本文關(guān)鍵詞： 昌平-懷柔地區(qū) 中生代 疊加變形　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：北京昌平-懷柔一帶位于燕山造山帶西段,區(qū)內(nèi)發(fā)育強(qiáng)烈的構(gòu)造變形和廣泛的巖漿活動,前人對中生代時期NE向構(gòu)造形跡研究較多,對其它方向的構(gòu)造形跡關(guān)注較少,而對它們之間的疊加改造關(guān)系的研究更顯不足,因此導(dǎo)致對該區(qū)中生代構(gòu)造演化過程的認(rèn)識存在欠缺。本研究通過野外觀測和室內(nèi)分析,厘定了研究區(qū)內(nèi)不同方向收縮構(gòu)造變形的幾何學(xué)和運動學(xué)特征,結(jié)合不同構(gòu)造形跡之間的交切關(guān)系,及其與相關(guān)巖體、火山巖地層之間的侵入和覆蓋關(guān)系,以及基于斷層滑動數(shù)據(jù)的古應(yīng)力狀態(tài)反演,對各類構(gòu)造變形進(jìn)行了分期配套,并分析了它們相互疊加和改造的演化過程。NW向收縮構(gòu)造變形主要表現(xiàn)為一系列寬緩的褶皺,如鐵礦峪背斜和黃巖山背斜,卷入褶皺的最新地層為奧陶系,髫髻山組火山巖(161-153 Ma)不整合覆蓋其上,該期收縮構(gòu)造變形時限在161 Ma之前,后期被NE向逆沖斷層和巖體改造,平面圖上的NW向褶皺軸跡和露頭上NW向小型褶皺的樞紐發(fā)生彎曲變形。NE向收縮構(gòu)造變形最為強(qiáng)烈,并可分為兩期,早期主要發(fā)育NE向褶皺,如黃花城背斜和上莊西南側(cè)NE向背向斜,發(fā)育在長城系、薊縣系、寒武系和奧陶系中,疊加在NW向褶皺之上;后期主要發(fā)育NE向逆沖斷層及其上下盤伴生褶皺,如十三陵-上莊-紅螺寺逆沖斷層和大片-鐵礦峪逆沖斷層,逆沖方向總體指向NW,局部指向NNW,逆沖斷層使早期形成的NE向褶皺的局部形態(tài)變的緊閉,十三陵-上莊-紅螺寺逆沖斷層被薛家石梁巖體(130 Ma)截切,NE向收縮構(gòu)造變形時限在130 Ma之前。NNW向收縮構(gòu)造,主要表現(xiàn)為若干褶皺,如百合村東側(cè)的褶皺和軍都山背斜,該期褶皺發(fā)育在霧迷山組和髫髻山組地層中,百合村褶皺具有指向SWW的運動學(xué)極性,NNW向的褶皺疊加在NE向的十三陵-上莊-紅螺寺逆沖斷層和薛家石梁巖體之上,該期收縮構(gòu)造變形時限為130Ma之后。本次研究根據(jù)野外觀測到的各期構(gòu)造變形的疊加關(guān)系和區(qū)域資料厘定了研究區(qū)中生代各期構(gòu)造變形的時限。研究區(qū)NW向褶皺構(gòu)造變形可能與蒙古-鄂霍茨克板塊的俯沖碰撞相關(guān),NNW向收縮構(gòu)造的運動學(xué)極性指示該期變形的動力來自研究區(qū)東側(cè)。
[Abstract]:Beijing Changping - Huairou area is located in the Yanshan orogenic belt, tectonic zone developed strong deformation and extensive magmatism, the predecessor to the Mesozoic era to the structural features of NE, on the other direction of the structural features of less attention, and the study on the superimposed relationship between them more insufficient, thus leading to the existence of a lack of understanding the process of Mesozoic tectonic evolution in this area. Through the analysis of the field observation and indoor, determining the geometry and kinematics characteristics of the study area in different direction of contraction of tectonic deformation, combination between different structural relationships of rock mass and rock strata, between volcano intrusive and covering relations, as well as based on fault slip data the stress state of inversion, the tectonic deformation of staging facilities, and analyzes the evolution of.NW and their mutual superposition and transformation to shrink structure Deformation is mainly a series of broad and gentle fold, such as iron ore and Huangyan Valley anticline anticline, the new strata is involved in Ordovician, volcano rock group in Jishan (161-153 Ma) unconformity on the deformation time at 161 Ma before the period of tectonic contraction, the latter being NE to thrust fault and rock transformation plan NW to fold axis and NW to the small outcrop on the folds of the hub bending deformation.NE to shrink deformation most strongly, and can be divided into two periods, the early development of NE mainly to the fold, such as the Huanghuacheng anticline and the southwest side of the NE cable to support the village, development in the Great Wall, Jixian County, Cambrian and Ordovician, superimposed on the NW trending folds; later developed mainly NE trending thrust faults and footwall associated fold, such as the Ming Dynasty Tombs, Hongluo Temple - - thrust faults and large iron ore - Valley thrust fault, thrust direction of the overall direction NW, pointing to the local NN W, thrust fault in the early formed NE closed to the local form of fold change, Ming Dynasty Tombs - Hongluo Temple shangzhuan thrust by xuejiashiliang rock (130 Ma) cut, NE to contractional deformation to structural contraction duration of.NNW before 130 Ma, mainly for several fold, such as lily of the eastern side of the village and in the mountain fold anticline, the folds are developed in the Wumishan formation and Tiaojishan Formation in Lily village fold with kinematics to the SWW polarity, NNW to the fold in the direction of NE - Ming Dynasty Tombs - Hongluo Temple, thrust fault and xuejiashiliang rock, after the period of contraction deformation time is 130Ma. In this study, according to the different tectonic deformation field observed superimposed relationship and regional data have been identified in the study area the Mesozoic tectonic deformation time. The study area NW to fold deformation may be related to the Mongolia Okhotsk subduction The kinematic polarity of the NNW to the contractile structure indicates that the dynamic force of this period of deformation comes from the east of the research area.

【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P542

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本文編號：1493981