本文選題：淮北煤田 + 構(gòu)造特征　； 參考：《煤田地質(zhì)與勘探》2017年03期

【摘要】：淮北煤田位于徐宿弧形推覆構(gòu)造帶前緣和外緣帶。通過(guò)分析區(qū)域地質(zhì)資料,并結(jié)合野外地質(zhì)調(diào)查,探討了淮北煤田的構(gòu)造、演化特征及其形成機(jī)制。結(jié)果表明:(1)以宿北斷裂為界將淮北煤田劃分為南、北2個(gè)構(gòu)造分區(qū),北區(qū)構(gòu)造線總體走向近SN—NNE,呈向西凸出的弧形展布,以逆沖斷層為主,發(fā)育侏羅山式長(zhǎng)軸褶皺;南區(qū)構(gòu)造線走向NNW和NNE,以正斷層和開(kāi)闊短軸褶皺為主。(2)北區(qū)處于徐宿推覆構(gòu)造主體部位,蕭縣背斜及其以東地區(qū)為上盤(pán)推覆體,蕭縣背斜以西地區(qū)屬上盤(pán)推覆體;南區(qū)以西寺坡斷層為界,該斷層以東地帶位于徐宿弧形構(gòu)造帶東南末端,屬推覆構(gòu)造上覆系統(tǒng),西寺坡斷層以西地區(qū)為推覆體下伏系統(tǒng)。(3)自石炭-二疊紀(jì)含煤地層沉積后,淮北煤田至少經(jīng)歷了3期較大的構(gòu)造事件,即印支期近SN方向的擠壓,形成近EW向斷裂構(gòu)造為主;燕山早期NWW—SEE方向的強(qiáng)烈擠壓作用,形成徐宿弧形構(gòu)造;燕山晚期NNE—SSW方向擠壓,在煤田內(nèi)形成大量NNE—SSW方向正斷層。
[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.
【作者單位】： 南京大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41372158)~~
【分類(lèi)號(hào)】：P618.11

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