本文關(guān)鍵詞：中國近海泥質(zhì)沉積物粒度特征的指示意義研究　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 中國近海泥質(zhì)區(qū) 敏感粒度 替代指標(biāo) 東亞冬季風(fēng) 東亞夏季風(fēng)

【摘要】：中國近海泥質(zhì)沉積物敏感粒級的平均粒徑已被廣泛用于重建東亞冬季風(fēng)強(qiáng)度,但不同研究重建的結(jié)果之間存在一定差異,且近年來不斷有學(xué)者對一些區(qū)域泥質(zhì)沉積物敏感粒徑的指示意義提出不同觀點(diǎn)。此外,之前在黃、東海泥質(zhì)區(qū)的研究集中于整個全新世特別是中晚全新世以來較長時間尺度冬季風(fēng)記錄的重建,對不同泥質(zhì)區(qū)高分辨率的沉積記錄與器測數(shù)據(jù)的對比較為缺乏,使得利用泥質(zhì)沉積物重建古氣候記錄的研究基礎(chǔ)仍較為薄弱。為探討不同時間尺度上,黃、東海不同泥質(zhì)區(qū)沉積物敏感粒度影響因素的復(fù)雜性及其能否用于重建東亞冬季風(fēng)強(qiáng)度,本文首先搜集了前人利用泥質(zhì)區(qū)沉積物敏感粒度重建冬季風(fēng)的數(shù)據(jù)資料并進(jìn)行了對比分析;進(jìn)而利用敏感粒級提取和地球化學(xué)元素分析等方法,對北黃海西部泥質(zhì)區(qū)38002孔、南黃海中部泥質(zhì)區(qū)35009孔、長江口泥質(zhì)區(qū)T02孔三根插管柱樣以及北黃海西部泥質(zhì)區(qū)38002-A重力柱樣進(jìn)行了研究,以探討不同區(qū)域敏感序列之間的關(guān)系以及影響粒度變化的可能機(jī)制。主要研究內(nèi)容和結(jié)論如下:(1)分別對比了不同研究利用泥質(zhì)區(qū)敏感粒度重建的近8000年和3000年來的冬季風(fēng)強(qiáng)度序列,發(fā)現(xiàn)不同冬季風(fēng)記錄的變化趨勢之間存在顯著差別,分析認(rèn)為產(chǎn)生這些差異的可能原因包括年代誤差、敏感粒度組分(Sensitive Grain Size,SGS)的選取不同以及不同研究區(qū)域的沉積環(huán)境差異等。(2)在年代相對較為精確以及敏感粒度組分的選取較為一致的前提下,發(fā)現(xiàn)近百年來,三個不同泥質(zhì)沉積區(qū)的敏感粒度序列之間的變化趨勢并不完全一致,且均與西伯利亞高壓變化趨勢不同。在年代際時間尺度上,北黃海西部泥質(zhì)區(qū)和南黃海中部泥質(zhì)區(qū)由于特殊的成因機(jī)制,可能受冬季風(fēng)驅(qū)動的沿岸流影響較小,長江口泥質(zhì)區(qū)則受長江輸沙等因素的影響較大,導(dǎo)致這些區(qū)域沉積物的敏感粒徑變化均與反映冬季風(fēng)強(qiáng)度的西伯利亞高壓指數(shù)序列無顯著相關(guān),證實(shí)了泥質(zhì)區(qū)形成機(jī)制和沉積環(huán)境的差異會對敏感粒度特征產(chǎn)生較大影響。(3)進(jìn)一步,本研究選擇北黃海西部泥質(zhì)區(qū)沉積物進(jìn)行更長時間尺度上的研究。結(jié)果顯示,晚全新世以來,該泥質(zhì)區(qū)38002-A孔沉積物的敏感粒度組分及相關(guān)的元素比值等更多受到夏季風(fēng)控制的黃河流域降水的影響,受東亞冬季風(fēng)的影響較小。綜上所述,我國近海泥質(zhì)區(qū)沉積物的粒度特征受多種因素的影響,在利用泥質(zhì)沉積物敏感粒級的平均粒徑作為東亞冬季風(fēng)強(qiáng)度的替代指標(biāo)時需謹(jǐn)慎,應(yīng)考慮沉積物所在區(qū)域的沉積機(jī)制,尤其是環(huán)流體系及河流輸沙等因素的影響。盡管目前對于我國黃、東海陸架泥質(zhì)區(qū)的研究有了一定的認(rèn)識,以后仍應(yīng)加強(qiáng)對泥質(zhì)區(qū)沉積動力機(jī)制和過程的研究,尤其是敏感粒度變化對氣候變化的響應(yīng)機(jī)制等方面的研究,進(jìn)一步探討不同時間尺度上不同泥質(zhì)區(qū)沉積物敏感粒度作為東亞冬季風(fēng)指標(biāo)的可靠性。
[Abstract]:The average particle size of sensitive grains in China offshore mud sediments has been widely used to reconstruct East Asian winter monsoon intensity, but there are some differences between the results of different studies. In recent years, some scholars have put forward different views on the indication of sensitive particle size of mud sediments in some regions. The study of the muddy area in the East China Sea focuses on the reconstruction of winter monsoon records in the whole Holocene, especially since the middle and late Holocene. Therefore, the study of paleoclimate record reconstruction using muddy sediments is still weak. In order to discuss the different time scales, yellow. The complexity of the factors affecting the sensitive granularity of sediments in different muddy areas of the East China Sea and whether they can be used to reconstruct the East Asian winter monsoon intensity. In this paper, the data of winter monsoon reconstruction using sediment sensitive granularity in muddy area were collected and compared. Then, by means of sensitive grain-level extraction and geochemical element analysis, 38002 holes in the muddy area in the west of Huang Hai in the north and 35009 holes in the middle of the South Huang Hai were selected. The three tube column samples of T02 hole and the 38002-A gravity column of northern Huang Hai were studied in the muddy area of the Yangtze River Estuary. In order to explore the relationship between sensitive sequences of different regions and the possible mechanism of influencing grain size change, the main contents and conclusions of the study are as follows: 1). The winter monsoon intensity series of recent 8000 and 3000 were compared by using sensitive granularity reconstruction of muddy area. It is found that there are significant differences between the trends of different winter monsoon records, and the possible causes of these differences include year errors. Sensitive Grain Size. The selection of different SGSs and the difference of sedimentary environment in different research areas, etc.) in the premise of relatively accurate age and relatively consistent selection of sensitive granularity components, it was found that in the last hundred years. The change trend of sensitive granularity sequences in three different muddy sedimentary regions is not completely consistent, and is different from that of Siberian high pressure, and is different from that of Siberian high pressure in Interdecadal time scale. Due to the special genetic mechanism, the muddy areas in the western part of Huang Hai in the north and in the middle part of the South Huang Hai may be affected less by the coastal currents driven by the winter monsoon, while the muddy areas in the Yangtze River Estuary are more affected by the sediment transport along the Yangtze River. There was no significant correlation between the change of sensitive grain size and the Siberian high index series which reflected the intensity of winter monsoon. It is proved that the difference of the formation mechanism and sedimentary environment of the muddy area will have a great influence on the sensitive granularity characteristics. In this study, the sediments in the mud area of the western part of Huang Hai were studied on a longer time scale. The results showed that since the late Holocene. The sensitive granularity components and the relative element ratios of the sediment in the muddy area are more affected by the precipitation in the Yellow River basin controlled by the summer monsoon than by the East Asian winter monsoon. The grain size characteristics of sediments in China's offshore muddy areas are affected by many factors. It is necessary to be cautious in using the average particle size of sensitive grains of muddy sediments as an alternative indicator of East Asian winter monsoon intensity. The sedimentary mechanism of the area where the sediment is located should be considered, especially the influence of the circulation system and the river sediment transport, etc. Although there is a certain understanding of the study on the muddy areas of the Yellow and East China Sea shelf in China. In the future, the study on the dynamic mechanism and process of sediment in muddy area, especially the response mechanism of sensitive granularity change to climate change, should be strengthened. The reliability of the sensitive granularity of sediment in different muddy areas as an index of East Asian winter monsoon is further discussed in different time scales.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P736.21

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