in high metamorphic stage,in the mea nwhile,the stacking epizonal magma thermal meta-morphism,make metamorphic degree o fⅡ2coal -bed reached to E section of No.1anthracite or E section of No.2anth racite.Thus formed the change pattern of coal metamorphic degree:lower degree i n the mid -part of coal -field,but hig her degree in the east and west ends of coal -field.