本文關(guān)鍵詞：華南巖石圈三維電性結(jié)構(gòu)及構(gòu)造意義　出處：《吉林大學》2017年博士論文　論文類型：學位論文

  更多相關(guān)文章： 華南地區(qū) 大地電磁測深 阻抗張量分解 三維反演 巖石圈

【摘要】：華南大陸位于歐亞板塊的東南部,處在全球現(xiàn)今三大重要板塊——歐亞板塊、太平洋板塊與印度板塊的匯聚拼合部位,是中國大陸及全球構(gòu)造的重要組成部分,因此,建立華南大陸高精度三維結(jié)構(gòu)模型具有重要的研究意義。論文依托國家專項“深部探測技術(shù)與實驗研究”,圍繞華南大陸巖石圈結(jié)構(gòu)與構(gòu)造問題開展研究,首次獲得華南地區(qū)三維長周期大地電磁探測數(shù)據(jù)研究結(jié)果,基于獲得的三維巖石圈電性結(jié)構(gòu)模型對華南大陸的深部結(jié)構(gòu)與狀態(tài)進行系統(tǒng)剖析。通過對原始時間序列進行傅里葉變換、Robust估計、遠參考、功率譜挑選等處理得到全部測點的大地電磁阻抗張量數(shù)據(jù),經(jīng)篩選獲得385個高質(zhì)量的大地電磁測深點。采用相位張量分解對維性信息進行分析,認為研究區(qū)整體二維性較好,僅局部及深部存在較強三維性。采用GB多頻多測點分解法獲得區(qū)域阻抗及電性主軸分布,分測線進行主軸統(tǒng)計,確定了研究區(qū)優(yōu)勢構(gòu)造走向為NE向。采用感應(yīng)矢量分析對高阻體高導體的平面特征進行定性分析,發(fā)現(xiàn)研究區(qū)深部可能存在線性分布的高導異常。應(yīng)用Rhoplus分析對視電阻率和阻抗相位進行分析校正,并參照地質(zhì)構(gòu)造及視電阻率趨勢對靜態(tài)效應(yīng)進行進一步評估。采用有效視電阻率進行一維正則化反演,獲得了研究區(qū)巖石圈厚度分布。將各測線區(qū)域阻抗數(shù)據(jù)按照各自主軸方位角進行旋轉(zhuǎn),采用4種數(shù)據(jù)組合進行二維非線性共軛梯度反演。選用L曲線法確定最佳正則化因子,對不同數(shù)據(jù)組合的擬合情況進行評價。三維反演選用338個測點的全阻抗數(shù)據(jù),在Tremissis數(shù)據(jù)平臺上進行數(shù)據(jù)處理及模型構(gòu)建,采用ModEM程序包進行三維反演,獲得研究區(qū)巖石圈尺度的三維電性結(jié)構(gòu)。對比二維三維反演結(jié)果,在電性特征上,東南沿海巖漿巖帶反演結(jié)果一致,而華夏褶皺帶與江南造山帶差異較大。分析發(fā)現(xiàn)由于二維反演數(shù)據(jù)嚴重依賴于構(gòu)造走向的確定,而華南地區(qū)復雜的地質(zhì)構(gòu)造使得這一分析結(jié)果存在較大不確定性,利用三維反演結(jié)果進行解釋研究具有更大的合理性。研究區(qū)三維電性結(jié)構(gòu)呈現(xiàn)縱向分層與橫向分塊特征,采用縱向圈層分析與橫向地塊分析相結(jié)合的手段對華南地區(qū)的電性結(jié)構(gòu)進行綜合研究。地殼整體以高阻特征為主,結(jié)構(gòu)較為復雜。上地殼的電阻率分布格局反映了盆地深部與前寒武紀基底的耦合,下地殼電阻率的分布格局反映了新生麻粒巖相下地殼與古老地殼的組合。巖石圈地幔呈現(xiàn)明顯的分區(qū)特征,揚子地塊東緣江南造山帶存在高阻體R1;華夏褶皺帶存在高阻體R2、R3,其中R3越過上虞-政和-大浦斷裂延伸入東南沿海巖漿巖帶南段,高阻體R1、R2、R3通過線性延伸的低阻體C1、C2、C3銜接;東南沿海巖漿巖帶北段存在低阻體C4,南北段為閩江斷裂C5所分隔。根據(jù)巖石圈地幔的電阻率分布格局建立巖石圈尺度的構(gòu)造框架。結(jié)合電性結(jié)構(gòu)分析,研究了深大斷裂的深部展布特征,討論了華夏與揚子地塊的接觸關(guān)系。兩大地塊以東傾江紹斷裂為界,華夏地塊淺層向北西逆沖推覆,揚子在深部向華夏地塊擠入。根據(jù)巖石圈厚度特征將華南地區(qū)巖石圈分為弱減薄型碎塊巖石圈(Ⅰ型)和強減薄型的線性巖石圈(Ⅱ型)。弱減薄型碎塊巖石圈厚度為130~150km,強減薄型線性巖石圈的厚度在80km左右。結(jié)合地幔捕擄體證據(jù),對不同類型巖石圈地幔的物質(zhì)結(jié)構(gòu)進行分析,推測華南地區(qū)存在貧水、難熔的古老巖石圈地幔(Ⅰ型)和相對富水、新生的巖石圈地幔(Ⅱ型)。在物質(zhì)結(jié)構(gòu)基礎(chǔ)上對上地幔熱狀態(tài)進行了大地熱流對應(yīng)分析,并根據(jù)高導區(qū)位置圈定了上地幔高熱區(qū)域。
[Abstract]:Southern China, located in the southeastern part of the Eurasian plate in the world today, the three major sectors together spliced position of the Eurasian plate, the Pacific plate and India plate, is an important part of China, and global tectonics therefore, the establishment of Southern China, the high precision three-dimensional structure has important significance of constitutive model. Based on the national project "deep exploration technology and experimental research", focuses on the problems of Southern China continental lithosphere structure and tectonics, the first data research results in Southern China three long period magnetotelluric sounding, the 3D lithospheric electrical structure model of Southern China, the deep structure and based on system analysis. Through the processing of Fourier transform, Robust estimation, remote reference and power spectrum selection, we get the magnetotelluric impedance tensor data of all the measured points, and get 385 high-quality magnetotelluric sounding points. The phase tensor decomposition (phase tensor decomposition) is used to analyze the dimension of the information. It is considered that the overall two-dimensional character of the study area is better, but only the local and deep parts have strong three-dimensional character. The GB multi frequency and multi test point decomposition method is used to obtain the distribution of the main axis of the impedance and electrical properties of the region. The main shaft statistics are carried out by the measuring line, and the dominant structure of the study area is NE direction. The induction vector analysis is used to qualitatively analyze the plane characteristics of high resistance high conductor. It is found that there may be a high conductivity anomaly in the deep part of the study area. The Rhoplus analysis is used to analyze and correct the apparent resistivity and impedance phase, and the static effect is further evaluated according to the geological structure and the trend of apparent resistivity. The thickness distribution of the lithosphere in the study area is obtained by using the effective apparent resistivity for one dimensional regularization inversion. The impedance data of each line area are rotated according to the azimuth of each axis, and the two dimensional nonlinear conjugate gradient inversion is carried out by 4 kinds of data combinations. The L curve method was used to determine the best regularization factor, and the fitting of different data combinations was evaluated. Three dimensional inversion is based on 338 impedance data. The data processing and model building are carried out on the Tremissis data platform. The three-dimensional electrical structure of the lithospheric scale in the study area is obtained by using ModEM package for 3D inversion. Compared with the results of two-dimensional three-dimensional inversion, the inversion results of the magmatic rocks in the southeast coastal areas are consistent in the electrical characteristics, but the difference between the Huaxia fold belt and the Jiangnan orogenic belt is great. It is found that the two-dimensional inversion data is heavily dependent on the determination of the structural trend. The complicated geological structure in Southern China area makes the analysis result uncertain. The three-dimensional electrical structure in the study area is vertically stratified and laterally partitioned. The electrical structure of Southern China area is comprehensively studied by means of the combination of vertical circle analysis and transverse plot analysis. The whole crust is characterized by high resistance, and the structure is more complex. The resistivity distribution pattern of the upper crust reflects the coupling between the deep part of the basin and the Precambrian basement. The distribution pattern of the resistivity of the lower crust reflects the combination of the new granulite facies and the lower crust with the ancient crust. The lithospheric mantle show the partition characteristics of the Yangtze block of eastern margin of the Jiangnan orogenic belt has the high resistance body R1; China fold belt of existing high resistivity body R2, R3, R3 - across Shangyu Zhenghe Dapu fault extends into the southeast coast of Southern magmatite belt, high resistance R1, R2, R3 by linear extension of the low C1, C2, C3 resistance and cohesion; southeast coastal magmatite belt of low resistance C4, separated by the North-South Minjiang fault C5. The tectonic framework of the lithosphere scale is established according to the distribution pattern of the resistivity of the lithosphere mantle. Combined with the electrical structure analysis, the deep distribution characteristics of the deep fault are studied, and the contact relationship between the Huaxia and the Yangtze block is discussed. The two major blocks are bound to the east of the JIANGSHAO fault, and the shallow layer of the Huaxia block is thrust into the northwestern thrust, and the Yangtze is squeezed into the Huaxia massif in the deep. The lithosphere in Southern China area is divided into weakly reduced lithospheric lithosphere (type I) and strongly reduced linear lithosphere (type II) according to the thickness of the lithosphere. The thickness of the weakly reduced lithosphere is 130~150km, and the thickness of the strongly thinned linear lithosphere is about 80km. Combined with the evidence of mantle traps, we analyzed the material structure of different types of lithospheric mantle, and concluded that there are water poor and refractory ancient lithospheric mantle (type I) and relatively water rich and new lithospheric mantle (type II) in Southern China area. The thermal state of the upper mantle is analyzed on the basis of the material structure, and the upper mantle high heat region is delineated according to the position of the high guide area.
【學位授予單位】：吉林大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：P631.325

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