本文關(guān)鍵詞： 粒度 粘土礦物 風(fēng)化作用 28kaB.P. 東亞季風(fēng)　出處：《中國(guó)地質(zhì)大學(xué)（北京）》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：本文針對(duì)萊州灣南岸BH2鉆孔上部14.70m巖心資料，通過(guò)年代學(xué)結(jié)果、粒度和粘土礦物的特征及其包含的環(huán)境代用指標(biāo)意義的解讀，對(duì)比研究區(qū)內(nèi)的已有成果、其他研究材料的環(huán)境信息及全球變化特征，解釋了萊州灣南岸平原28ka以來(lái)的沉積學(xué)記錄，并討論了其環(huán)境意義。主要結(jié)論如下： 1、利用光釋光（Optical Stimulated Luminescence, OSL）年代學(xué)方法內(nèi)插獲得了BH2孔的年代學(xué)標(biāo)尺。結(jié)果顯示BH2孔沉積時(shí)限為28ka，5.94ka B.P沉積速率發(fā)生一次大的轉(zhuǎn)折，28~5.94ka B.P.階段沉積速率為0.14m/ka，5.94ka以來(lái)沉積速率為1.97m/ka。通過(guò)對(duì)比BH1孔和Lz908孔的沉積特征，沉積速率的轉(zhuǎn)折是由于氣候變暖背景下物質(zhì)輸運(yùn)量增大，高海面期后海水對(duì)河水能量的抵消作用減弱，造成沉積物的迅速堆積。 2、粘土礦物含量具有分段性。可分為底部蒙脫石和高嶺石低值、伊利石高值段，中部蒙脫石和高嶺石高值、伊利石低值段，上部蒙脫石、高嶺石和綠泥石低值、伊利石高值段3段。沉積物的母巖主要為極低變質(zhì)作用和淺變質(zhì)作用形成的巖石；黃河來(lái)源的沉積物和山東半島黃土也可能為萊州灣南岸的兩個(gè)物源。伊利石的化學(xué)指數(shù)和膨脹層的相對(duì)數(shù)量在韻律上變化相同，，但不能反映全新世變暖背景下的化學(xué)風(fēng)化作用，分析是由于物質(zhì)輸入量的大幅增加及海面變化所導(dǎo)致。 3、粒度反映出沉積物類(lèi)型具有分段性。不同環(huán)境的沉積物粒徑大小明顯不同，其中全新世之前的沉積物表現(xiàn)為細(xì)粒沉積，而全新世內(nèi)的沉積過(guò)程形成了粗粒沉積。平均粒徑和分選系數(shù)反映出了海平面變化影響下的沉積過(guò)程特征：海面升高時(shí)，海水與河水能量抵消，潮流、波浪對(duì)沉積物的淘洗和再懸浮作用強(qiáng)烈，反映了低速的沉積過(guò)程；海水退去時(shí)，河流快速堆積，沉積速率較大，分選較差，反映了河流沉積的特征。 4、粒度的主成分分析結(jié)果表明，第一主成分F1的方差貢獻(xiàn)量為54.7%，控制了整個(gè)沉積物的粒度變化；第二主成分（F2）的方差為22.5%，前兩個(gè)主成分涵蓋了沉積物的大多數(shù)組分。F1變化與細(xì)粒組分含量相同，可以指示東亞冬季風(fēng)的變率，而F2與中粗粒組分含量變化相同，可以指示東亞夏季風(fēng)的變率。冬季風(fēng)和夏季風(fēng)在變冷過(guò)程中呈正相關(guān)關(guān)系，兩者在偏暖環(huán)境下呈負(fù)相關(guān)關(guān)系。
[Abstract]:Based on the data of 14.70m core in the upper part of BH2 borehole on the south bank of Laizhou Bay, this paper compares the existing results in the study area through the interpretation of the geochronological results, the characteristics of granularity and clay minerals, and the significance of the environmental substitute indicators included in the study area. The environmental information of other materials and the characteristics of global change explain the sedimentological records of Laizhou Bay South Coast Plain since 28ka and discuss their environmental significance. The main conclusions are as follows:. 1. The geochronological scale of BH2 pore was obtained by means of optical Stimulated chronology method. The results show that the deposition time of BH2 pore is 28ka- 5.94ka B.P. the deposition rate of BH2 pore is 0.14m / Ka5.94ka B.P. By comparing the sedimentary characteristics of the BH1 pore and the Lz908 pore, The change of sedimentation rate is due to the increase of mass transport under the background of climate warming and the weakening of the counteracting effect of seawater to the river water energy after the high sea level, which results in the rapid accumulation of sediment. 2. The clay mineral content is segmented. It can be divided into low value of bottom montmorillonite and kaolinite, high value of Illite, high value of middle montmorillonite and kaolinite, low value of Illite, low value of upper montmorillonite, kaolinite and chlorite. The parent rocks of the sediments are mainly formed by very low metamorphism and shallow metamorphism. The sediment from the Yellow River and loess from Shandong Peninsula may also be two provenances from the southern shore of the Laizhou Bay. The chemical index of Illite and the relative quantity of the expander are the same in rhythm, but they cannot reflect the chemical weathering in the warm background of Holocene. The analysis is due to a large increase in material input and changes in the sea surface. 3, the grain size shows that the sediment type is segmented. The size of sediment is obviously different in different environments, and the sediment before Holocene is fine grained. The mean particle size and sorting coefficient reflect the characteristics of the sedimentary process under the influence of sea level change: when the sea level rises, the energy of sea water and river water cancel, the tidal current, and the mean particle size and separation coefficient reflect the characteristics of sedimentary process under the influence of sea level change. The washing and resuspending of the sediments by waves reflects the process of low-velocity deposition, and the rapid accumulation of the rivers when the sea water retreats, the high deposition rate and the poor separation, which reflect the characteristics of the river sediments. 4. The results of principal component analysis of grain size showed that the variance contribution of the first principal component F1 was 54.7, which controlled the grain size change of the whole sediment. The variance of the second principal component (F2) is 22.5.The first two principal components cover most of the sediment components. The changes of .F1 are the same as the contents of fine-grained components, which can indicate the variability of the East Asian winter monsoon, while the changes of F2 and the contents of the middle coarse grains are the same. The winter monsoon and summer monsoon have a positive correlation with each other in the process of cooling, and there is a negative correlation between the winter monsoon and the summer monsoon in the warm environment.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)（北京）
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：P736.2

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