用接收函數(shù)方法研究華南大陸東部地殼上地幔結(jié)構(gòu)
發(fā)布時間：2018-10-19 20:24
【摘要】：華南大陸東部地區(qū)地處歐亞板塊和太平洋板塊的交匯區(qū)域,長期受到印度洋板塊、太平洋板塊和菲律賓海板塊的俯沖影響,是歐亞大陸東部邊緣構(gòu)造框架極其重要的一部分,也是研究板塊相互作用的最佳天然實驗室之一。本文簡要介紹了華南大陸東部地區(qū)的地質(zhì)概況和近年來華南大陸東部地區(qū)地殼上地幔結(jié)構(gòu)的研究成果,采用華南大陸東部贛閩地區(qū)35臺三分量寬頻流動臺站于2012年6月至2014年6月期間記錄的遠震數(shù)據(jù),以及贛閩地區(qū)58臺固定臺站于2011年1月至2012年12月期間記錄的遠震數(shù)據(jù),提取了6784條P波接收函數(shù),利用H-κ掃描疊加方法,得到了華南大陸東部贛閩地區(qū)地殼厚度和波速比結(jié)構(gòu)的分布；通過接收函數(shù)的CCP疊加方法得到了華南大陸東部由內(nèi)陸到沿海地區(qū)的莫霍面形態(tài),以及深部410 km和660 km界面的形態(tài),結(jié)合其它地質(zhì)地球物理資料討論了華南大陸東部地區(qū)的地殼及上地幔結(jié)構(gòu)特征,并對其動力學模式進行了初步探討。本文研究表明：(1)華南大陸東部地區(qū)地殼厚度范圍在28—34 km之間,由內(nèi)陸向沿海有起伏的逐漸減薄,江西西北部和沿海地區(qū)地殼較薄,江西東南部和福建西北部地殼較厚。波速比值在1.61—1.83之間,相應的泊松比值在0.21-0.28之間,波速比值(泊松比值)由內(nèi)陸向沿海增加。研究區(qū)地殼主要以中、酸性巖石為主,部分地區(qū)受到地幔物質(zhì)強烈上涌影響,地殼巖石中鎂鐵成分明顯增加從而導致泊松比升高。沿海地區(qū)福州、漳州等地泊松比值較高,可能在深部存在部分熔融(2)沿江西九江—福建寧化剖面走向,地殼的平均波速比值在1.65-1.75之間,相對應的地殼平均泊松比值介于0.21-0.26之間,反映了華南大陸東部內(nèi)陸的泊松比結(jié)構(gòu)。泊松比值顯示,研究區(qū)地殼巖石以長英質(zhì)占優(yōu),表明研究區(qū)地殼結(jié)構(gòu)相對比較穩(wěn)定,殼幔垂向物質(zhì)交換活動較弱。沿萍鄉(xiāng)—廣豐斷裂帶的波速比值明顯高于兩側(cè),其原因可能是受深部殘存新元古代蛇綠混雜巖帶的影響,這個結(jié)果進一步證明了該斷裂是贛北地區(qū)兩塊體的匯聚邊界,為江紹斷裂的自然西延。(3)華南大陸東部地區(qū)上地幔主要速度間斷面4101km和660 km在橫向上未發(fā)現(xiàn)明顯突變或起伏,上地幔轉(zhuǎn)換帶厚度與全球平均值基本一致,暗示了華南大陸東部地區(qū)上地幔轉(zhuǎn)換帶溫度保持正常狀態(tài),表明華南大陸東部地區(qū)的上地幔轉(zhuǎn)換帶未受到歐亞大陸板塊與菲律賓板塊碰撞的明顯影響。
[Abstract]:The eastern part of South China is located in the intersection area of Eurasian plate and Pacific plate, and has long been affected by subduction of the Indian Ocean plate, Pacific plate and Philippine sea plate, which is an extremely important part of the tectonic framework of the eastern margin of Eurasia. It is also one of the best natural laboratories for studying plate interaction. This paper briefly introduces the geological situation of the eastern part of the South China continent and the research results of the crustal and upper mantle structures in the eastern part of the South China continent in recent years. The remote seismic data recorded by 35 three-component wideband mobile stations from June 2012 to June 2014 and by 58 fixed stations from January 2011 to December 2012 in the eastern part of southern China are used. 6784 P-wave reception functions were extracted and the distribution of crustal thickness and wave-velocity ratio structure in the eastern Jiangxi and Fujian regions of South China were obtained by using H- 魏 scan superposition method. By means of the CCP superposition method of the reception function, the Moho surface morphology from the interior to the coastal area in the eastern part of the South China continent and the morphology of the deep 410 km and 660 km interfaces are obtained. Based on other geophysical data, the crustal and upper mantle structures in the eastern part of South China are discussed, and their dynamic models are preliminarily discussed. The results show that: (1) the crustal thickness ranges from 28 to 34 km in the eastern part of South China continent, and gradually decreases from inland to coastal, the crust of northwest Jiangxi and coastal areas is thin, and the crust of southeast Jiangxi and northwestern Fujian is thicker. The wave velocity ratio is between 1.61-1.83 and the corresponding Poisson ratio is between 0.21-0.28. The wave velocity ratio (Poisson ratio) increases from inland to coastal. In the study area, the crust is mainly intermediate and acidic rocks, and some areas are strongly affected by the upwelling of mantle material, and the composition of magnesium-iron in crustal rocks increases obviously, which leads to the increase of Poisson's ratio. In the coastal areas of Fuzhou and Zhangzhou, the Poisson ratio is relatively high, and there may be partial melting in the deep part. (2) along the Jiujiang-Ninghua section of Jiangxi Province, the average wave velocity ratio of the crust is between 1.65-1.75, and the corresponding average Poisson ratio of the crust is between 0.21-0.26. It reflects the Poisson's ratio structure in the eastern part of South China continent. Poisson's ratio shows that felsic rocks dominate the crustal rocks in the study area, indicating that the crustal structure in the study area is relatively stable and the vertical material exchange activity of crust and mantle is relatively weak. The ratio of wave velocity along Pingxiang-Guangfeng fault zone is obviously higher than that along both sides, which may be due to the deep residual Neoproterozoic ophiolite melange, which further proves that the fault is the convergence boundary of two blocks in north Jiangxi. It is a natural westward extension of the Jiangshao fault. (3) there are no obvious abrupt changes or fluctuations in the main intervelocity-velocity sections 4101km and 660 km of the upper mantle in the eastern part of the South China continent, and the thickness of the transition zone of the upper mantle is basically consistent with the global average. It is suggested that the temperature of the upper mantle transition zone in the eastern part of the South China continent remains normal, indicating that the upper mantle transition zone in the eastern part of the South China continent is not significantly affected by the collision between the Eurasian plate and the Philippine plate.
【學位授予單位】：中國地震局地球物理研究所
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P315.2
本文編號：2282261
[Abstract]:The eastern part of South China is located in the intersection area of Eurasian plate and Pacific plate, and has long been affected by subduction of the Indian Ocean plate, Pacific plate and Philippine sea plate, which is an extremely important part of the tectonic framework of the eastern margin of Eurasia. It is also one of the best natural laboratories for studying plate interaction. This paper briefly introduces the geological situation of the eastern part of the South China continent and the research results of the crustal and upper mantle structures in the eastern part of the South China continent in recent years. The remote seismic data recorded by 35 three-component wideband mobile stations from June 2012 to June 2014 and by 58 fixed stations from January 2011 to December 2012 in the eastern part of southern China are used. 6784 P-wave reception functions were extracted and the distribution of crustal thickness and wave-velocity ratio structure in the eastern Jiangxi and Fujian regions of South China were obtained by using H- 魏 scan superposition method. By means of the CCP superposition method of the reception function, the Moho surface morphology from the interior to the coastal area in the eastern part of the South China continent and the morphology of the deep 410 km and 660 km interfaces are obtained. Based on other geophysical data, the crustal and upper mantle structures in the eastern part of South China are discussed, and their dynamic models are preliminarily discussed. The results show that: (1) the crustal thickness ranges from 28 to 34 km in the eastern part of South China continent, and gradually decreases from inland to coastal, the crust of northwest Jiangxi and coastal areas is thin, and the crust of southeast Jiangxi and northwestern Fujian is thicker. The wave velocity ratio is between 1.61-1.83 and the corresponding Poisson ratio is between 0.21-0.28. The wave velocity ratio (Poisson ratio) increases from inland to coastal. In the study area, the crust is mainly intermediate and acidic rocks, and some areas are strongly affected by the upwelling of mantle material, and the composition of magnesium-iron in crustal rocks increases obviously, which leads to the increase of Poisson's ratio. In the coastal areas of Fuzhou and Zhangzhou, the Poisson ratio is relatively high, and there may be partial melting in the deep part. (2) along the Jiujiang-Ninghua section of Jiangxi Province, the average wave velocity ratio of the crust is between 1.65-1.75, and the corresponding average Poisson ratio of the crust is between 0.21-0.26. It reflects the Poisson's ratio structure in the eastern part of South China continent. Poisson's ratio shows that felsic rocks dominate the crustal rocks in the study area, indicating that the crustal structure in the study area is relatively stable and the vertical material exchange activity of crust and mantle is relatively weak. The ratio of wave velocity along Pingxiang-Guangfeng fault zone is obviously higher than that along both sides, which may be due to the deep residual Neoproterozoic ophiolite melange, which further proves that the fault is the convergence boundary of two blocks in north Jiangxi. It is a natural westward extension of the Jiangshao fault. (3) there are no obvious abrupt changes or fluctuations in the main intervelocity-velocity sections 4101km and 660 km of the upper mantle in the eastern part of the South China continent, and the thickness of the transition zone of the upper mantle is basically consistent with the global average. It is suggested that the temperature of the upper mantle transition zone in the eastern part of the South China continent remains normal, indicating that the upper mantle transition zone in the eastern part of the South China continent is not significantly affected by the collision between the Eurasian plate and the Philippine plate.
【學位授予單位】：中國地震局地球物理研究所
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P315.2
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