本文關(guān)鍵詞： 碧口地塊 逆沖推覆構(gòu)造 變形期次 邊界斷裂　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：碧口地塊位于青藏高原東北緣、龍門(mén)山逆沖構(gòu)造帶北段,西秦嶺造山帶、松潘-甘孜造山帶和揚(yáng)子板塊匯聚部位。碧口地塊呈楔形形態(tài),軸向NEE向,北側(cè)以近E-W向勉略縫合帶為界與西秦嶺造山帶相隔,西側(cè)以近S-N向虎牙斷層為界與松潘-甘孜造山帶相鄰,南側(cè)以近NEE向青川-平武斷層為界與龍門(mén)山構(gòu)造帶相隔,東側(cè)在青川-平武斷層與勉略縫合帶漸變交匯處呈楔形構(gòu)造尖滅。前人曾長(zhǎng)期將碧口地塊作為龍門(mén)山逆沖構(gòu)造帶北段,認(rèn)為其形成與新生代晚期龍門(mén)山向SE逆沖有關(guān),但近期有關(guān)巖石學(xué)和區(qū)域構(gòu)造的研究表明,其形成可能與晚三疊世南秦嶺前陸逆沖作用和擠出構(gòu)造有關(guān)。造成上述認(rèn)識(shí)分歧的根本原因在于缺少對(duì)碧口地塊及其邊界斷裂的構(gòu)造樣式和運(yùn)動(dòng)學(xué)的系統(tǒng)性解析。本文在前人研究的基礎(chǔ)上,對(duì)碧口地塊逆沖推覆構(gòu)造結(jié)構(gòu)與運(yùn)動(dòng)學(xué)進(jìn)行研究,并且厘定了三期構(gòu)造變形。D1期是向S的逆沖推覆,以發(fā)育間隔劈理(S1),線理構(gòu)造(L1),中等緊閉褶皺(f1)和活動(dòng)斷層(F1)為特征,大多被后期構(gòu)造疊加;D1期變形發(fā)生在中-晚三疊世,與印支期華北和華南板塊的碰撞有關(guān)。D2期是向SSE的正向剪切,以發(fā)育有區(qū)域性透入性劈理(S2),礦物線理(L2),平臥褶皺(f2),以及拆離斷層(F2),不同尺度的韌性變形為特征,透入性面理S2∥S0,指示了順層剪切作用;D2期伸展作用發(fā)生在早-中侏羅世,與印支造山后期區(qū)域上的伸展作用有關(guān)。D3期變形是向SE的逆沖和走滑作用,以發(fā)育有間隔劈理(S3),線理構(gòu)造(L3),褶皺(f3)和逆沖斷層(F3)為特征。D3期變形存在三個(gè)不同的階段:第一階段是沿青川-平武斷層向SE的活化逆沖推覆作用,發(fā)生在晚侏羅世-早白堊世;第二階段逆沖推覆作用減弱,沿青川-平武斷層發(fā)生左行走滑作用,碧口地塊沿虎牙斷層向西逆沖推覆,發(fā)生在晚白堊世-漸新世;第三階段走滑方向反轉(zhuǎn)為右行走滑,主要體現(xiàn)在青川-平武斷層對(duì)現(xiàn)今水系和地貌的改造,此階段自中新世開(kāi)始并持續(xù)至今;D3期變形與青藏高原隆升有關(guān)。青川-平武斷層與虎牙斷層在不同變形期有不同的構(gòu)造屬性,D1期青川-平武斷層作為主逆沖斷層,沿其發(fā)生逆沖推覆作用,虎牙斷層還未形成,或僅發(fā)育張性破裂面;D3期時(shí)青川-平武斷層早期具有逆沖斷層性質(zhì),后期表現(xiàn)為走滑斷層性質(zhì),虎牙斷層早期具有走滑斷層性質(zhì),晚期具有逆沖斷層性質(zhì)。
[Abstract]:The Bikou block is located in the northeast margin of the Qinghai-Xizang Plateau, the northern section of the Longmenshan thrust tectonic belt, the West Qinling orogenic belt, the Songpan-Ganzi orogenic belt and the converging site of the Yangtze plate. The northern side is separated from the west Qinling orogenic belt by the near E-W direction Mianluo suture belt, the west side by the near S-N direction Tiger tooth fault as the boundary and the Songpan-Ganzi orogenic belt as the boundary, the south side by the near NEE direction Qingchuan-Pingwu fault boundary and the Longmenshan tectonic belt, the south side is separated from the Longmenshan tectonic belt by the near NEE direction Qingchuan-Pingwu fault boundary. The east side of Qingchuan-Pingwu fault and Mianliao suture zone is wedge-shaped structural pinnacle. The Pikou block was regarded as the northern segment of Longmenshan thrust belt for a long time, and its formation is related to the SE thrust in the late Cenozoic Longmen Mountain. But recent studies on petrology and regional tectonics suggest that. Its formation may be related to the late Triassic Foreland thrust and extrusion tectonics in the South Qinling Mountains. The fundamental reason for the above differences lies in the lack of systematic analysis of the tectonic style and kinematics of the Bikou Block and its boundary faults. On the basis of previous studies, The tectonic structure and kinematics of thrust nappe in Bikou block have been studied, and it has been determined that the three tectonic deformations. D1 are thrusting nappe to S, characterized by the development of interval cleavage (S1), linear tectonics (L1), moderately closed fold (f1) and active fault (F1). Most of the deformation occurred in the Middle-Late Triassic by the late tectonic superimposition of D 1, which is related to the collision of the North and South China plates in the Indosinian period. The D 2 period is a positive shear to SSE. It is characterized by the development of regional permeable cleavage (S _ 2), mineral cleavage (L _ 2), horizontal fold (F _ 2), and ductile deformation at different scales (S _ 2 / S _ 0), indicating that the extension of the D _ 2 stage occurred in the early and middle Jurassic. The deformation of phase D3 is related to the extension in the late Indosinian orogenic region, and the thrust and strike-slip to SE are involved in the deformation. There are three different stages in the deformation of stage D _ 3, characterized by the development of spaced cleavage S3, linear tectonics, L3, fold f3) and thrust fault F3. The first stage is the active thrust nappe along the direction of Qingchuan-Pingwu fault, the first stage is the active thrust nappe along the Qingchuan-Pingwu fault. It occurred in late Jurassic-early Cretaceous, the second stage of thrusting nappe weakened, along Qingchuan-Pingwu fault occurred left strike-slip, the Bikou block thrust west along the Tianyao fault, occurred in the late Cretaceous to Oligocene; In the third stage, the direction of strike-slip is reversed to right-strike-slip, which is mainly reflected in the transformation of the present drainage system and geomorphology by the Qingchuan-Pingwu fault. The deformation of Qingchuan Pingwu fault and Huya fault have different tectonic attributes in different deformation periods. Qingchuan Pingwu fault in D1 period is the main thrust fault, and Qingchuan-Pingwu fault is related to the uplift of the Qingchuan plateau since the Miocene epoch, which is related to the uplift of Qinghai-Xizang Plateau. Along the thrusting nappe, the Tiger tooth fault has not been formed, or the Qingchuan-Pingwu fault has the character of thrust fault in the early stage of tensional fracture plane D 3, and the strike-slip fault in the later period, and the strike-slip fault in the early stage of the Tiger tooth fault, and the fault has the character of strike-slip fault in the early stage of the Tiangyao fault. The late stage has the property of thrust fault.
【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)】：P542

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