本文選題：郯廬斷裂帶 + 張八嶺群　； 參考：《合肥工業(yè)大學》2016年博士論文

【摘要】：中國東部巨型的郯廬斷裂帶左行錯開大別-蘇魯造山帶達400 km,但是其南端又截然中止在大別造山帶東南角,顯示其具有特殊的起源方式,但這方面長期以來存在著不同的認識。本次工作通過LA-ICP-MS鋯石U-Pb定年,分別獲得張八嶺隆起北段、廬江地區(qū)和大別造山帶東緣張八嶺群原巖年齡分別為754-753Ma、751-749Ma和751-748 Ma,而肥東雜巖原巖時代為802-754 Ma。這些定年結(jié)果表明,郯廬斷裂帶南段沿線張八嶺群與肥東雜巖內(nèi)的正變質(zhì)巖原巖是揚子板塊新元古代中期巖漿活動的產(chǎn)物,張八嶺群屬于揚子板塊早階段蓋層,而不是過去認為的變質(zhì)基底。通過本次詳細的研究發(fā)現(xiàn),郯廬斷裂帶南段造山期構(gòu)造目前保存在大別造山帶東緣至廬江地區(qū)的張八嶺群內(nèi),以韌性走滑剪切帶形式存在。大別造山帶東緣郯廬韌性剪切帶經(jīng)歷了兩期變形事件。早期變形(D1)表現(xiàn)為北東走向左行走滑韌性剪切帶。顯微觀察顯示,這些剪切帶糜棱巖內(nèi)石英呈現(xiàn)為嵌入式或亞顆粒旋轉(zhuǎn)型重結(jié)晶,而長石表現(xiàn)為顯微破裂或塑性拉長。石英C軸組構(gòu)顯示以底面＜a＞滑移為主,含少量柱面＜a滑移組分。這些顯微構(gòu)造特征指示早期韌性剪切帶的變形溫度為350-400-C。該走滑韌性剪切帶被廣泛疊加了晚期變形(D2),呈現(xiàn)為NE-SW向的緊閉褶皺及上盤向南東的逆沖斷層。本次白云母40Ar/39Ar定年獲得大別東緣早期(D1)韌性剪切帶變形年齡為236-230 Ma(中-晚三疊世),而晚期變形(D2)時間為225-217 Ma(晚三疊世中晚期)。通過對宿松雜巖與襄樊-廣濟剪切帶白云母40Ar/39Ar定年,表明大別造山帶折返時間為230-209 Ma(晚三疊世中晚期)。因此,大別造山帶東緣郯廬左行走滑活動(D1)發(fā)生在造山帶深俯沖階段,而其所疊加的縮短變形(D2)是大別造山帶向南東折返的推擠結(jié)果。廬江地區(qū)郯廬韌性剪切帶也呈NE-SW走向,具有向南東陡傾的剪切帶面理,而礦物拉伸線理近水平,顯示為左旋剪切運動。剪切帶糜棱巖石英以嵌入式(BLG)及亞顆粒旋轉(zhuǎn)型(SR)重結(jié)晶為主,長石表現(xiàn)為顯微破裂或塑性拉長。石英C軸組顯示以底面＜a滑移為主,含極少量柱面＜a滑移組分。這些顯微構(gòu)造特征指示剪切帶的變形溫度為350-400℃。前人白云母40Ar/39Ar定年結(jié)果為239 Ma,因此,廬江地區(qū)郯廬剪切帶左行走滑時代也為中三疊世。張八嶺隆起北段張八嶺群及上覆下震旦統(tǒng)表現(xiàn)為上盤向南南西運動的、平緩的韌性滑脫變形帶。其中的剪切帶糜棱巖內(nèi),石英以嵌入式及亞顆粒旋轉(zhuǎn)型重結(jié)晶為主,長石表現(xiàn)為顯微破裂或塑性拉長,也指示了低綠片巖變形環(huán)境。前人白云母40Ar/39Ar定年結(jié)果表明變形時間為245-236 Ma(中三疊世),與造山期郯廬剪切帶走滑活動同時。張八嶺隆起南段肥東雜巖被廣泛疊加了晚侏羅世郯廬剪切帶左行走滑變形,但其南部仍可識別出早期變形構(gòu)造,現(xiàn)今表現(xiàn)為NEE-NE向的寬緩褶皺。推測其印支期變形組構(gòu)與北部張八嶺群一致,也為平緩的韌性滑脫帶。揚子板塊前陸褶斷帶受郯廬斷裂帶造山期左行走滑的影響發(fā)生了顯著的牽引彎曲,其褶皺樞紐及逆沖斷層走向在遠離郯廬斷裂帶的區(qū)域呈NEE-SWW走向,而在靠近郯廬斷裂帶的區(qū)域表現(xiàn)為向郯廬斷裂帶方向的明顯偏轉(zhuǎn)。華北板塊前陸構(gòu)造在郯廬斷裂帶旁并沒有發(fā)生明顯的牽引彎曲,顯示華北板塊較揚子板塊更為剛硬,具有較強的抵抗變形能力�；谝陨戏治�,我們提出了郯廬斷裂帶起源的板片撕裂模式。我們認為現(xiàn)今華北板塊南緣的邊界輪廓應(yīng)代表了其印支期原始的邊緣形狀,在大別造山帶區(qū)域呈現(xiàn)向南的突出。在華北與揚子板塊之間大洋巖石圈俯沖過程中,沿華北板塊嵌入體東緣形成大洋撕裂斷層。當印支期華北與揚子兩大陸首先沿大別造山帶發(fā)生陸—陸碰撞時,大洋撕裂斷層擴展到被動的揚子大陸內(nèi)部。在此嵌入式碰撞與揚子板塊撕裂過程中,大別造山帶之下的揚子板塊以低角度向北長距離俯沖,同時嵌入體東側(cè)揚子板塊沿撕裂斷層繼續(xù)向北水平運動,出現(xiàn)了郯廬斷裂帶同造山期的左行走滑活動,直至蘇魯造山帶處與華北板塊碰撞。隨后至晚三疊世中晚期,隨著大洋板片的斷離,大別造山帶內(nèi)部深俯沖陸殼發(fā)生了向南東的折返,造成了大別造山帶東緣郯廬走滑韌性剪切帶強烈的擠壓褶皺作用。
[Abstract]:The giant Tan Lu fault zone in eastern China has left the Dabie Su Lu orogenic belt up to 400 km, but the southern end of the Tanlu fault zone was suspended in the southeastern corner of the Dabie orogenic belt, showing its special origin, but it has been different in this respect for a long time. This work obtained the north of the Zhang eight ridge uplift through the LA-ICP-MS zircon U-Pb dating. The original rock age of the Zhang eight Ling group in the eastern margin of the Lujiang and Dabie orogenic belts is 754-753Ma, 751-749Ma and 751-748 Ma, while the original rock age of the Feidong complex is 802-754 Ma., which indicates that the normal metamorphic rocks in the Zhang eight Ling group and the Feidong complex along the southern Tan Lu fault zone are the middle Neoproterozoic magmatism of the Yangzi plate. The Zhang eight Ling group belongs to the early stage of the Yangtze plate, not the metamorphic basement that was considered in the past. Through this detailed study, it is found that the southern segment of the Tanlu fault zone is currently preserved in the Zhang eight ridge group of the Dabie orogenic belt to the Lujiang area, and exists in the form of the ductile strike slip shear zone. The sexual shear zone has undergone two phases of deformation. The early deformation (D1) is shown as the north-east strike slip ductile shear zone. The microscopic observation shows that the quartz in the mylonite of these shear bands is characterized by embedded or subgranular rotating recrystallization, while the feldspar is characterized by microrupture or plastic elongating. The quartz C axis fabric shows the bottom surface < a > slip These microstructural characteristics indicate that the deformation temperature of the early ductile shear zone is 350-400-C., and the early ductile shear zone is widely superimposed on the late deformation (D2), which presents the closed fold of NE-SW direction and the reverse thrust fault of the South East of the South East. This Muscovite 40Ar/39Ar has obtained the early Dabie early Eastern Margin (D1) for this time. The deformation age of the ductile shear zone is 236-230 Ma (mid - late three fold), while late deformation (D2) time is 225-217 Ma (late late three). Through the year of 40Ar/39Ar dating of the Susong complex and the Xiangfan Guangji shear zone, the reentry time of the Dabie orogenic belt is 230-209 Ma (late three late superposition). Therefore, the Tanlu left of the Dabie orogenic belt is in the eastern margin of the Dabie orogenic belt. The movement of D1 occurs in the deep subduction stage of the orogenic belt, and its superimposed shortening deformation (D2) is the result of the reentry of the Dabie orogenic belt to the South East. The Tan Lu ductile shear zone in the Lujiang area also shows the direction of the shear zone with a steep dip in the South and the East, while the mineral extension line is near the horizontal, showing a left-handed shear movement. Prism quartz is dominated by embedded (BLG) and subgranular rotating (SR) recrystallization, and feldspar is characterized by microrupture or plastic elongating. The quartz C axis group shows the main bottom surface < a slip and a very small number of cylinder a slip components. These microstructure features indicate that the deformation temperature of the shear zone is 350-400 C. The 40Ar/39Ar dating results of the former Muscovite 239 Ma, therefore, the Tan Lu shear zone in the Lujiang area is also the middle three fold era. The Zhang eight Ling group and the overlying Sinian in the northern part of the Zhang eight ridge uplift are shown to the South and South West movement of the upper plate and the gentle ductile deformable belt. The deformation environment of the low green schist is indicated by the microscopic rupture or plastic elongating. The 40Ar/39Ar dating results of the former Muscovite showed that the deformation time was 245-236 Ma (middle three fold), and the Tanlu shear belt slipping in the orogenic period. The Feidong complex in the southern part of the Zhang eight ridge uplift was widely superimposed on the left walking and sliding deformation of the Tan Lu shear zone in the late Jurassic. The early deformation structure in the South still can be identified as a wide and gentle fold of NEE-NE direction. It is presumed that the Indosinian deformation fabric is the same as the northern Zhang eight Ling group, and also a gentle ductile detachment zone. The thrust fault trend is NEE-SWW in the area far away from the Tanlu fault zone, while the area near the Tan Lu fault zone shows a clear deflection to the direction of the Tanlu fault zone. The North China plate foreland structure has no obvious traction bending beside the Tanlu fault zone, showing that the North China plate is more rigid than the Yangtze plate and has strong resistance. Based on the above analysis, we put forward a plate tear model of the origin of the Tanlu fault zone. We think that the boundary outline of the southern margin of the North China plate should represent the original edge shape of its Indosinian period and present a southward protruding in the Dabie orogenic zone. The eastern margin of the North China plate formed an oceanic tearing fault. When the two continent of North China and the Yangtze were first collided along the Dabie orogenic belt, the ocean tear fault extended to the passive Yangtze continent. In this embedded collision and the tearing of the Yangtze plate, the Yangtze plate under the Dabie orogenic belt was northward to the north. Long distance subduction, at the same time, the Yangtze plate on the east side of the embedded body continues to move northward along the tearing fault, and the Tan Lu fault zone has the same left strike slip movement with the orogenic period until the Su Lu orogenic belt collided with the North China plate. Then, at the end of the late three fold, the deep subducted continental crust of the Dabie orogenic belt occurred along with the breakage of the oceanic plates. The exhumation to South East resulted in a strong compression fold in the Tan Lu strike slip ductile shear zone along the eastern margin of the Dabie orogenic belt.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：P542

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