【摘要】：選取俄羅斯南部亞速海地區(qū)的Chumbur-Kosa(CK)黃土剖面作為研究對(duì)象,系統(tǒng)地分析了剖面中常量地球化學(xué)元素質(zhì)量分?jǐn)?shù)以及它們?cè)陲L(fēng)化過(guò)程中的遷移變化規(guī)律,并通過(guò)常量元素的相關(guān)比值參數(shù)(化學(xué)蝕變指數(shù)、w(Na)/w(K)和殘積系數(shù))對(duì)剖面的風(fēng)化淋溶程度進(jìn)行了初步分析.結(jié)果表明:CK剖面主要物質(zhì)組成以Si、Fe、Ca為主,三者質(zhì)量分?jǐn)?shù)平均值的總和達(dá)到77.61%,常量元素w(Si)w(A1)w(Ca)w(Fe)w(K)w(Mg)w(Na);相對(duì)于上部陸殼的平均值,CK剖面呈現(xiàn)貧Na富Ca的特征;常量地球化學(xué)元素氧化物以及參數(shù)比值與CK剖面各地層特征有較好的對(duì)應(yīng)關(guān)系.S2古土壤層中的常量元素氧化物及參數(shù)比值呈現(xiàn)出與其他古土壤層相反的變化,產(chǎn)生這種現(xiàn)象的原因可能是在L2沉積初期,由于降水作用導(dǎo)致土壤濕度增加,使活動(dòng)性元素向下淋溶,并在S2中發(fā)生富集;CK剖面尚處于早期以去Ca、Na為主的初級(jí)風(fēng)化階段,風(fēng)化程度弱.亞速海地區(qū)黃土化學(xué)風(fēng)化過(guò)程主要受氣候條件的影響,其中降水因素可能起著更為重要的制約作用.
[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.
【作者單位】： 蘭州大學(xué)資源環(huán)境學(xué)院;俄羅斯科學(xué)院南方科學(xué)中心;俄羅斯科學(xué)院地理研究所;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41271024,41411130204)
【分類號(hào)】：S151.92
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本文編號(hào)：2123428