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摘要: 川西高原土壤、水体等多种介质研究表明，该地区的硒含量偏低，天然土壤剖面硒为0.06~0.16μg/g，表层土壤中硒含量为0.075~0.204μg/g，沉积物中硒含量为0.069~0.310μg/g，地表水中硒含量为nd~0.096μg/L，地下水中硒含量为nd~0.058μg/L，均低于我国相应环境介质中硒的平均含量，影响到当地人体健康。本文采集川西高原地区80件岩石样品，同时采集6套岩心样品，这些样品主要以板岩、砂岩、灰岩和页岩为主。采用原子荧光光谱法（AFS）测定硒含量，研究川西高原阿坝地区岩石与岩心样品中硒的地球化学特征和低硒的影响因素。结果表明：岩石硒含量范围为0.030~0.282μg/g，平均值0.09μg/g，低于硒土壤背景值。不同类型岩石中的硒含量大小为：页岩>灰岩>板岩>砂岩。岩石中硒含量在不同地区也表现出较大的差异：松潘>阿坝>壤塘>马尔康>九寨沟>若尔盖>红原，可能是受到岩石类型及有机质和地质环境的影响所致。岩心各剖面的硒含量最小值为0.02~0.07μg/g，最大值为0.21~0.34μg/g，平均值为0.06~0.17μg/g，各钻孔的硒含量明显低于硒的地壳丰度。本研究认为，硒的分布受地质环境、有机质、岩石致密性等条件限制，低硒的地质环境是导致岩石中的硒含量较低的最主要因素。Abstract:
BACKGROUNDStudies on soil, water and other media in the Western Sichuan Plateau show that the selenium content in this area is very low. The selenium concentrations of the natural soil profile, surface soil, sediment, surface water, and groundwater are 0.06-0.16μg/g, 0.075-0.204μg/g, 0.069-0.310μg/g, nd-0.096μg/L and nd-0.058μg/L, respectively, which are all lower than the average selenium content in the corresponding environmental media in China, affecting the health of local people. OBJECTIVESTo explore the geochemical characteristics of selenium in rocks in the study area and to find the influencing factors for low selenium in rocks. METHODSEighty rock samples were collected from the Western Sichuan Plateau, and six core samples were collected at the same time. These samples were mainly slate, sandstone, limestone and shale. Atomic fluorescence spectrometry (AFS) was used to determine the selenium content, and the geochemical characteristics of selenium in rocks and core samples in the Aba area of the Western Sichuan Plateau were studied. RESULTSThe selenium content of rocks ranged from 0.030 to 0.282μg/g, with an average value of 0.09μg/g, which was lower than the crustal abundance of selenium. The content of selenium in different types of rocks was:shale > limestone > slate > sandstone. The selenium content in the rock also showed large differences in different regions:Songpan > Aba > Land Pond > Maerkang > Jiuzhaigou > Ruoergai > Hongyuan, which may be caused by rock type, organic matter and geological environment. The minimum, maximum and average selenium content in each section of the core was 0.02-0.07μg/g, 0.21-0.34μg/g and 0.06-0.17μg/g, respectively. Moreover, the selenium content of each borehole was significantly lower than the crustal abundance of selenium. CONCLUSIONSThe distribution of selenium in rocks is significantly affected by organic matter, lithology and rock compactness. Low selenium in rocks is mainly due to low selenium in environmental media in Western Sichuan. -
Key words:
- rocks /
- core /
- selenium /
- organic matter /
- atomic fluorescence spectrometry /
- geological environment
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表 1 岩石中硒和有机碳(Corg)含量
Table 1. Contens of selenium and organic carbon in rocks
采样地点 样品编号 岩性 Se含量 Corg (μg/g) (%) 马尔康 MEKR-1 板岩 0.051 0.29 MEKR-2 板岩 0.042 0.05 MEKR-4 页岩 0.091 0.15 MEKR-5 板岩 0.038 0.05 MEKR-6 板岩 0.026 0.7 MEKR-11 砂岩 0.052 0.24 MEKR-12 砂板岩 0.063 0.23 MEKR-13 页岩 0.178 0.87 MEKR-14 板岩 0.067 0.13 MEKR-15 页岩 0.218 0.33 MEKR-16 板岩 0.151 0.24 MEKR-17 板岩 0.05 0.31 MEKR-18 板岩 0.042 0.45 阿坝 ABR-1 板岩 0.039 0.05 ABR-2 页岩 0.077 0.36 ABR-3 板岩 0.102 0.57 ABR-4 板岩 0.03 0.05 ABR-7 板岩 0.053 0.3 ABR-5 板岩 0.132 0.68 ABR-6 板岩 0.053 0.09 ABR-8 板岩 0.032 0.05 ABR-11 板岩 0.244 0.59 ABR-12 板岩 0.154 0.45 ABR-13 板岩 0.083 0.23 ABR-14 板岩 0.155 0.64 ABR-15 页岩 0.169 0.32 ABR-16 板岩 0.074 0.39 壤塘 RTR-1 板岩 0.06 0.45 RTR-2 砂岩 0.047 0.07 RTR-3 砂岩 0.083 0.05 RTR-4 板岩 0.053 0.32 RTR-5 板岩 0.042 0.1 RTR-6 板岩 0.041 0.05 RTR-7 板岩 0.056 0.51 RTR-8 板岩 0.083 0.16 RTR-9 板岩 0.041 0.05 RTR-11 砂岩 0.052 0.14 RTR-12 板岩 0.078 0.36 RTR-13 板岩 0.115 0.27 RTR-14 页岩 0.125 1.07 RTR-15 页岩 0.151 0.79 RTR-16 板岩 0.119 0.8 RTR-17 板岩 0.115 0.49 RTR-18 板岩 0.138 0.66 RTR-19 板岩 0.089 0.21 RTR-20 板岩 0.093 0.22 RTR-21 页岩 0.189 0.81 RTR-22 板岩 0.094 0.2 RTR-23 板岩 0.081 0.21 RTR-24 页岩 0.122 0.59 RTR-25 板岩 0.188 0.28 RTR-26 板岩 0.097 0.21 RTR-27 板岩 0.107 0.66 RTR-28 板岩 0.098 0.3 RTR-29 板岩 0.083 0.24 RTR-30 板岩 0.105 0.34 RTR-31 板岩 0.099 0.28 RTR-32 板岩 0.096 0.36 RTR-33 板岩 0.117 0.69 九寨沟 JZGR-1 板岩 0.048 0.06 JZGR-2 板岩 0.078 0.1 JZGR-3 板岩 0.03 0.05 JZGR-4 板岩 0.066 0.07 JZGR-5 板岩 0.093 0.09 JZGR-6 板岩 0.059 0.05 JZGR-7 板岩 0.035 0.05 红原 HYR-1 页岩 0.029 0.05 HYR-2 页岩 0.036 0.31 HYR-3 板岩 0.051 0.05 HYR-4 板岩 0.03 0.05 HYR-5 板岩 0.041 0.33 松潘 SPR-1 板岩 0.154 0.05 SPR-2 板岩 0.282 0.23 SPR-3 板岩 0.23 0.05 SPR-4 板岩 0.072 0.05 若尔盖 REGR-1 板岩 0.033 0.05 REGR-2 板岩 0.051 0.05 REGR-3 板岩 0.038 0.06 REGR-4 板岩 0.054 0.05 REGR-5 砂岩 0.03 0.05 
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表 2 各地区岩石成分主因子分析结果
Table 2. Main factor analysis results of rock components in various regions
采样地点 公因子 因子构成 方差贡献率
(%)累积方差贡献率
(%)马尔康 F1 Se、Ba、Be、Bi、Br、Cd、Pb、Co、Cr、Cs、Cu、F、Ni、Rb、Tl、V、Zn、SiO2、Al2O3、MgO、K2O、FeO 47.193 47.193 F2 Br、Cd、Hf、I、Mn、Mo、P、S、Zr、CaO、Na2O 19.831 67.023 F3 Cl 7.377 74.400 阿坝 F1 Se、As、Ba、Be、Bi、Br、Co、Cr、Cs、Cu、F、Hf、Ni、Pb、Rb、Sn、Ti、Tl、U、V、Zn、Zr、SiO2、Al2O3、TFe2O3、MgO、CaO、Na2O、K2O、FeO、Corg 63.465 63.465 F2 Cd、Hg、I、Li、Mn、Mo、P、S、Sb、Sr、Th 12.045 75.510 F3 Cl 8.120 83.629 壤塘 F1 Ba、Be、Bi、Cr、Cs、Cu、Ni、Rb、Tl、V、Al2O3、K2O、Corg 43.276 43.276 F2 Se、Cd、Hf、I、Mn、Mo、P、S、Sb、Zr、SiO2、TFe2O3、CaO、Na2O 33.790 77.066 F3 Cl、Sr 7.680 84.747 若尔盖 F1 As、Ba、Be、Bi、Cr、Cs、Cu、F、Ni、Rb、Tl、V、Zn、Al2O3、MgO、K2O、Corg 49.570 49.570 F2 Br、Cl、Sr、CaO 12.475 62.045 F3 Se、I、Mo、S 9.407 71.452
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表 3 钻孔岩石类型和硒含量信息统计
Table 3. Statistics of drilling information and selenium contents
样品编号 钻孔深度
(m)采样数量
(件)主要岩石类型 硒含量(μg/g) 钻孔地理位置 最大值 最小值 平均值 中位数 HYYX-1 50.1 24 板岩 0.25 0.04 0.08 0.06 红原县龙日乡中心校 HYYX-2 60.5 23 板岩 0.24 0.03 0.13 0.10 红原县龙日乡乡政府 HYYX-3 47.0 12 板岩 0.34 0.04 0.09 0.07 红原县江茸乡中心校 HYYX-4 45.1 12 砂岩 0.21 0.02 0.06 0.04 红原县安曲乡中心校 HYYX-5 5.6 11 板岩 0.21 0.07 0.12 0.11 红原县壤口乡中心校 MEKYX-1 87.0 30 板岩 0.31 0.06 0.17 0.16 马尔康县邓家桥
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