Composition and Genesis of n-Alkanes and Their Hydrogen Isotope in Sediments from Saline Lake, China
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摘要: 青海湖是我国最大的内陆咸水湖泊.对这种湖泊沉积物中正构烷烃及其氢同位素进行了分析, 研究了沉积物中正构烷烃及其同位素组成, 并且与青海湖水生植物及其周围陆生植物的研究结果进行了对比, 研究了它们的成因.结果显示了青海湖表层和柱状沉积物中正构烷烃分布都是类似的, 其特征反映了它们起源于湖泊周围陆生草本植物.青海湖表层沉积物中正构烷烃氢同位素组成特征也与柱状沉积物中的类似, 沉积物样品中正构烷烃氢同位素的组成和分布特征反映了它们主要来自陆生草本植物.从而进一步证实了水体中沉积物的正构烷烃氢同位素组成, 反映了生物源的氢同位素组成, 后者与古气候相关, 因此沉积物的正构烷烃氢同位素组成可以指示古气候.Abstract: The Qinghai Lake is the largest saline lake in China. We study the compositions of n-alkanes and their hydrogen isotope in sediments from the lake, and discuss the genesis of their compositions by the comparison with previous study results of plants from the lake and its surrounding areas. Our results show that the n-alkanes in the surface and core sediments have a similar distribution which reflects the source from terrestrial herbaceous plants in the surrounding regions of the lake. The hydrogen isotopic compositions of n-alkanes in the surface and core sediments are also similar, which indicates that n-alkanes in the sediments were derived from terrestrial herbaceous plants in surrounding regions of the lake. This study further demonstrates that the hydrogen isotopic compositions of n-alkanes in lake sediment reflect the biological source hydrogen isotopic signals that are related to paleoclimate. Therefore, δD values of n-alkanes in lake sediment can be used to indicate paleoclimate.
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Key words:
- geochemistry /
- saline lake /
- sediment /
- distribution of n-alkane /
- hydrogen isotopic composition /
- genesis
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图 2 青海湖表层沉积物中正构烷烃分布
Fig. 2. Histograms of the molecular distributions of n-alkanes in the surface sediments from Qinghai Lake
图 3 青海湖柱状沉积物中正构烷烃分布
Fig. 3. Histograms of the molecular distributions of n-alkanes in the core sediments from Qinghai Lake
图 4 青海湖沉积物中正构烷烃平均δD值分布
Fig. 4. Histograms of the δD mean value distributions of n-alkanes in the sediments from Qinghai Lake
图 5 青海湖沉积物中正构烷烃平均δD值与ACL值相关图
Fig. 5. Cross plot of mean δD values vs. ACL values of n-alkanes in the studied samples
图 6 青海湖及其周围植物中正构烷烃平均δD值分布
Fig. 6. Histograms of the δD mean value distributions of n-alkanes in plants from Qinghai Lake and its surrounding areas
图 7 青海湖柱状沉积物中正构烷烃δD值(a)和ACL(b)值随深度变化
Fig. 7. Cross plot of mean δD (a) and ACL (b) values of n-alkanes in the studied samples vs. depth
表 1 青海湖沉积物中正构烷烃参数
Table 1. Parameters of n-alkanes in the studied samples
样号 沉积物 深度(cm) 相对湖泊位置 坐标 碳数范围 Cmax ACL CPI 表层沉积物 QM-1 黑色泥 表层 北部 37°11′ 15″N；100°04′38″E C16-C33 C27 27.9 4.5 QM-2 黑色泥 表层 西部 37°11′ 48″N；99°49′34″E C21-C31 C29 27.9 8.0 QM-6 灰色泥 表层 北部 37°08′ 18″N; 100°20′44″E C16-C31 C27 27.4 4.7 QM-9 灰色泥 表层 北部 37°11′15″N; 100°04′38″E C17-C33 C25 27.7 4.1 QM-13 灰色泥 表层 西部 36°54′06″N; 99°38 ′01″E C17-C33 C27 27.8 5.7 QM-15 黑色泥 表层 东部 36°32′52″N; 100°41′27″E C21-C31 C29 28.0 5.2 QM-17 灰色泥 表层 南部 36°39′14″N; 100°16′16″E C16-C31 C27 27.5 4.0 QM-20 黑色泥 表层 南部 36°37′ 59″N; 100°06′59″E C16-C31 C27 27.7 3.5 QH-2-3 黑色泥 表层 西部 36°54′06″N; 99°38 ′01″E C17-C31 C27 27.1 4.9 柱状沉积物 QZH-2-10 黑色泥 0~10 西部 37°11′48″N; 99°49′34″E C17-C33 C27 28.0 3.7 QZH-2-20 黑色泥 10~20 西部 37°11′48″N; 99°49′34″E C17-C31 C25 27.5 3.9 QZH-2-30 黑色泥 20~30 西部 37°11′48″N; 99°49′34″E C19-C31 C25 27.0 3.4 QZH-2-40 黑色泥 30~40 西部 37°11′48″N; 99°49′34″E C19-C33 C29 27.9 3.8 QZH-2-50 黑色泥 40~50 西部 37°11′48″N; 99°49′34″E C19-C33 C29 28.0 4.8 注：CPI= [(C25+C27+…+C33)/(C24+C26+…+C32)+(C25+C27+…+C33)/(C26+C28+…+C34)]/2；ACL=[25(nC25)+27(nC27)+29(nC29)+31(nC31)+33(nC33)]/(nC25+nC27+nC29+nC31+nC33). 
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表 2 青海湖及其周围植物中正构烷烃参数和氢同位素组成平均值
Table 2. Mean parameters of n-alkanes and their hydrogen isotopic values in plants from Qinghai Lake and its surrounding areas
植物类型 样品数 平均ACL 平均CPI 平均δD值(‰) 水生眼子菜、绿藻 7个 26.3 7.6 -130.2 水生海韭菜 3个 28.4 18.4 -162.9 陆生嵩草 3个 28.1 13.3 -138.1 陆生早熟禾 3个 27.9 4.3 -165.0 陆生豆黄花棘 1个 28.3 25.7 -164.5 陆生赖草 2个 28.6 18.7 -149.9 陆生树叶 4个 26.8 12.5 -121.7
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表 3 青海湖沉积物中正构烷烃氢同位素组成(‰)
Table 3. Hydrogen isotopic values of n-alkanes in the studied samples
样号 相对湖泊位置 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 平均值 表层沉积物 QM-1 北部 -194.1 -187.5 -179.2 -181.4 -172.9 -176.3 -165.4 -170.1 -158.0 -171.9 -174.4 -175.6 QM-2 西部 -191.4 -189.7 -171.7 -187.6 -185.1 QM-6 北部 -152.4 -169.4 -158.5 -170.6 -171.7 -167.0 -154.9 -164.5 -139.3 -155.9 -120.4 -161.4 -157.2 QM-9 北部 -120.5 -162.1 -160.5 -170.5 -151.6 -161.6 -146.0 -154.8 -131.3 -148.7 -155.2 -151.2 QM-13 西部 -117.5 -119.6 -163.7 -131.6 -169.2 -160.6 -143.6 -158.0 -133.0 -164.6 -155.3 -147.0 QM-15 东部 -118.9 -144.4 -153.8 -174.1 -149.3 -123.1 -148.6 -148.0 -145.0 QM-17 南部 -183.3 -174.5 -200.7 -184.1 -201.6 -210.5 -188.3 -185.4 -172.0 -135.3 -154.7 -181.0 QM-20 南部 -137.8 -167.4 -147.3 -166.9 -172.2 -163.0 -148.9 -159.1 -135.8 -162.1 -161.5 -156.5 QH-2-3 西部 -112.7 -119.3 -139.5 -124.4 -142.5 -129.4 -150.2 -143.8 -132.7 表层样平均值 -143.4 -150.3 -159.8 -157.3 -167.9 -165.7 -169.0 -154.9 -162.6 -138.3 -156.5 -146.2 -163.3 -159.0 柱状沉积物 QZH-2-10 西部 -143.8 -173.9 -163.1 -177.2 -187.1 -177.0 -150.8 -167.9 -149.8 -162.0 -133.4 -166.5 -162.7 QZH-2-20 西部 -157.2 -140.9 -179.9 -158.3 -166.6 -136.4 -155.2 -125.2 -150.3 -144.7 -151.5 QZH-2-30 西部 -138.3 -120.7 -164.8 -141.3 -158.9 -121.0 -151.9 -142.3 -142.4 QZH-2-40 西部 -136.6 -170.1 -158.6 -171.0 -172.6 -148.1 -163.7 -143.1 -161.2 -131.1 -163.2 -156.3 QZH-2-50 西部 -149.4 -130.2 -173.5 -148.9 -166.4 -157.7 -156.0 -158.4 -155.1 柱样平均值 -140.2 -157.8 -142.7 -173.3 -158.6 -168.3 -139.1 -159.3 -139.4 -154.4 -132.3 -158.2 -153.6 表层和柱样总平均值 -143.4 -147.0 -159.0 -151.2 -170.0 -162.8 -168.8 -149.2 -161.4 -138.6 -155.7 -139.2 -161.5 -157.1
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