廣西黎塘巖溶區(qū)富含鐵錳結(jié)核土元素遷移特征
[Abstract]:[objective] to study the characteristics of element content and migration in soils rich in ferromanganese nodules in the karst area of Litang, Guangxi, China. [methods] the representative iron-manganese nodule soil, which is not affected by agricultural cultivation, is selected as the experimental sample and its parent rock is carbonate rock. The soil samples of A (0 ~ 35 cm), B) layer (35 cm) and corresponding rock samples were collected in stratified section A (0 ~ 35 cm), B), and the soil was determined by using the soil of parent rock as clastic rock as a control. [results] in the karst area of Litang, Guangxi, the soil was mainly composed of Si,Al and Fe oxides, the average contents of which were 86.32% and 86.30%, respectively. The contents of SiO_2 and Fe_2O_3 in the soils of the karst area of Litang in Guangxi were lower than those of the control, while the contents of Al_2O_3,Ca O and Mg O were higher than those of the control. The sequence of soil Cd,Pb and Zn content in Litang karst area of Guangxi is ZnPbCd,. The average content of Cd and Pb in section A is higher than that in layer B, but the average content of Zn is lower than that in layer B. Cd, in section A is lower than that in layer B. The average contents of Pb and Zn have exceeded the background value of soil elements in Guangxi and the clastic rock of the parent rock of the soil, not exceeding the secondary standard value of soil environmental quality. The soil in Litang karst area of Guangxi is characterized by high Si-Al coefficient and total leaching coefficient of low base. The weathering leaching intensity of layer B is higher than that of layer A, and the degree of weathering leaching is higher than that of clastic rock as a whole. The correlation coefficients between (LOI) and SiO_2 content, Al_2O_3 content, Si / Al content, total leaching coefficient of base were -0.8063 ~ 3 ~ 0.7091 ~ 0.8570 and -0.2923, respectively. The elements of Mg and Cd in layer B are depleted, and the other elements are enriched or strongly enriched. [conclusion] the parent rocks are carbonate rocks, the content of heavy metals, the strength of weathering and leaching. The characteristics of migration are different from those of clastic rocks, and the existence of ferromanganese nodules has resulted in the accumulation of heavy metals in the soil and potential pollution.
【作者單位】: 中國地質(zhì)科學(xué)院巖溶地質(zhì)研究所/國土資源部廣西壯族自治區(qū)巖溶動力學(xué)重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金項(xiàng)目(41502332) 廣西自然科學(xué)基金項(xiàng)目(2015GXNSFBA139198)
【分類號】:S153
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