【摘要】：燕山造山帶是發(fā)育在華北板塊東北部的一個(gè)板內(nèi)造山帶,西起內(nèi)蒙包頭,東到渤海灣,整體構(gòu)造方向?yàn)闁|西向,造山帶東端則轉(zhuǎn)為北東-北北東向。本文研究區(qū)牛營(yíng)子-郭家店盆地位于燕山造山帶東段,是一個(gè)被后期構(gòu)造強(qiáng)烈改造的小型盆地。針對(duì)該盆地中地層的沉積特征和構(gòu)造特征,得到以下認(rèn)識(shí):鄧杖子組主要由一套分選性和磨圓度都很差的碳酸鹽質(zhì)礫巖組成,礫巖的成分和結(jié)構(gòu)成熟度都說(shuō)明它的形成與劇烈的構(gòu)造活動(dòng)緊密相關(guān),是研究區(qū)內(nèi)晚三疊世時(shí)期強(qiáng)烈構(gòu)造變動(dòng)的沉積記錄,且與其下伏地層水泉溝組呈整合接觸。二者為一套由西向東變新的單斜地層;本文還確定了牛營(yíng)子-郭家店盆地內(nèi)鄧杖子組所構(gòu)成的礫巖層中礫石成分的變化規(guī)律,并根據(jù)礫石成分的不同將鄧杖子組分為3段:鄧杖子組1段以安山巖礫石為主,沿剖面向上礫巖中安山巖礫石成分減少,而灰?guī)r礫石成分增加,至該段上部礫石成分變?yōu)橐曰規(guī)r礫石為主,該段礫石主要來(lái)源于水泉溝組和寒武-奧套系地層;鄧杖子組2段礫石成分有灰白-灰色、薄層-中厚層泥晶白云質(zhì)巖、灰黑色硅質(zhì)頁(yè)巖、海綠石石英砂巖和灰綠色輝綠巖,礫石主要來(lái)源于青白口系地層;鄧杖子組3段礫石以燧石條帶灰白-灰色白云巖、白云質(zhì)灰?guī)r為主,具少量褐紅色、褐黃色含Mn白云巖、灰綠色輝綠巖、硅化頁(yè)巖及石英砂巖,礫石主要來(lái)源于薊縣系。鄧杖子組礫巖在剖面上具明顯的倒序巖屑地層特征,反映了物源區(qū)正常的層序地層,并結(jié)合盆地周?chē)牡貙�、�?gòu)造特征,對(duì)牛營(yíng)子一郭家店盆地鄧杖子組礫巖可能的物源區(qū)進(jìn)行了分析和討論,指出牛營(yíng)子-郭家店盆地的物源區(qū)為盆地西側(cè)。最后本文確定了盆地中部?jī)蓚�(gè)近直立的斷層(大齊子斷層和朱杖子斷層)的復(fù)雜的變形史:在晚三疊世,元古代地層向南東方向逆沖于鄧杖子組之上,隨后二者由于再一次的構(gòu)造作用而發(fā)生變形,因此,目前所見(jiàn)到的牛營(yíng)子-郭家店盆地是一個(gè)經(jīng)歷后期強(qiáng)烈構(gòu)造改造和剝蝕的殘余盆地,而不是一個(gè)原形盆地。
[Abstract]:Yanshanian orogenic belt is an intraplate orogenic belt developed in the northeast of North China plate. It starts from Baotou in the west and reaches Bohai Bay in the east. The whole tectonic direction is east-west, and the eastern end of the orogenic belt is turned to NE-NNE. The Niuyingzi-Guojiadian basin, located in the eastern section of the Yanshanian orogenic belt, is a small basin which was strongly reformed by late structure. According to the sedimentary and structural characteristics of the middle strata in the basin, the following conclusions have been obtained: the Deng Changzi formation is mainly composed of a set of carbonate conglomerates with poor sorting and roundness. The composition and structural maturity of conglomerate indicate that its formation is closely related to the intense tectonic activity and is a sedimentary record of strong tectonic changes during the late Triassic in the study area and is in integrated contact with the underlying formation of Shuiquangou formation. The two are a set of monocline strata changed from west to east. The variation law of gravel composition in the conglomerate formed by Deng Chang Zi formation in Niuying Zi-Guojiadian Basin is also determined. According to the difference of gravel composition, Deng Chang Zi component is divided into three sections: the first member of Deng Chang Zi formation is dominated by andesite gravel. Along the section, the gravel composition of andesite in the conglomerate decreases, but the gravel composition of the limestone increases, and the gravel composition of the upper part of the section becomes dominated by the limestone gravel, which is mainly derived from the Shuiquangou formation and Cambrian-Ordovician strata. There are gravel-gray, thin-layer and medium-thick mudstone dolomite, grey-black siliceous shale, glauconite quartz sandstone and grey-green diabase in the second member of Dengzangzi formation. The gravel is mainly derived from Qingbaikou strata. In the third member of Dengzhang formation, the gray-gray dolomite is mainly composed of flint stripe, dolomitic limestone with a small amount of brownish-red, brown-yellow Mn dolomite, grey-green diabase, silicified shale and quartz sandstone, and the gravel is mainly derived from Jixian system. The conglomerate of Dengchangzi formation has obvious inverted sequence lithic stratigraphic characteristics in the section, which reflects the normal sequence stratigraphy of the provenance region, and combines with the strata around the basin and structural characteristics. This paper analyzes and discusses the possible provenance of the conglomerate of the Dengchangzi formation in the Niuyingzi-Guojiadian basin, and points out that the source region of the Niuyingzi-Guojiadian basin is the west side of the basin. Finally, the complicated deformation history of two near-vertical faults in the central part of the basin (Dazizi fault and Zhuzangzi fault) has been determined: in the late Triassic, the Proterozoic strata thrust south to east on the Dengzhuzi formation. As a result of the tectonic action again, the Niuyingzi-Guojiadian basin is a residual basin, not a prototype basin, which has undergone a strong tectonic transformation and erosion in the later stage.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P548

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