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大同煤田由印支运动进入地洼阶段。地洼呈短带状分布在伊陕地台区吕梁台隆的北部。 云岗地洼始于三叠纪末,形成巨厚的陆相复矿砂岩建造(含煤建造及红色建造等),含煤7组14层。与下伏地层不整合接触。短线褶曲发育,分北东和北西两组,伴有断裂。沿断裂从中酸性岩侵入到玄武岩大面积喷发有三次岩浆活动。下部建造中古植物为coniopteris—pboeniopsis早晚两个组合。地洼的活动中心向西北侧向迁移。地洼的形成与发展对中,古生代煤层赋存、煤变质关系密切。 该煤田地洼型含煤建造的研究,进一步澄清(J_1与P_1~2、P_2~1)地层时代。区分出中、古生代构造层。一些地质问题相应地解决。
Datong Coalfield by the Indo-Chinese Movement into the depression stage. Di depression was a short strip distribution in the northern part of Lvliangtailong of Taiwan. Yungangdiwa began at the end of the Triassic period and formed a huge continental facies complex sandstone (coal-bearing construction and red building, etc.) with 14 layers of 7 coal-bearing groups. Unconsolidated contact with underlying formation. Short-term fold development, divided into North East and North West two groups, accompanied by rupture. Along the fault from the acidic rocks intrusion into a large area of basalt eruption has three magmatic activities. The lower part of the ancient plant is coniopteris-pboeniopsis. Di depression activities center to the northwest migration. The formation and development of the depression are closely related to the occurrence of the Middle and Paleozoic coal seams and metamorphism of coal. The study on the formation of low-lying coal-bearing coal in the coalfield further clarifies the age of the strata (J_1 and P_1 ~ 2, P_2 ~ 1). Distinguish between the Middle Paleozoic tectonic layer. Some of the geological problems have been resolved accordingly.