本文關(guān)鍵詞： 渤海南岸 有孔蟲組合 沉積環(huán)境 氣候代用指標　出處：《中國科學(xué)院研究生院（海洋研究所）》2014年博士論文　論文類型：學(xué)位論文

【摘要】：第四紀冰期-間冰期交替的氣候變化造成了全球海平面的波動，在海岸帶地區(qū)表現(xiàn)為海陸交互相沉積。海岸帶地區(qū)沉積物記錄了沉積環(huán)境變化的豐富信息。通過研究海陸交互相沉積物來探討沉積環(huán)境演化，重建區(qū)域環(huán)境變化歷史，對于認識海陸相互作用以及預(yù)測未來環(huán)境演變具有重要意義。本文研究的LZ908孔位于渤海萊州灣南岸，在建立相對可靠的年齡框架的基礎(chǔ)上，結(jié)合沉積物有孔蟲特征研究了渤海南部地區(qū)海侵、海退的古海洋環(huán)境變化；對沉積物的顏色反射率各參數(shù)變化進行主成分分析，根據(jù)結(jié)果討論影響海陸交互相沉積物顏色變化的主要因子；對沉積物粒度、顏色反射率、磁化率及孢粉這些指標進行分析，探討各指標的環(huán)境指示意義、周期性變化及可能的影響因素。將各指標反映的氣候變化與全球氣候變化或海平面變化進行對比，得到萊州灣地區(qū)的區(qū)域性氣候變化特征。得到的初步結(jié)論如下： 1.通過對渤海萊州灣南岸LZ908孔的研究，識別了LZ908孔的有孔蟲組合特征，結(jié)合AMS14C和光釋光測年結(jié)果，對比渤海地區(qū)其它鉆孔資料，，對晚第四紀的環(huán)境變化過程進行了重建，認為三次大規(guī)模海侵開始于MIS7，MIS5和全新世，另外在MIS6的中期也發(fā)生了一次小規(guī)模的海侵。LZ908孔在MIS3階段存在海侵地層，但是有孔蟲特征顯示這一時期的溫度低于MIS5階段。 2.通過將LZ908孔的亮度與碳酸鈣含量進行對比，發(fā)現(xiàn)L*值與CaCO3含量曲線的變化非常一致，在海陸交互相沉積物中，將L*值作為碳酸鹽的替代指標是可行的。采用方差極大旋轉(zhuǎn)法對樣品顏色反射率的一階導(dǎo)數(shù)進行了因子分析，通過將因子的載荷曲線與已知沉積物組分的一階導(dǎo)數(shù)曲線進行對比，得到因子1與沉積物中有機物含量相關(guān)，因子2與沉積物中的粘土礦物含量關(guān)系較大，因子3與沉積物中針鐵礦相關(guān)。 3.通過對沉積物粒度的主成分分析，發(fā)現(xiàn)LZ908孔32μm的細粒部分的含量與65oN夏季太陽輻射的變化和神農(nóng)架三寶洞石筍的δ18O值的變化十分相似，表明LZ908鉆孔沉積物32μm的細粒部分的含量可以作為指示東亞季風(fēng)強度的一個很好的指標。通過將磁化率和孢粉數(shù)據(jù)相結(jié)合，結(jié)果表明磁化率是一個良好的氣候指標，高磁化率指示暖濕氣候，低磁化率反映干冷氣候。將LZ908孔的磁化率曲線與深海氧同位素曲線進行對比，磁化率高值對應(yīng)氧同位素低值，為間冰期環(huán)境，磁化率低值對應(yīng)氧同位素高值，為冰期環(huán)境。亮度值和CaCO3含量較高的層位大致為海平面較高的時期，指示溫暖濕潤的環(huán)境；相反地，亮度值和CaCO3含量較低的層位表明氣候寒冷干燥，大多為海平面較低的時期。在LZ908鉆孔的沉積序列中，紅度值a*值的變化主要反映了沉積環(huán)境的氧化還原狀態(tài)，冰期時期為低海平面時期的河漫灘環(huán)境，沉積環(huán)境為氧化環(huán)境，高價鐵的氧化物和氫氧化物增加，沉積物顏色為紅褐色或黃褐色，a*值也較大。間冰期的淺�；驗I海環(huán)境，沉積環(huán)境為還原環(huán)境，高價鐵的氧化物和氫氧化物轉(zhuǎn)化為低價鐵的氧化物和氫氧化物，沉積物顏色為深灰色、灰褐色或棕綠色，a*值也較小。 4.通過對LZ908鉆孔沉積物的粒度、磁化率和紅度值a*值時間序列的頻譜分析，得到250ka以來，渤海萊州灣南岸海陸交互相沉積物粒度、磁化率和紅度值分別記錄了軌道歲差、傾斜度和偏心率的周期特征。
[Abstract]:The Quaternary glacial interglacial alternation of climate change caused by global sea-level fluctuations, with area in the coast of paralic zone sediment deposition. Rich information recorded the changes of sedimentary environment of the coast. Through the study of paralic sediments to explore the evolution of the sedimentary environment, the reconstruction of regional environment change history, for the understanding of the interaction between sea and land and to predict the future environmental change has important significance. This paper studies the LZ908 hole is located on the South Bank of Bohai Bay in Laizhou, based on the framework of age is relatively reliable, the transgressive region of southern Bohai with sediments foraminiferal characteristics, ancient marine environment change regression; the parameters change on sediment color reflectance by principal component analysis and discussion the main factors affecting paralic sediments change color according to the results of grain size, color reflectance, Analysis of magnetic susceptibility and pollen of these indicators, the index of environmental significance, cyclical changes and possible influence. Comparing the climate change and global climate change and sea level changes in the indicators reflect the regional climate, from Laizhou Bay area and the characteristics of the preliminary conclusions are as follows:
1. through the study of Bohai Laizhou Bay LZ908 hole, characteristics of foraminiferal assemblages to identify the LZ908 hole, the combination of AMS14C and OSL dating results, in contrast to the Bohai area other drilling data, the late Quaternary environmental change on the process of reconstruction, that the three transgression started at MIS7 and MIS5 and also in the Holocene. Middle MIS6 also occurred in a small hole are transgressive.LZ908 transgressive formations in the stage of MIS3, but this time the foraminifera characteristics show that the temperature is lower than MIS5.
2. through the LZ908 hole brightness and the content of calcium carbonate were compared, it was found that L* value is consistent with the change of CaCO3 content curve, in paralic sediments, the L* value as an alternative index of carbonate is feasible. Using the varimax rotation method of sample color reflectance first derivative by factor analysis, through comparing the first derivative curve load curve factor with known sediment composition, organic matter content by factor 1 and relative content of clay minerals in sediments, the relationship between factor 2 and sediment in the larger, factor 3 and goethite in sediments.
3. through the principal component analysis of sediment grain size, change Delta 18O variation of LZ908 hole 32 m fine part of 65oN and the content of solar radiation in summer and Shennongjia Sanbao Cave Stalagmite value is very similar to that of sediments of core LZ908 32 m fine part of the content can be a good index as an indicator of East Asia the intensity of monsoon. By combining the magnetic susceptibility and pollen data, results show that the magnetic susceptibility is a good climate index, high magnetic susceptibility indicates low susceptibility to reflect the warm and humid climate, dry and cold climate. The magnetization of the LZ908 hole rate curve was compared with the deep-sea oxygen isotope curve, high magnetic susceptibility values correspond to low oxygen isotope values for, inter glacial environment, low magnetic susceptibility values corresponding to oxygen isotope value for the glacial environment. The lightness and high content of CaCO3 layer is roughly the period with higher sea levels, indicating the warm and humid environment; on the contrary And the lightness and low CaCO3 content layers show that the climate is cold and dry, mostly for the lower sea level period. In the sedimentary sequence of LZ908 drilling, the red value a* value changes mainly reflect the sedimentary environment of the oxidation reduction state, glacial period for low sea level period floodplain environment, sedimentary environment as the oxidation environment, oxides and hydroxides of Fe increases, sediment color is red brown or brown, a* value is also larger. Binhai interglacial or shallow water environment, sedimentary environment is reductive, ferric oxide and hydroxide into low iron oxides and hydroxides, the sediment color is dark gray, brown or brown green, the a* value is smaller.
4. the granularity of LZ908 cores, magnetic susceptibility and red value spectrum analysis of a* time series, 250kA, Bohai Laizhou Bay paralic sediment grain size, magnetic susceptibility and redness were recorded in orbital precession cycle characteristics of inclination and eccentricity.

【學(xué)位授予單位】：中國科學(xué)院研究生院（海洋研究所）
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：P736.21

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