本文選題：郎溪　切入點(diǎn)：網(wǎng)紋紅土　出處：《華東師范大學(xué)》2015年碩士論文

【摘要】：第四紀(jì)網(wǎng)紋紅土在我國南方熱帶、亞熱帶地區(qū)廣泛分布,是研究古環(huán)境演化的重要陸相載體。前人已經(jīng)對(duì)網(wǎng)紋紅土進(jìn)行了大量的研究,但是網(wǎng)紋紅土的物源和成因還存在很大的爭(zhēng)議。本研究在宣城郎溪剖面開展。郎溪剖面中部鐵錳盤層,灰白色強(qiáng)網(wǎng)紋發(fā)育層和磚紅色強(qiáng)網(wǎng)紋發(fā)育層特征明顯,對(duì)于深入探討網(wǎng)紋紅土的物源和成因具有很有價(jià)值的指示意義。通過磁學(xué)指標(biāo)、粒度指標(biāo)、地球化學(xué)元素指標(biāo)分析郎溪剖面網(wǎng)紋紅土的理化特性,對(duì)比他人研究結(jié)果,得到以下結(jié)果：(1)郎溪網(wǎng)紋紅土經(jīng)歷了強(qiáng)烈的風(fēng)化作用,5μm組分含量為43%,10-50μm眾數(shù)粒組含量為37%,顆粒粒徑明顯細(xì)于下蜀黃土和西北黃土-古土壤。粒度頻率分布曲線和粒度概率累計(jì)曲線顯示近源物質(zhì)對(duì)郎溪網(wǎng)紋紅土的物源有一定的貢獻(xiàn)。(2)剖面鐵錳盤之上層位,磁性礦物以SP顆粒的亞鐵磁性礦物為主,鐵錳盤下部灰白色強(qiáng)網(wǎng)紋發(fā)育層以反鐵磁性的SSD顆粒為主�；野咨c磚紅色強(qiáng)網(wǎng)紋發(fā)育層之間存在一個(gè)明顯的過渡層(深度4.2-5.2m),亞鐵磁性和反鐵磁性的SP和SSD顆粒共存；5.2m以下反鐵磁性礦物MD顆粒逐漸增加。郎溪剖面沉積過程中物質(zhì)來源穩(wěn)定,磁性礦物類型和顆粒大小隨剖面的變化主要是由風(fēng)化強(qiáng)度的差異導(dǎo)致的。(3)中國南方網(wǎng)紋紅土中的灰色網(wǎng)紋具有多樣化的成因。郎溪剖面灰白色強(qiáng)網(wǎng)紋發(fā)育層是在淺水環(huán)境長(zhǎng)期浸泡后,經(jīng)歷蒸發(fā)過程形成。磚紅色強(qiáng)網(wǎng)紋發(fā)育層是水分沿紅色基質(zhì)中的植物根系和裂隙滲透,使其周圍的局部土體發(fā)生脫鐵作用而形成的。(4) K、Li、Na和Ga在鐵錳盤中虧損,Ba、Mn、Fe、Zn、Mg、Sr、Ca、Pb和Al在鐵錳盤中富集。鐵錳盤很可能是富含F(xiàn)e、Mn、Ba等元素的地下水在剖面附近流出地表,Mn、Ba、Fe、Zn、Sr等惰性元素在地表逐漸富集形成的。
[Abstract]:Quaternary reticulated laterite is widely distributed in tropical and subtropical regions of southern China, and is an important terrestrial carrier for studying the evolution of paleoenvironment. However, the origin and origin of reticulated red soil are still controversial. This study was carried out in Langxi section of Xuancheng. The characteristics of iron-manganese disk layer, grayish white strong net grain developing layer and brick red strong net grain developing layer are obvious in the middle of Langxi section. It is of great significance to study the origin and origin of reticulated red soil. The physical and chemical properties of the reticulated red soil in Langxi section are analyzed by means of magnetic index, granularity index and geochemical element index, and the results of others' research are compared. The results are as follows: (1) Longxi reticulated red soil experienced strong weathering. The content of 5 渭 m component was 4310 ~ 50 渭 m and the particle size was 37. The particle size was obviously smaller than that of Xiashu loess and northwest loess paleosol. The particle size frequency distribution curve and grain size distribution curve were obtained. The accumulative curve of degree probability shows that the near source material has a certain contribution to the material source of Langxi reticulated red soil. (2) the upper position of iron and manganese plate in the section, The magnetic minerals are mainly ferromagnetic minerals of SP particles. The grayish white strong reticulate development layer in the lower part of the iron and manganese disk is mainly composed of antiferromagnetic SSD particles. There is an obvious transition layer between the gray-white and brick-red strong mesh developing layers (depth 4.2-5.2mg, SP and SSD particles of ferromagnetism and anti-ferromagnetism). The anti-ferromagnetic mineral MD particles increased gradually below 5.2m, and the material source was stable during the deposition process of Langxi section. The variation of magnetic mineral type and particle size with the profile is mainly caused by the difference of weathering intensity.) the gray net grain in the reticulated red soil of southern China is of various origin. After immersion in shallow water for a long time, The development layer of brick-red strong mesh is the infiltration of water along the roots and cracks of plants in the red matrix. K Li Li Na and Ga are depleted in the iron-manganese disk. The Pb and Al are enriched in the iron-manganese disk. The iron and manganese plates are probably groundwater rich in Fe, mn, Ba, etc., which flow out of the surface near the surface of the surface, such as MnBaFeFeOZN, Zn, Zn, Sr and so on. Sexual elements are gradually enriched and formed on the surface of the earth.
【學(xué)位授予單位】：華東師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：S15;P531

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