【摘要】：本文主要研究川滇地區(qū)不同構(gòu)造塊體的殼幔過渡帶,川滇地區(qū)地處青藏高原東南緣,是研究高原物質(zhì)側(cè)向逃逸的關(guān)鍵地區(qū),開展殼幔過渡帶結(jié)構(gòu)特征研究,可為揭示研究區(qū)的構(gòu)造演化提供地震學(xué)證據(jù)。本文詳細(xì)研究了遠(yuǎn)震接收函數(shù)Pms轉(zhuǎn)換波所攜帶的臺站下方殼幔過渡帶精細(xì)結(jié)構(gòu)的分頻特征,波形特征所對應(yīng)的殼幔過渡帶結(jié)構(gòu)類型,利用顯示出不同殼幔過渡帶結(jié)構(gòu)類型的特征頻率計(jì)算其厚度范圍的方法。利用震源位置相近的地震記錄,提取川滇地區(qū)各臺站的不同高斯系數(shù)的接收函數(shù),利用接收函數(shù)中的,來得到殼幔過渡帶厚度以及殼幔過渡帶速度結(jié)構(gòu),殼幔邊界的精細(xì)結(jié)構(gòu),利用固定地震臺站記錄的遠(yuǎn)震波形數(shù)據(jù),采用接收函數(shù)Ps轉(zhuǎn)換波的分頻特征和H-k方法,對研究區(qū)不同塊體的殼幔過渡帶結(jié)構(gòu)進(jìn)行了研究,取得了如下主要成果:1.穩(wěn)定的揚(yáng)子塊體下方殼幔過渡帶比較簡單,主要由一階間斷面組成,其厚度介0.86km--1.44km之間,揚(yáng)子塊體的殼幔過渡帶表現(xiàn)為一階間斷面,反映其構(gòu)造穩(wěn)定;2.南北松潘甘孜地區(qū)的殼幔過渡帶為高低速相間結(jié)構(gòu),其過渡帶厚度為1.8km--3.4km,松潘甘孜地區(qū)的殼幔過渡帶為高、低速相間結(jié)構(gòu),暗示構(gòu)造活動強(qiáng)烈;3.保山和蘭坪塊體地幔過渡帶則表現(xiàn)為速度漸變結(jié)構(gòu),其過渡帶厚度為1.1-3.6km,保山和蘭坪塊體的殼幔過渡帶以速度漸變結(jié)構(gòu)為主要特征,其活動性弱于松潘甘孜地區(qū)。由于川滇地區(qū)地處青藏高原東南緣,是高原物質(zhì)逃逸的主要地區(qū),青藏高原的不斷隆升,使得川滇地區(qū)各塊體構(gòu)造強(qiáng)烈,結(jié)構(gòu)復(fù)雜。根據(jù)本文的研究結(jié)果,可以發(fā)現(xiàn)靠近青藏高原的南北松潘甘孜地塊活動性較為強(qiáng)烈,遠(yuǎn)離青藏高原的保山蘭坪地塊活動性則明顯弱于松潘甘孜地區(qū),而穩(wěn)定的揚(yáng)子板塊巖石圈相當(dāng)堅(jiān)硬,構(gòu)造穩(wěn)定。
[Abstract]:This paper mainly studies the crust-mantle transition zone of different tectonic blocks in Sichuan-Yunnan area, which is located in the southeast margin of the Qinghai-Tibet Plateau and is the key area to study the lateral escape of the plateau material. The structural characteristics of the crust-mantle transitional zone have been studied. It can provide seismological evidence for revealing the tectonic evolution of the study area. In this paper, the frequency division characteristics of the fine structure of the crust-mantle transition zone under the station carried by the Pms transform wave of the remote seismic reception function and the structural types of the crust-mantle transition zone corresponding to the waveform characteristics are studied in detail. The method of calculating the thickness range of the transition zone by using the characteristic frequency which shows the structural types of different crust-mantle transition zones. The reception function of different Gao Si coefficients of stations in Sichuan-Yunnan region is extracted by using the seismic records with similar focal positions. The thickness of the crust-mantle transition zone, the velocity structure of the crust-mantle transition zone and the fine structure of the crust-mantle boundary are obtained by using the reception function. Using the data of remote seismic waveforms recorded by fixed seismic stations, the structure of crust-mantle transition zones of different blocks in the study area is studied by using the frequency-division characteristics of the received function Ps converted waves and H-k method. The main results are as follows: 1. The stable crust-mantle transition zone under the Yangtze block is relatively simple and is mainly composed of a first-order intersecting section. The crust and mantle transition zone of the Yangtze block is characterized by a first-order discontinuity surface between its thickness and 0.86km--1.44km, reflecting the structural stability of the Yangtze block. The crust-mantle transitional zone in Songpan Ganzi area is of a high and low velocity interphase structure with a thickness of 1.8 km-3.4 km. The crust mantle transitional zone in Songpan-Ganzi area is characterized by a high and low velocity interphase structure, implying a strong tectonic activity. The mantle transition zone of Baoshan and Lanping blocks shows a velocity gradient structure with a thickness of 1.1-3.6km. the crust-mantle transition zone of Baoshan and Lanping blocks is mainly characterized by velocity gradient structure, and its activity is weaker than that of Songpan Ganzi area. The Sichuan-Yunnan region is located in the southeast margin of the Qinghai-Xizang Plateau and is the main region where the material escapes from the plateau. The continuous uplift of the Qinghai-Tibet Plateau makes the blocks in the Sichuan-Yunnan region strong in structure and complex in structure. Based on the results of this study, it can be found that the activity of the Songpan-Ganzi block near the Qinghai-Tibet Plateau is relatively strong, while the activity of the Baoshan Lanping block far from the Qinghai-Tibet Plateau is obviously weaker than that of the Songpan-Ganzi area. The stable Yangtze plate lithosphere is rather hard and structurally stable.
【學(xué)位授予單位】：中國地震局地球物理研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P315.2

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