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本文着重利用煤质资料,对山东滕南煤田断层形成的时代进行了初步探讨,滕南煤田是昆仑——秦岭纬向构造带东延北支的一部份,属于石炭二迭纪煤田。关于其断层形成的时代,目前有两种意见:一种认为南北向断层早于东西向断层;另一种则认为东西向断层应早于南北向断层。我们研究了滕南煤田主要煤层的挥发份值,根据挥发份值计算了变质梯度,用变质梯度绘制了等变质面,发现等变质面在剖面上和平面上均有一定规律。在剖面上,等变质面与煤层近似平行,遇东西向断层连续通过,遇南北向断层则发生不同程度的错开,在平面上,等变质线基本上与煤层走向线平行,从而分析了煤化作用与断裂发生的相对时间关系,进一步论证了断层形成的时代。弄清滕南煤田形成的时代,这对进一步予测、勘探鲁西覆盖层下的石炭二迭纪煤田具有极为重要的意义。
This paper focuses on the use of coal quality data to discuss the age of fault formation in the Tengnan coalfield in Shandong Province. Tengnan coalfield is part of the eastern extension of the Kunlun-Qinling westerly tectonic belt and belongs to the Carboniferous-Permian coalfield. There are currently two opinions about the age of fault formation: one is that the north-south fault is earlier than the east-west fault and the other is that the east-west fault should be earlier than the north-south fault. We studied the volatile content of the main coal seams in the Tengnan coal field, calculated the metamorphic gradients based on the volatiles values, and mapped the metamorphic surfaces with the metamorphic gradients. We found that the metamorphic surfaces have certain regularities both in the cross section and in the plane. In the section, the metamorphic surface is approximately parallel to the coal seam, and is continuous with the east-west fault. The fault is staggered to some extent in the north-south fault plane. On the plane, the isoplasmic line is basically parallel to the coal seam strike line, The relative time relationship with the occurrence of faults further demonstrates the age of fault formation. To understand the formation of the Tengnan coalfield era, which further predicts the exploration of Luxi overburden Carboniferous Permian coalfield is of great significance.