南方风成沉积粒度敏感组分的分离与物源初探
发布时间：2018-08-30 11:24
【摘要】：加积型红土、下蜀黄土、老红砂是分布在中国亚热带地区的三种典型的第四纪风成沉积物,这些沉积物都是可以记录历史时期的气候、环境变化的重要载体。本论文主要选择了三种典型的风成沉积的9个剖面,分别是：安徽宣城FL和XC、江西九江JL、浙江浦江PF和汤溪TX、湖南沅江YJ六个剖面为加积型红土沉积；南京的新港(XG)下蜀黄土剖面；福州青峰QF剖面和舟山的东沙DS剖面,都是老红砂沉积。在对粒度组成和粒度频率曲线分析的基础上,采用粒级—标准偏差法提取各类风成沉积物的粒度敏感组分,通过对各类风成沉积物间粒度敏感组分的关系进行探讨,对各类风成沉积物间存在的物质联系进行了初步探讨。主要研究结果如下：(1)中亚热带不同类型的第四纪风成沉积物都有三个环境敏感粒度组分,具体如下：下蜀黄土XG剖面的3个粒度敏感组分,分别是：组分1(0.61μm)、组分2(4.87μm)和组分3(29.59μmm)；FL剖面三个粒度敏感组分分别是：组分1(0.60μm)、组分2(5.00μm)和组分3(22.92μm)；XC剖面的3个敏感组分分别是,组分1(0.61μm)、组分2(3.61μm)和组分3(19.99μm)；JL剖面的敏感组分是：组分1(0.94μm)组分2(5.34μm)和组分3(25.8μm)；PF剖面的3个敏感组分是：组分1(0.87μm)、组分2(11.47μm)和组分3(160.73μm)；TX剖面的粒度敏感组分是：组分1(0.56μm)、组分2(2.83μm)和组分3(13.24μm)；YJ剖面的粒度敏感组分是：组分1(0.59μm)、组分2(4.47μm)和组分3(17.12μm)；老红砂剖面DS和QF的敏感组分分别是：DS剖面的组分1(0.60μm)、组分2(13.02μm)、组分3(213.03μm)；QF剖面的组分1(10.03μm)、组分2(180.66μm)；组分3(472.65μm)。(2)中亚热带不同类型的第四纪风成沉积物的粒度敏感组分存在着一定的区别和联系；下蜀黄土XG剖面与加积型红土剖面都具有3个粒度组分,且各粒度组分的指示意义基本一致,分别指示粘粒组分,对应风化作用；高空远源颗粒组分,对应风力作用；风尘基本粒组,对应冬季风的强弱。但PF剖面除外,PF剖面由于受近源物质及其他因素的影响,其粘粒组分高于其他剖面,且风尘基本粒组的平均粒径较小,并且有指示近源物质影响的敏感组分3。老红砂剖面的三个敏感粒度组分分别对应着粘粒组分,风尘基本粒组和跃移组分。大于63μm的颗粒受强风力的影响也难以被长距离搬运,一般被视为近源组分,DS剖面的组分2和QF剖面的组分2、组分3的平均粒径均远大于63μm,也就说明这两个剖面形成过程中受近源的海滩砂影响较大。(3)不同类型风成沉积物的敏感粒度组分存在差异,主要是受距离物源的远近和空间位置的影响。结合风成沉积物各剖面的空间位置,通过对中亚热带第四纪风成沉积物各剖面粒度组分的比较得出：下蜀黄土XG与其下风向的宣城FL和XC剖面的风尘基本粒组的平均粒径有从西北向东南变小的趋势,这与东亚冬季风的走向一致,因此考虑下蜀黄土与加积型红土可能存在物源上的联系；老红砂DS和QF剖面由于处在沿海位置,受季风的影响,有足够的风力把粘粒组分和基本风尘粒组带到位于两者下风向交界处的PF和TX剖面,这可能是导致PF和TX剖面的粘粒组分高于其他加积型红土剖面的原因。九江JL剖面和沅江YJ剖面,也存在着纬度上的差异,两个剖面敏感组分的不同,主要是受冬季风及距离源区的远近影响所形成的。
[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.
【学位授予单位】：浙江师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P512.2
本文编号：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.
【学位授予单位】：浙江师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P512.2
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