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西北地区中生代含煤地层和煤变质特点的研究进一步表明，石英脉及方解石脉的发育特征与煤变质关系密切。煤变质程度越高，岩脉发育越好。中－高变质煤煤系石英脉的规模、产状、密度、空间组合、脉岩矿物包裹体均化温度等宏－微观特征，可以指示煤变质的热源体、热传播途径、古地温值、变质带分布规律、变质作用类型等；低变质煤煤系石英脉一般不发育。本文所论及岩脉规模较小，易被忽略。但这些岩脉是含煤盆地构造、地热、流体活动等地质信息的载体，颇有研究价值。
The study on Mesozoic coal-bearing strata and coal metamorphism in Northwest China further shows that the developmental characteristics of quartz veins and calcite veins are closely related to coal metamorphism. The higher the degree of coal metamorphism, the better the development of dikes. The metamorphic coal-bearing quartz veins have macroscopic-microcosmic characteristics such as scale, occurrence, density, space combination and homogenization temperature of vein mineral inclusions, which can indicate coal metamorphic heat source body, heat transmission path, paleo-geothermal value, Metamorphic belt distribution, metamorphism type, etc .; low metamorphic coal and quartz vein generally undeveloped. The dykes mentioned in this paper are small and easily overlooked. However, these veins are the carriers of geologic information such as tectonic, geothermal and fluid activities in coal-bearing basins, and have considerable research value.