本文選題：海岸沙丘 + 光釋光測年　； 參考：《中國地質大學（北京）》2014年碩士論文

【摘要】：海岸沙丘在我國分布及其廣泛，而海岸沙丘沉積是記錄海岸帶環(huán)境演變的良好信息載體，因此可以作為揭示古環(huán)境演變途徑的一個重要補充。本文選擇遼寧盤錦海岸沙丘為研究對象，采用野外考察、典型剖面選取懫樣、室內實驗分析、區(qū)域對比和綜合分析的方法開展研究工作。通過對盤錦海岸沙丘的光釋光測年和沙丘粒度特征的分析，確定了沙丘的發(fā)育年代；并結合盤錦地區(qū)地形地貌、氣候水文等方面的資料分析盤錦沙丘的成因；在統(tǒng)一的時間標尺上，綜合對比東亞季風變化序列、近千年來區(qū)域降水量和溫度變化記錄探討了沙丘形成的控制因素和環(huán)境意義。通過以上分析得出以下結論： （1）粒度分析結果顯示，盤錦海岸沙丘砂由中、細砂組成，以細砂為主，分選中等，粒度頻率曲線普遍為單峰加一細尾，峰態(tài)較窄。與典型海岸沙丘相比，沉積物粒徑偏細，頻率曲線細尾更為明顯，造成這種差異可能是由風沙沉積后，遭受后期的風化作用造成的。整體上來看，，盤錦海岸沙丘的粒度組成與國內其他地區(qū)的海岸沙丘組成相類似，表現(xiàn)出了典型海岸風成沙丘的特征。 （2）通過對盤錦海岸沙丘剖面3現(xiàn)場觀察，結合剖面粒度特征的分析得出，盤錦沙丘剖面3以0.2m為界，0.2m以上部分為風成沙丘，0.2m以下部分為灰黑色砂質粘土，風成沙丘和灰黑色古土壤沉積特征的差異，指示了剖面沉積環(huán)境的變化，并確定了沙丘的底界。 （3）通過對盤錦沙丘的OSL測年，確定了沙丘的發(fā)育于近800年以來，并通過與東亞季風和千年降水量和溫度記錄等因素，綜合對比分析得出影響盤錦沙丘形成的主要因素為干冷的氣候條件。 （4）形成沙丘的有利條件：大凌河、遼河等河流攜帶大量泥沙入海為沙丘發(fā)育提供了充足的物質來源，春季持久干燥的西南向岸風為沙丘的發(fā)育提供的動力條件，盤錦地區(qū)平坦寬廣的地形條件有利于海灘沉積物向岸搬運而形成海岸沙丘。
[Abstract]:Coastal dune is widely distributed in China, and coastal dune deposition is a good information carrier to record the evolution of coastal zone environment, so it can be used as an important supplement to reveal the path of paleoenvironmental evolution. In this paper, the sand dune in Panjin coast of Liaoning Province is chosen as the research object. The methods of field investigation, typical section selection, laboratory experimental analysis, regional contrast and comprehensive analysis are used to carry out the research work. Based on the analysis of photoluminescence dating and grain size characteristics of panjin sand dune, the development age of sand dune is determined, and the origin of panjin sand dune is analyzed with the data of topography, geomorphology, climate and hydrology, etc. Based on a unified time scale and a comprehensive comparison of the East Asian monsoon variation series, the controlling factors and environmental significance of sand dune formation are discussed in the recent millennia of regional precipitation and temperature change records. Through the above analysis, the following conclusions are drawn: The results of grain size analysis show that the sand of Panjin coast dune is composed of medium and fine sand, mainly fine sand and medium sorting. The particle size frequency curve is generally single peak with a fine tail, and the peak state is narrow. Compared with the typical coastal dunes, the grain size of the sediment is smaller and the finer tail of the frequency curve is more obvious, which may be caused by the late weathering of the aeolian sand deposit. On the whole, the granularity composition of Panjin coastal dune is similar to that of other coastal dunes in China, showing the typical coastal eolian sand dunes. (2) based on the field observation of Panjin coastal dune profile 3 and the analysis of the grain size characteristics of the section, it is concluded that Panjin dune section 3 is gray-black sandy clay with a boundary of 0.2m or more than 0.2m of wind-formed sand dunes and less than 0.2m. The difference between eolian sand dunes and gray-black paleosols indicates the change of sedimentary environment in the profile and determines the bottom boundary of sand dunes. The OSL dating of Panjin dune shows that the sand dune has developed in the past 800 years, and has been associated with the East Asian Monsoon and the Millennium precipitation and temperature record, etc. The main factors affecting the formation of Panjin sand dunes are dry and cold climatic conditions. 4) favorable conditions for sand dune formation: Daling River, Liaohe River and other rivers carry a large amount of sediment into the sea to provide sufficient material sources for the development of sand dunes, and the long-lasting dry southwest coastal wind in spring provides the power for the development of sand dunes. The flat and broad terrain conditions in Panjin area are favorable for beach sediment to be transported to shore to form coastal sand dunes.
【學位授予單位】：中國地質大學（北京）
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P737.1

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