干旱区生态环境知识资源中心(Arid): 孢粉浓缩物矿物成分分析及其在孢粉提取方法中的应用

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	孢粉浓缩物矿物成分分析及其在孢粉提取方法中的应用
其他题名	MINERAL COMPOSITION ANALYSIS OF POLLEN CONCENTRATES : A NEW INVESTIGATION INTO POLLEN EXTRACTION METHODS OF LAKE SEDIMENTS IN ARID REGIONS
	李育; 张成琦; 周雪花; 王岳
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2014
卷号	34 期号:3 页码:666-675
中文摘要	孢粉浓缩物作为孢粉学研究的基础和前提,其纯度直接影响到孢粉学研究结论的准确性。干旱区湖泊沉积物孢粉浓缩物中残留的不溶矿物颗粒,对孢粉鉴定、分析和测年等造成干扰。明确不溶颗粒的矿物成分,探讨孢粉提取过程中化学反应作用机制,对完善干旱区湖泊沉积物孢粉浓缩物提取方法有重要意义。本文选取石羊河下游终端湖猪野泽地区沙坑井(SKJ)和九驼梁(JTL)剖面湖泊沉积物及相应层位孢粉浓缩物,进行矿物成分对比研究,结果显示:全样和孢粉浓缩物的矿物成分均以石英和硅酸盐类矿物为主;孢粉浓缩物中矿物组成更为多样,硅酸盐矿物种类与全样差异较大,这可能由于石英与硅酸盐类矿物和氢氟酸反应,在溶液中产生了大量硅酸根、含氟金属络合阳离子和金属阳离子所导致。两种阳离子通过与硅酸根结合,或与原有硅酸盐矿物发生置换反应,使孢粉浓缩物中出现了全样中不存在的硅酸盐或碳酸盐矿物。孢粉浓缩物中较多的矿物种类也可能与样品总量减少有关,因为微量矿物的含量会因其他矿物的大量减少而增加,从而在浓缩物中得以表现。此外,全样矿物与氢氟酸反应后会生成硅凝胶物质,有可能会阻碍酸与样品的进一步反应,使孢粉浓缩物中存在未能完全反应的石英和少量碳酸盐类矿物。因此,干旱区湖泊沉积物孢粉提取过程中,应当慎用氢氟酸,在充分分散样品后,选择适当比重的重液浮选去除大部分石英和硅酸盐类,再使用氢氟酸多次处理,是完善干旱区湖泊沉积物孢粉浓缩物提取方法的有效途径。
英文摘要	As the basis and premise of palynology research, the purity of pollen concentrates is directly related to the accuracy of palynology research. Insoluble mineral particles in pollen concentrates of lake sediments have caused disturbance in pollen identification, analysis, and dating. To explore mineral composition of insoluble particles and the chemical reaction mechanism in pollen extraction has an important significance on perfection of the pollen extraction method of lake sediments in arid areas. In the eastern Qilian Mountains,the Shiyang River drainage area is roughly at geographical coordinates of 37~o02’~39~017’N,100~o57’~ 104~o57’E. Zhuye Lake, the terminal lake of the drainage area, is a tectonic rift basin, belonging to the Qilian Mountains piedmont fault basin. The Quaternary unconsolidated lacustrine and alluvial can reach up to 300meters thick in the basin. In this paper, we chose ten sets of sediment samples from the Shakenjing section (SKJ, 39°00’N, 103°52’E ; altitude : 1305m ; depth :3. 55m) (S1 ~S10) and 6 from the Jiutuoliang section (JTL, 39°09’N, 104°08’E; altitude: 1308m; depth:3.00m) (J1 ~ J6), to conduct a comparative study on the mineral composition. The results revealed that the mineral compositions of lake sediments and pollen concentrates are mainly quartz and silicate minerals. In pollen concentrates samples,mineral composition is more diverse,while silicate mineral types are different from lake sediments. Under the action of hydrofluoric acid,quartz and silicate minerals can produce a large number of silicates, fluoride metal complexing cations and metal cations. These two kinds of cations can combine with silicates, or develop substitution reactions with original silicate minerals. So there are many new kinds of silicate and carbonate minerals in pollen concentrates samples, compared with lake sediments samples. Furthermore, as a result of compensation of diminishing, trace minerals could occur in pollen concentrates samples. Meanwhile, silica gel could hinder the further reaction of acid with samples ; therefore there are quartz and small amounts of carbonate minerals in pollen concentrates. Overall, during the pollen extracting process of lake sediments in arid areas, hydrofluoric acid should be used with caution. It may be an effective way to perfect the pollen extraction method of lake sediments in arid areas if we remove most of the quartz and silicate using heavy liquid flotation. And then, hydrofluoric acid can be used for purifying samples for many times.
中文关键词	孢粉浓缩物 ; 矿物成分分析 ; 湖泊沉积物 ; 干旱区 ; 猪野泽
英文关键词	pollen concentrates mineral composition analysis lake sediments arid regions Zhuye Lake in terminal of the Shiyang River drainage
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY ; PALEONTOLOGY
WOS研究方向	Geology ; Paleontology
CSCD记录号	CSCD:5143893
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231007
作者单位	兰州大学资源环境学院,兰州大学干旱区水循环与水资源研究中心, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	李育,张成琦,周雪花,等. 孢粉浓缩物矿物成分分析及其在孢粉提取方法中的应用[J]. 兰州大学,2014,34(3):666-675.
APA	李育,张成琦,周雪花,&王岳.(2014).孢粉浓缩物矿物成分分析及其在孢粉提取方法中的应用.第四纪研究,34(3),666-675.
MLA	李育,et al."孢粉浓缩物矿物成分分析及其在孢粉提取方法中的应用".第四纪研究 34.3(2014):666-675.