亚速海地区Chumbur-Kosa黄土剖面元素地球化学特征
发布时间：2018-07-15 08:11
【摘要】：选取俄罗斯南部亚速海地区的Chumbur-Kosa(CK)黄土剖面作为研究对象,系统地分析了剖面中常量地球化学元素质量分数以及它们在风化过程中的迁移变化规律,并通过常量元素的相关比值参数(化学蚀变指数、w(Na)/w(K)和残积系数)对剖面的风化淋溶程度进行了初步分析.结果表明:CK剖面主要物质组成以Si、Fe、Ca为主,三者质量分数平均值的总和达到77.61%,常量元素w(Si)w(A1)w(Ca)w(Fe)w(K)w(Mg)w(Na);相对于上部陆壳的平均值,CK剖面呈现贫Na富Ca的特征;常量地球化学元素氧化物以及参数比值与CK剖面各地层特征有较好的对应关系.S2古土壤层中的常量元素氧化物及参数比值呈现出与其他古土壤层相反的变化,产生这种现象的原因可能是在L2沉积初期,由于降水作用导致土壤湿度增加,使活动性元素向下淋溶,并在S2中发生富集;CK剖面尚处于早期以去Ca、Na为主的初级风化阶段,风化程度弱.亚速海地区黄土化学风化过程主要受气候条件的影响,其中降水因素可能起着更为重要的制约作用.
[Abstract]:The Chumbur-Kosa (CK) loess section in the Azov Sea region of southern Russia is selected as the research object. The mass fraction of constant geochemical elements and their migration and variation during weathering are analyzed systematically. The weathering leaching degree of the section was analyzed by the relative ratio parameters of constant elements (chemical alteration index w (Na) / w (K) and residual coefficient). The results show that the main material composition of the section is Si-FeCa-Ca, the sum of the average mass fraction of the three is 77.61, and the element w (Si) w (A1) w (Ca) w (Fe) w (K) w (Mg-) w (Na), compared with the average value of the upper continental crust, the CK profile shows the characteristics of Na rich in Ca. Constant geochemical element oxides and their ratios have a good correspondence with the characteristics of the layers in the CK profile. The ratios of constant element oxides and their parameters in the paleosol layer of Sch _ 2 show the opposite changes to those of other paleosol layers. The reason for this phenomenon may be that in the early stage of L2 deposition, the active elements are leaching downward due to the increase of soil moisture due to precipitation, and the enrichment of CK profile in S2 is still in the early stage of primary weathering, which is dominated by the removal of CaONa. The degree of weathering is weak. The chemical weathering process of loess in the Azov area is mainly affected by climatic conditions, among which precipitation may play a more important role.
【作者单位】： 兰州大学资源环境学院;俄罗斯科学院南方科学中心;俄罗斯科学院地理研究所;
【基金】：国家自然科学基金项目(41271024,41411130204)
【分类号】：S151.92
，
本文编号：2123428
[Abstract]:The Chumbur-Kosa (CK) loess section in the Azov Sea region of southern Russia is selected as the research object. The mass fraction of constant geochemical elements and their migration and variation during weathering are analyzed systematically. The weathering leaching degree of the section was analyzed by the relative ratio parameters of constant elements (chemical alteration index w (Na) / w (K) and residual coefficient). The results show that the main material composition of the section is Si-FeCa-Ca, the sum of the average mass fraction of the three is 77.61, and the element w (Si) w (A1) w (Ca) w (Fe) w (K) w (Mg-) w (Na), compared with the average value of the upper continental crust, the CK profile shows the characteristics of Na rich in Ca. Constant geochemical element oxides and their ratios have a good correspondence with the characteristics of the layers in the CK profile. The ratios of constant element oxides and their parameters in the paleosol layer of Sch _ 2 show the opposite changes to those of other paleosol layers. The reason for this phenomenon may be that in the early stage of L2 deposition, the active elements are leaching downward due to the increase of soil moisture due to precipitation, and the enrichment of CK profile in S2 is still in the early stage of primary weathering, which is dominated by the removal of CaONa. The degree of weathering is weak. The chemical weathering process of loess in the Azov area is mainly affected by climatic conditions, among which precipitation may play a more important role.
【作者单位】： 兰州大学资源环境学院;俄罗斯科学院南方科学中心;俄罗斯科学院地理研究所;
【基金】：国家自然科学基金项目(41271024,41411130204)
【分类号】：S151.92
，
本文编号：2123428
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