ISOTOPIC CHARACTERISTICS OF HOT SPRINGS AND GENESIS OF GEOTHERMAL FIELD IN LUSHAN COUNTY, HENAN PROVINCE
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摘要:
通过对河南省鲁山县五大温泉同位素测试结果的对比, 分析其基本特征, 研究地热田成因, 目的在于进一步查明地热资源条件, 合理开发利用. 从上游到下游, 地热流体氢氧稳定同位素δD、δ18O值总体上呈逐渐增大的趋势. 利用氢氧稳定同位素的组成变化判断地热流体的补给来源于大气降水, 利用其高程效应估算的补给高程为1 070~1 440 m, 补给源区为鲁山县西部至嵩县东南部的山区. 其中1个样品放射性同位素T为1.4±0.8 TU, 另外6个样品均小于1.0 TU, 表明地热流体是1952年以前“古水”成分占优势. 放射性同位素14C结果, 样品R3现代碳百分数为13.00±1.18%, 样品R7为29.68±0.97%, 表明R7混入了部分现代碳. 利用R3现代碳百分数计算地热流体的生成年龄为12.12~15.52 ka.
Abstract:Based on the comparison of isotope test results of five hot springs in Lushan County of Henan Province, the basic characteristics and genesis of geothermal field are analyzed for further identifying the conditions of geothermal resources, as well as rational development and utilization. The δD and δ18O values of hydrogen and oxygen stable isotopes of the geothermal fluid from upper to lower reaches are gradually increasing generally. Based on the composition change of hydrogen and oxygen stable isotopes, it is concluded that the recharge source of geothermal fluid comes from atmospheric precipitation, and the recharge elevation is 1 070-1 440 m estimated by elevation effect, with the recharge source area ranging from western Lushan County to the mountainous area of southeastern Songxian County. The value of radioisotope T in one of the samples is 1.4±0.8 TU, while that of other six samples are all less than 1.0 TU, indicating that the geothermal fluid is dominated by composition of fossil water before 1952. The radioisotope 14C age analysis results show that the modern carbon in sample R3 accounts for 13.00±1.18% and that in sample R7 29.68±0.97%, reflecting that sample R7 is mixed with partial modern carbon. The generation age of geothermal fluid is 12.12-15.52 ka calculated by the percentage of modern carbon in sample R3.
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Key words:
- hot spring /
- geothermal field /
- hydrogen and oxygen isotope /
- Henan Province
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表 1 地热流体及雨水样品同位素测试结果
Table 1. Isotopic test results of geothermal fluid and rainwater samples
样品号 采样地点 δDV-SMOW/‰ δ18OV-SMOW/‰ T/TU 现代碳百分数
（pmc）/%R1 上汤 -78 -11.1 ＜1.0 R2 赵村 -80 -11.2 ＜1.0 R3 中汤 -77 -11.0 ＜1.0 13.00±1.18 R4 温汤 -76 -10.8 ＜1.0 R5 下汤 -72 -10.3 ＜1.0 R6 碱场 -69 -9.5 1.4±0.8 R7 薛寨 -70 -9.7 ＜1.0 29.68±0.97 Y1 尧山镇铁匠炉村 -104 -13.2 8.1±0.8 
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表 2 补给高程计算结果
Table 2. Calculation results of recharge elevation
样品号 采样地点 样点高程/m δD计算补给高程/m δ18O计算补给高程/m R1 上汤 272 1139 1185 R2 赵村 270 1070 1139 R3 中汤 221 1121 1178 R4 温汤 220 1153 1263 R5 下汤 179 1246 1440 R6 碱场 149 1316 1671 R7 薛寨 135 1268 1570
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表 3 14C校正年龄计算结果
Table 3. Calculation results of 14C correction age
样品号 采样地点 统计学校正 化学稀释模型校正 推荐年龄/ka AT/% 校正年龄/ka pH值 H+浓度/（mmol/L） HCO3-含量/(mg/L） b/（mmol/L） a/（mmol/L） AT/% 校正年龄/ka R3 中汤 85 15.52 7.24 5.75E-08 209.0 3.43 0.495 56.31 12.12 12.12~15.52 R7 薛寨 85 8.70 7.40 3.98E-08 190.1 3.12 0.312 54.55 5.03 5.03~8.70
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