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Characteristics and genetic analysis of selenium-rich soil in Changshan County, western Zhejiang Province |
Dao-Rong LIU1, Hong XU2, Yi ZHOU1, Jian-Guo HOU1, Yuan-Qing SONG1, Yong-Rong WENG1 |
1. Zhejiang Geological Prospecting Institute of China Chemical Geology and Mine Bureau, Hangzhou 310002, China 2. Bureau of Land and Resources of Changshan County, Changshan 324200, China |
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Abstract Through the investigation and study of surface soil in Changshan County, western Zhejiang Province, a large area of selenium-rich soil was found, and the distribution characteristics of selenium were summarized. The mean amount of selenium in the surface soil in the study area is 0.44×10 -6, and different soil types obviously have different amounts of selenium. The amount of soil selenium of the lime (rock) soil is the highest, with the average value being 0.58×10 -6, and different parent materials obviously have different amounts of selenium. The amount of soil selenium content in Holocene flood alluvium is the highest, with the average value being 0.59×10 -6. The probability accumulation curve shows that the exogenous input components in Changshan have little effect on soil selenium. The amount of soil selenium is closely related to the values of V, Mo, Ni, Cr, S,Cu and Cd (P<0.01), and is also closely related to organic matter (r=0.35), with no significant correlation with soil pH. The selenium values of marlstone in Xiyangshan Formation, carbonaceous shale and siliceous rock in Hetang Formation and carbonaceous shale in Ningguo Formation are relatively high. Selenium in soil inherits selenium in rocks. The wide distribution of selenium-rich rocks is the important reason for the formation of selenium-rich soils.
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Received: 13 November 2018
Published: 31 May 2019
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原始样 品数/件 | w(Se)/10-6 | 统计样 品数/件 | w(Se)/10-6 | 标准 离差 | 变异系数 /% | 浙江省 平均值/10-6 | 极大值 | 极小值 | 平均值 | 极大值 | 极小值 | 平均值 | 1887 | 8.19 | 0.03 | 0.49 | 1791 | 0.87 | 0.03 | 0.44 | 0.15 | 33.43 | 0.29 |
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Character of the content of selenium in surface soil of Changshan County
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Frequency of the content of selenium in surface soil of Changshan County
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The space distribution map of selenium in surface soil of Changshan County
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土类 | 样品数/件 | 统计样品 数/件 | w(Se)/ 10-6 | 标准离差 | 变异系数/% | 极大值 | 极小值 | 平均值 | 石灰(岩)土 | 46 | 41 | 1.22 | 0.28 | 0.58 | 0.22 | 38.11 | 红壤 | 692 | 651 | 0.85 | 0.03 | 0.44 | 0.14 | 31.79 | 水稻土 | 971 | 922 | 0.86 | 0.03 | 0.43 | 0.14 | 33.40 | 黄壤 | 57 | 56 | 0.84 | 0.21 | 0.42 | 0.16 | 36.91 | 潮土 | 27 | 27 | 0.68 | 0.15 | 0.41 | 0.12 | 29.42 | 紫色土 | 71 | 70 | 0.85 | 0.08 | 0.40 | 0.16 | 39.36 | 粗骨土 | 23 | 22 | 0.69 | 0.25 | 0.39 | 0.11 | 28.64 |
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Statistics of the content of selenium in different soil types of Changshan County
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成土母质 | 样品数/件 | 统计样品 数/件 | w(Se)/ 10-6 | 标准离差 | 变异系数/% | 极大值 | 极小值 | 平均值 | 全新世洪冲积物 | 130 | 126 | 1.13 | 0.27 | 0.59 | 0.19 | 33.19 | 白云岩类风化物 | 20 | 19 | 0.70 | 0.26 | 0.51 | 0.13 | 24.84 | 炭硅质岩类风化物 | 115 | 105 | 1.01 | 0.06 | 0.49 | 0.20 | 40.82 | 浅变质岩类风化物 | 30 | 28 | 0.79 | 0.25 | 0.48 | 0.13 | 27.21 | 晚更新世红土 | 33 | 32 | 1.09 | 0.16 | 0.47 | 0.21 | 43.96 | 灰岩类风化物 | 64 | 63 | 0.86 | 0.24 | 0.47 | 0.15 | 31.14 | 酸性火山岩类风化物 | 29 | 29 | 0.84 | 0.16 | 0.44 | 0.17 | 39.80 | 泥页岩类风化物 | 116 | 107 | 0.83 | 0.16 | 0.44 | 0.14 | 31.47 | 泥质灰岩类风化物 | 169 | 150 | 0.68 | 0.14 | 0.43 | 0.09 | 20.10 | 砂(砾)岩类风化物 | 236 | 220 | 0.82 | 0.16 | 0.43 | 0.14 | 31.87 | 河漫滩相沉积物 | 366 | 351 | 0.73 | 0.18 | 0.41 | 0.11 | 26.09 | 石灰性紫泥岩类风化物 | 237 | 233 | 0.84 | 0.03 | 0.41 | 0.16 | 39.95 | 砂泥岩互层岩类风化物 | 293 | 282 | 0.82 | 0.13 | 0.41 | 0.14 | 32.71 | 石英砂岩类风化物 | 37 | 36 | 0.78 | 0.09 | 0.40 | 0.16 | 40.07 | 细粒花岗岩类风化物 | 12 | 12 | 0.68 | 0.23 | 0.40 | 0.15 | 37.95 |
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Statistics of the content of selenium in different parent material of Changshan County
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Probability cumulative distribution graph of selenium in surface soil of Changshan County
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元素 | As | B | Cd | Co | Cr | Cu | Ge | Hg | Mn | Mo | N | r | 0.22 | 0.21 | 0.39 | 0.12 | 0.52 | 0.42 | 0.03 | 0.26 | -0.01 | 0.70 | 0.24 | 元素 | Ni | P | Pb | S | V | Zn | Ca | K | Mg | 有机质 | pH | r | 0.60 | 0.25 | 0.28 | 0.51 | 0.78 | 0.36 | 0.16 | -0.02 | 0.06 | 0.35 | 0.04 |
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Relation coefficient between selenium and other contents in soil, Changshan County
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地层/岩体 | 时代 | 主要岩性 | w(Se) /10-6 | 变异系数 /% | 中国东部上 地壳值/10-6 | 富集系数 | 变化范围 | 平均值 | 横山组 | K1 | 泥岩、粉砂岩 | 0.04~0.07 | 0.05 | 30.63 | | 1.0 | 长坞组 | O3 | 砂岩 | 0.03~0.06 | 0.04 | 39.74 | | 0.8 | 西湖组 | D3 | 石英砂岩 | 0.06~0.06 | 0.06 | 2.96 | | 1.2 | 印渚埠组 | O1 | 泥岩 | 0.04~0.08 | 0.06 | 37.38 | | 1.2 | 休宁组 | Nh1 | 砂岩 | 0.06~0.20 | 0.11 | 70.64 | | 2.2 | 宁国组 | O1 | 炭质页岩 | 0.27~0.70 | 0.42 | 58.20 | | 8.4 | 荷塘组 | ∈1 | 炭质页岩、硅质岩 | 0.13~1.05 | 0.59 | 77.96 | 0.05 | 11.8 | 三衢山组 | O3 | 灰岩 | 0.01~0.04 | 0.03 | 45.94 | | 0.6 | 西阳山组 | ∈3 | 泥灰岩 | 0.45~1.62 | 0.90 | 70.89 | | 18.0 | 灯影组 | Z1 | 白云岩 | 0.01~0.09 | 0.05 | 76.77 | | 1.0 | 黄尖组 | K1 | 凝灰岩 | 0.02~0.04 | 0.04 | 29.59 | | 0.8 | 上墅组 | Qb2 | 蚀变凝灰岩 | 0.10~0.58 | 0.28 | 94.02 | | 5.6 | 岩前岩体 | K1 | 花岗岩 | 0.01~0.02 | 0.01 | 38.41 | | 0.2 |
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Mean value of selenium in different types of rocks in Changshan County
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Relationship chart about selenium and other contents of soil
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元素 | V | Mo | Ni | Cr | Cu | 荷塘组 | 200 | 10.6 | 26.3 | 40.6 | 28.9 | 浙江省丰度值 | 53.9 | 1.05 | 18.7 | 37.5 | 16.0 | 富集系数 | 3.71 | 10.10 | 1.41 | 1.08 | 1.81 |
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Some elements content of Hetang formation,Cambrian system in Zhejiang Province 10-6
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Sketch map of Selenium-rich Strata distribution in Changshan County (modified after 1:100 000 Changshan geology sketch map)
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