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Geochemical Characteristics of Rare Earth Elements in Granitic Latosols in Hainan Island

Author: WangXuePing
Tutor: BiHua
School: Hainan Normal University,
Course: Ecology
Keywords: Granitoids latosol Geochemistry Hainan Island Rare Earth Elements
CLC: S153
Type: Master's thesis
Year: 2007
Downloads: 134
Quote: 3
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Abstract


In order to understand the REE geochemical characteristics of the Hainan Island granitoids latosol using ICP-MS (Inductively Coupled Plasma Mass) Determination of rare earth element content and 10 soil samples in 80 soil samples of the Hainan Island granitoids latosol effective REEs element content, statistical analysis of the results showed that: (1) the average of the total amount of rare earth elements in the Hainan Island granitoids latosol ΣREE 426.96μg / g, the effective state REE total ΣREE of the average for 199.06μg / g high corresponding content in the earth's crust, the world's soil REE. Available rare earth elements and soil content of rare earth elements are positively correlated. The total amount of light and heavy rare earth average of the ratio of ΣCe / ΣY 4.48. Light and heavy REE fractionation significantly enriched in the light rare earth elements, the available light rare earth elements. Between geomorphic units (2) total REE average there are very significant differences, the distribution of the central mountains (558.29μg / g) gt; hilly (396.19μg / g) gt; tableland plains (313.11μg / g). The distribution pattern of the light rare earth elements of the average of ΣCe in soils of different geomorphic units and total REE has the same variation. Heavy REE average the ΣY compared to hilly gt; central mountains gt; tableland plains. Effective state of rare earth element content of the hilly area (287.92μg / g) gt; the Central mountain (167.69μg / g) of gt; tableland plains area (141.58μg / g). (3) vertical space, leaching layer A the REE contents deposited layer B, the differences between the parent material C a very significant difference between C and B is not significant. The rare earth element content in each of the generating layer is C (534.12μg / g) gt; B (512.39μg / g) gt; A (290.15μg / g). The effective state the total REE ΣREE average of B (281.07μg / g) gt; C (198.19μg / g) gt; A (117.92μg / g). In addition to the hilly area, other soil profile leaching layer A valid content of rare earth elements were lower than the deposited layer B and the parent material C. The distribution of total REE light rare earth elements in the soil profile has the same variation. The total amount of heavy rare earth ΣY average of B gt; C gt; A. Granite yellow brick red loam genus, granite, brick red loam case of rare earth elements in the soil the total ΣREE the average, the total amount of light rare earth ΣCe average of tableland plains, central mountainous soil distribution law. Effective state of rare earth elements in the layer of soil occurred ΣCe effective state total REE distribution pattern of the unit of the ΣY their landforms. (4) δEu average of 0.46 is weak - moderate Eu depletion. δCe variation range of 0.11-5.38, an average of 1.02, nearly no abnormalities. Each occurrence layer δCe mean changes for A (1.34) gt; C (0.98) gt; B (0.86). Ce in each geomorphic units, two soil is a Variation A layer and mesa plain soil in each soil layer show that Ce granitoids latosol at the near-surface (A layer) fractionation, Ce relative enrichment.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil chemistry, soil physical and chemical
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