南方風成沉積粒度敏感組分的分離與物源初探
發(fā)布時間：2018-08-30 11:24
【摘要】：加積型紅土、下蜀黃土、老紅砂是分布在中國亞熱帶地區(qū)的三種典型的第四紀風成沉積物,這些沉積物都是可以記錄歷史時期的氣候、環(huán)境變化的重要載體。本論文主要選擇了三種典型的風成沉積的9個剖面,分別是：安徽宣城FL和XC、江西九江JL、浙江浦江PF和湯溪TX、湖南沅江YJ六個剖面為加積型紅土沉積；南京的新港(XG)下蜀黃土剖面；福州青峰QF剖面和舟山的東沙DS剖面,都是老紅砂沉積。在對粒度組成和粒度頻率曲線分析的基礎(chǔ)上,采用粒級—標準偏差法提取各類風成沉積物的粒度敏感組分,通過對各類風成沉積物間粒度敏感組分的關(guān)系進行探討,對各類風成沉積物間存在的物質(zhì)聯(lián)系進行了初步探討。主要研究結(jié)果如下：(1)中亞熱帶不同類型的第四紀風成沉積物都有三個環(huán)境敏感粒度組分,具體如下：下蜀黃土XG剖面的3個粒度敏感組分,分別是：組分1(0.61μm)、組分2(4.87μm)和組分3(29.59μmm)；FL剖面三個粒度敏感組分分別是：組分1(0.60μm)、組分2(5.00μm)和組分3(22.92μm)；XC剖面的3個敏感組分分別是,組分1(0.61μm)、組分2(3.61μm)和組分3(19.99μm)；JL剖面的敏感組分是：組分1(0.94μm)組分2(5.34μm)和組分3(25.8μm)；PF剖面的3個敏感組分是：組分1(0.87μm)、組分2(11.47μm)和組分3(160.73μm)；TX剖面的粒度敏感組分是：組分1(0.56μm)、組分2(2.83μm)和組分3(13.24μm)；YJ剖面的粒度敏感組分是：組分1(0.59μm)、組分2(4.47μm)和組分3(17.12μm)；老紅砂剖面DS和QF的敏感組分分別是：DS剖面的組分1(0.60μm)、組分2(13.02μm)、組分3(213.03μm)；QF剖面的組分1(10.03μm)、組分2(180.66μm)；組分3(472.65μm)。(2)中亞熱帶不同類型的第四紀風成沉積物的粒度敏感組分存在著一定的區(qū)別和聯(lián)系；下蜀黃土XG剖面與加積型紅土剖面都具有3個粒度組分,且各粒度組分的指示意義基本一致,分別指示粘粒組分,對應(yīng)風化作用；高空遠源顆粒組分,對應(yīng)風力作用；風塵基本粒組,對應(yīng)冬季風的強弱。但PF剖面除外,PF剖面由于受近源物質(zhì)及其他因素的影響,其粘粒組分高于其他剖面,且風塵基本粒組的平均粒徑較小,并且有指示近源物質(zhì)影響的敏感組分3。老紅砂剖面的三個敏感粒度組分分別對應(yīng)著粘粒組分,風塵基本粒組和躍移組分。大于63μm的顆粒受強風力的影響也難以被長距離搬運,一般被視為近源組分,DS剖面的組分2和QF剖面的組分2、組分3的平均粒徑均遠大于63μm,也就說明這兩個剖面形成過程中受近源的海灘砂影響較大。(3)不同類型風成沉積物的敏感粒度組分存在差異,主要是受距離物源的遠近和空間位置的影響。結(jié)合風成沉積物各剖面的空間位置,通過對中亞熱帶第四紀風成沉積物各剖面粒度組分的比較得出：下蜀黃土XG與其下風向的宣城FL和XC剖面的風塵基本粒組的平均粒徑有從西北向東南變小的趨勢,這與東亞冬季風的走向一致,因此考慮下蜀黃土與加積型紅土可能存在物源上的聯(lián)系；老紅砂DS和QF剖面由于處在沿海位置,受季風的影響,有足夠的風力把粘粒組分和基本風塵粒組帶到位于兩者下風向交界處的PF和TX剖面,這可能是導(dǎo)致PF和TX剖面的粘粒組分高于其他加積型紅土剖面的原因。九江JL剖面和沅江YJ剖面,也存在著緯度上的差異,兩個剖面敏感組分的不同,主要是受冬季風及距離源區(qū)的遠近影響所形成的。
[Abstract]:Accumulated laterite, Xiashu loess and Old Red Sand are three typical Quaternary aeolian sediments distributed in subtropical China. These sediments are important carriers for recording climatic and environmental changes in historical periods. Six sections of Xijiujiang JL, Pujiang PF and Tangxi TX in Zhejiang Province, Yuanjiang YJ in Hunan Province are accretive laterite deposits, Xiashu loess section in Nanjing Xingang (XG), QF section in Fuzhou Qingfeng and Dongsha DS section in Zhoushan are all old red sand deposits. The main results are as follows: (1) There are three environmentally sensitive grain-size groups in different types of Quaternary Aeolian Sediments in the middle subtropics. The results are as follows: the three grain-size sensitive components of Xiashu loess XG profile are: component 1 (0.61 micron), component 2 (4.87 micron) and component 3 (29.59 micron m); the three grain-size sensitive components of FL profile are component 1 (0.60 micron), component 2 (5.00 micron) and component 3 (22.92 micron); the three sensitive components of XC profile are component 1 (0.61 micron), component 2 (3.6 micron). The sensitive components of JL profile are: component 1 (0.94 micron) component 2 (5.34 micron) and component 3 (25.8 micron); the three sensitive components of PF profile are: component 1 (0.87 micron), component 2 (11.47 micron) and component 3 (160.73 micron); the particle size sensitive components of TX profile are: component 1 (0.56 micron), component 2 (2.83 micron) and component 3 (13.24 micron); The grain-size sensitive components of the surface are: component 1 (0.59 micron), component 2 (4.47 micron) and component 3 (17.12 micron); the sensitive components of DS and QF in the old red sand section are: component 1 (0.60 micron), component 2 (13.02 micron), component 3 (213.03 micron); component 1 (10.03 micron) and component 2 (180.66 micron) in the QF section; component 3 (472.65 micron). (2) different subtropical types. The XG section of Xiashu Loess and the accretionary laterite section have three grain-size components, and the indicative significance of each grain-size component is basically the same, indicating the clay component corresponding to weathering, and the high-altitude distant particle component corresponding to wind and dust. The basic grain group corresponds to the strength of the winter monsoon. But except for PF section, the clay component of PF section is higher than that of other sections because of the influence of near source material and other factors, and the average particle size of the basic dust group is smaller, and there are sensitive components indicating the influence of near source material. 3. The three sensitive grain-size components of the old red sand section correspond to viscosity respectively. Particles larger than 63 microns are also difficult to be transported over long distances due to strong wind. Generally, they are regarded as near-source components. Components 2 of DS section and 2 of QF section, and the average particle size of component 3 are much larger than 63 microns, which indicates that the formation process of these two profiles is greatly influenced by near-source Beach sand. The sensitive grain-size components of different types of aeolian sediments are different, mainly influenced by the distance from the source and the spatial position of the aeolian sediments. By comparing the grain-size components of each section of the Aeolian Sediments in the middle subtropical Quaternary, it is concluded that XG of Xiashu loess and Xuancheng FL and XC of its downwind direction are different. The mean particle size of the basic aeolian dust grains on the surface tends to decrease from northwest to southeast, which is consistent with the trend of the East Asian winter monsoon. Therefore, it is considered that the Xiashu loess may be related to the accretive laterite in provenance; the old red sand DS and QF sections, due to their coastal location, are subject to the influence of the monsoon, have enough wind power to bring the clay composition and the basic wind. This may be the reason why the clay composition of PF and TX sections is higher than that of other accretive laterite sections. There are also latitudinal differences between Jiujiang JL section and Yuanjiang YJ section. The sensitive components of the two sections are mainly affected by the winter monsoon and the distance from the source area. Formed.
【學位授予單位】：浙江師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P512.2
本文編號：2212917
[Abstract]:Accumulated laterite, Xiashu loess and Old Red Sand are three typical Quaternary aeolian sediments distributed in subtropical China. These sediments are important carriers for recording climatic and environmental changes in historical periods. Six sections of Xijiujiang JL, Pujiang PF and Tangxi TX in Zhejiang Province, Yuanjiang YJ in Hunan Province are accretive laterite deposits, Xiashu loess section in Nanjing Xingang (XG), QF section in Fuzhou Qingfeng and Dongsha DS section in Zhoushan are all old red sand deposits. The main results are as follows: (1) There are three environmentally sensitive grain-size groups in different types of Quaternary Aeolian Sediments in the middle subtropics. The results are as follows: the three grain-size sensitive components of Xiashu loess XG profile are: component 1 (0.61 micron), component 2 (4.87 micron) and component 3 (29.59 micron m); the three grain-size sensitive components of FL profile are component 1 (0.60 micron), component 2 (5.00 micron) and component 3 (22.92 micron); the three sensitive components of XC profile are component 1 (0.61 micron), component 2 (3.6 micron). The sensitive components of JL profile are: component 1 (0.94 micron) component 2 (5.34 micron) and component 3 (25.8 micron); the three sensitive components of PF profile are: component 1 (0.87 micron), component 2 (11.47 micron) and component 3 (160.73 micron); the particle size sensitive components of TX profile are: component 1 (0.56 micron), component 2 (2.83 micron) and component 3 (13.24 micron); The grain-size sensitive components of the surface are: component 1 (0.59 micron), component 2 (4.47 micron) and component 3 (17.12 micron); the sensitive components of DS and QF in the old red sand section are: component 1 (0.60 micron), component 2 (13.02 micron), component 3 (213.03 micron); component 1 (10.03 micron) and component 2 (180.66 micron) in the QF section; component 3 (472.65 micron). (2) different subtropical types. The XG section of Xiashu Loess and the accretionary laterite section have three grain-size components, and the indicative significance of each grain-size component is basically the same, indicating the clay component corresponding to weathering, and the high-altitude distant particle component corresponding to wind and dust. The basic grain group corresponds to the strength of the winter monsoon. But except for PF section, the clay component of PF section is higher than that of other sections because of the influence of near source material and other factors, and the average particle size of the basic dust group is smaller, and there are sensitive components indicating the influence of near source material. 3. The three sensitive grain-size components of the old red sand section correspond to viscosity respectively. Particles larger than 63 microns are also difficult to be transported over long distances due to strong wind. Generally, they are regarded as near-source components. Components 2 of DS section and 2 of QF section, and the average particle size of component 3 are much larger than 63 microns, which indicates that the formation process of these two profiles is greatly influenced by near-source Beach sand. The sensitive grain-size components of different types of aeolian sediments are different, mainly influenced by the distance from the source and the spatial position of the aeolian sediments. By comparing the grain-size components of each section of the Aeolian Sediments in the middle subtropical Quaternary, it is concluded that XG of Xiashu loess and Xuancheng FL and XC of its downwind direction are different. The mean particle size of the basic aeolian dust grains on the surface tends to decrease from northwest to southeast, which is consistent with the trend of the East Asian winter monsoon. Therefore, it is considered that the Xiashu loess may be related to the accretive laterite in provenance; the old red sand DS and QF sections, due to their coastal location, are subject to the influence of the monsoon, have enough wind power to bring the clay composition and the basic wind. This may be the reason why the clay composition of PF and TX sections is higher than that of other accretive laterite sections. There are also latitudinal differences between Jiujiang JL section and Yuanjiang YJ section. The sensitive components of the two sections are mainly affected by the winter monsoon and the distance from the source area. Formed.
【學位授予單位】：浙江師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P512.2
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