淮北煤田构造特征和形成机制

发布时间：2018-06-11 22:40

本文选题：淮北煤田 + 构造特征　；参考：《煤田地质与勘探》2017年03期

【摘要】：淮北煤田位于徐宿弧形推覆构造带前缘和外缘带。通过分析区域地质资料,并结合野外地质调查,探讨了淮北煤田的构造、演化特征及其形成机制。结果表明:(1)以宿北断裂为界将淮北煤田划分为南、北2个构造分区,北区构造线总体走向近SN—NNE,呈向西凸出的弧形展布,以逆冲断层为主,发育侏罗山式长轴褶皱;南区构造线走向NNW和NNE,以正断层和开阔短轴褶皱为主。(2)北区处于徐宿推覆构造主体部位,萧县背斜及其以东地区为上盘推覆体,萧县背斜以西地区属上盘推覆体;南区以西寺坡断层为界,该断层以东地带位于徐宿弧形构造带东南末端,属推覆构造上覆系统,西寺坡断层以西地区为推覆体下伏系统。(3)自石炭-二叠纪含煤地层沉积后,淮北煤田至少经历了3期较大的构造事件,即印支期近SN方向的挤压,形成近EW向断裂构造为主;燕山早期NWW—SEE方向的强烈挤压作用,形成徐宿弧形构造;燕山晚期NNE—SSW方向挤压,在煤田内形成大量NNE—SSW方向正断层。
[Abstract]:Huaibei coalfield is located in the front and outer margin of Xushu arc nappe belt. Based on the analysis of regional geological data and field geological survey, the structure, evolution characteristics and formation mechanism of Huaibei coalfield are discussed. The results show that the Huaibei coalfield is divided into two tectonic subzones in the north and south by the Subei fault. The general strike of the northern tectonic line is close to SN-NNE.Their arc distribution is westward, and the thrust fault is the main one, and the Jurassic type long axis fold is developed. NNW and NNEA strike in the southern region, with normal fault and open short-axis fold as the main part.) the northern part is located in the main part of the Xuzhou-nappe structure, the Xiaoxian anticline and its east area are the upper plate nappe, and the area west of the Xiaoxian anticline belongs to the upper-plate nappe, and the area to the west of Xiaoxian anticline belongs to the upper plate nappe. The area to the east of the fault is located at the southeast end of the Xushu arc structural belt, which belongs to the nappe overlying system, and to the west of the Xisipo fault is the nappe underlying system. The area to the west of the fault is the nappe underlying system, which has been deposited since the Carboniferous and Permian coal-bearing strata. The Huaibei coalfield experienced at least three large tectonic events, namely, the compression of the Indosinian near SN direction, the formation of the near-EW fault structure, the strong compression in the early Yanshanian NWW-SEE direction, and the formation of the Xuzhou-arc structure. During the late Yanshanian period, NNE-SSW direction was squeezed and a large number of NNE-SSW normal faults were formed in the coalfield.
【作者单位】：南京大学地球科学与工程学院;
【基金】：国家自然科学基金项目(41372158)~~
【分类号】：P618.11

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