Distribution characteristics of soil mercury in Anninghe fault zone
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摘要: 对安宁河断裂带地表破裂带土壤的总汞（THg）、总有机碳（TOC）和主量元素的含量进行了研究。结果表明，在小庙和紫马跨地表破裂带测线上，土壤THg与土壤气Hg含量的峰值位置较为一致，能够指示出断裂带释放Hg的通道位置。小庙、羊福山、野鸡洞和紫马跨地表破裂带土壤垂向剖面上THg与TOC的相关系数表明，TOC是影响土壤THg含量的重要因素。通过土壤THg与TOC，THg与化学蚀变指数（CIA）的相关系数以及THg含量的垂向分布模式，识别出安宁河断裂带土壤THg剖面的干扰来源、背景来源和断裂带脱气来源，为分析Hg的分布特征与构造活动之间的关系提供参考依据。Abstract: In this paper, the concentrations of total mercury, total organic carbon and major elements of soil in the surface rupture zone of Anninghe fault zone were analyzed. The results showed that the peak distribution of total mercury was consistent with that of soil gas mercury in Xiaomiao and Zimakua area, which may reveal the channel location of mercury released from the fault. The correlation coefficient between total mercury and total organic carbon in the soil vertical profiles of Xiaomiao, Yangfushan, Yejidong and Zimakua indicated that, total organic carbon was an important factor to control the distribution of total mercury concentration in the soil. The correlation coefficient among total mercury, total organic carbon and CIA index and vertical distribution of mercury concentration indicated that the sources of mercury in the soil profiles were affected by interference, background and the fault degassing. This study provides a reference for analyzing the relationship between distribution of mercury and tectonic activity.
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Keywords:
- mercury /
- Anninghe fault zone /
- soil /
- TOC /
- weathering degree
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图 1 安宁河断裂带和采样点位置图
Figure 1. Geologic map of the Anninghe fault zone and sampling sites
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图 2 小庙跨断层土壤气Hg （a）、土壤THg （b） 和TOC （c） 的含量分布图
Figure 2. The concentration distribution diagram of gas Hg （a），THg （b） and TOC （c） in soil across Anninghe fault zone in Xiaomiao area
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图 3 紫马跨跨断层土壤气Hg （a）、土壤THg （b） 和土壤TOC （c） 的含量分布图
Figure 3. The concentration distribution diagram of gas Hg （a），THg （b） and TOC （c） in soil across Anninghe fault in Zimakua area
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图 4 安宁河断裂带土壤剖面THg （圆点）和TOC （三角形）含量分布图
（a） 小庙；（b） 羊福山；（c） 野鸡洞；（d） 紫马跨
Figure 4. Distribution of THg （dots） and TOC （triangles） concentration of soil profiles in Anninghe fault zone
（a） Xiaomiao；（b） Yangfushan；（c） Yejidong；（d） Zimakua
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图 5 土壤Hg含量垂向分布示意图（据胡振清，1991）
A为A层土壤，B为B层土壤，H为土层深度，h为干扰异常影响深度（a） 正常场地段；（b） 干扰异常地段；（c） 生根异常地段
Figure 5. The sketch map of vertical distribution of Hg concentration in soil （after Hu，1991）
A represents A layer of soil；B represents B layer of soil；H represents the soil depth；h represents the soil influence depth of disturbance. （a） Hg normal section；（b） Hg abnormal section due to surface disturbance；（c） Hg abnormal section with underground supply
表 1 安宁河断裂带小庙（XM）和紫马跨（ZMK）跨断层土壤样品数据
Table 1 Soil samples data of Xiaomiao （XM） and Zimakua （ZMK） across the Anninghe fault zone
样品编号 TFe2O3含量 MnO含量 样品编号 TFe2O3含量 MnO含量 XM-1 4.45% 0.09% ZMK-1 7.56% 0.15% XM-2 4.80% 0.09% ZMK-2 8.05% 0.18% XM-3 5.02% 0.08% ZMK-3 7.08% 0.09% XM-4 5.38% 0.08% ZMK-4 7.26% 0.18% XM-5 5.95% 0.10% ZMK-5 7.91% 0.12% XM-6 5.73% 0.09% ZMK-6 6.51% 0.09% XM-7 5.14% 0.07% ZMK-7 7.13% 0.09% XM-8 4.98% 0.06% ZMK-8 4.82% 0.09% XM-9 4.63% 0.07% ZMK-9 – – XM-10 4.35% 0.08% ZMK-10 – – XM-11 4.11% 0.08% 
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表 2 安宁河断裂带土壤剖面样品数据
Table 2 Data of soil profile samples in the Anninghe fault zone
位置 采样深度/cm Al2O3含量 CaO含量 K2O含量 Na2O含量 CIA 小庙 90 15.16% 0.52% 2.74% 1.12% 72.46 80 14.66% 0.49% 2.70% 1.09% 72.30 70 14.75% 0.49% 2.66% 1.10% 72.52 60 14.96% 0.46% 2.69% 1.05% 73.17 50 14.26% 0.49% 2.64% 1.09% 71.98 40 13.94% 0.50% 2.62% 1.12% 71.35 30 14.06% 0.55% 2.56% 1.18% 71.08 20 14.26% 0.61% 2.56% 1.24% 70.63 10 14.65% 0.69% 2.62% 1.31% 70.08 羊福山 90 11.46% 0.20% 2.92% 0.55% 72.09 80 11.30% 0.20% 2.80% 0.53% 72.55 70 10.94% 0.18% 2.72% 0.50% 72.73 60 10.40% 0.18% 2.71% 0.46% 72.10 50 10.04% 0.16% 2.73% 0.45% 71.54 40 9.35% 0.17% 2.67% 0.43% 70.49 30 9.17% 0.16% 3.11% 0.48% 67.30 20 9.24% 0.18% 3.15% 0.51% 66.84 10 9.37% 0.20% 2.91% 0.52% 68.16 野鸡洞 90 13.26% 1.00% 4.77% 2.73% 53.58 80 13.79% 1.20% 4.69% 2.34% 55.35 70 13.37% 1.11% 4.35% 1.98% 57.21 60 15.12% 1.37% 4.69% 2.34% 56.94 50 13.22% 1.32% 4.22% 1.92% 56.59 40 13.89% 1.28% 4.70% 2.17% 55.80 30 12.78% 1.21% 4.28% 1.96% 55.92 20 14.34% 1.42% 4.49% 2.31% 56.02 10 12.92% 1.32% 4.34% 2.18% 54.70 紫马跨 70 17.54% 2.42% 1.68% 1.81% 69.28 60 17.00% 2.45% 1.62% 1.78% 69.06 50 17.63% 2.18% 1.69% 1.68% 70.54 40 14.80% 2.22% 1.55% 1.76% 66.45 30 14.25% 2.55% 1.51% 1.87% 64.65 20 14.53% 2.48% 1.56% 1.97% 64.00 10 14.55% 2.34% 1.63% 1.98% 63.72
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