| 桂林洞穴滴水及现代碳酸钙(CaCO3)沉积的碳同位素记录及其环境意义 |
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| 关键词:Modern carbonate deposit carbon isotope environmental significance Panlong cave of Guilin |
| 基金项目:国家自然科学基金项目(编号: 40772216)、广西青年科学基金项目(编号: 桂科青0640076)和科技部所控项目(编号: 200903)及“岩溶地下水监测与环境敏感性评价”项目(编号: 1212010634805)联合资助 |
| 作者 | 单位 | E-mail | | 张美良 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 广西桂林 541004 | mlzh@karst.edu.cn | | 朱晓燕 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 广西桂林 541004 | | | 林玉石 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 广西桂林 541004 | | | 陈坤琨 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 广西桂林 541004 | | | 何师意 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 广西桂林 541004 | | | 王华 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 广西桂林 541004 | | | 杨琰 | 中国地质科学院岩溶地质研究所, 国土资源部岩溶动力学重点实验室, 广西桂林 541004 | |
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| Cave Dripping Water and Carbon Isotopic Records of Modern Carbonate (CaCO3) Deposits: Stalagmite in Panlong Cave of Guilin and Its Environmental Significance |
| The trend monitoring of cave dripping water and modern carbonate deposits at 13 monitoring points of dripping water in Panlong Cave of Guilin during the pre-phase (1995~2000) and nearly two hydrological years reveal that there exist two types of modern carbonate (CaCO3) deposits: the first is the modern carbonate (CaCO3) deposit of the perennial dripping water in the cave whoseδ13C values have recorded climate change characteristics of the whole year, and the second is the modern carbonate (CaCO3) deposit of the seasonal dripping water in the cave with the seasonal change characteristics ofδ13C values. The monitoring and isotope analysis of modern carbonate (CaCO3) deposits show that the exterior mountain peaks of the Panlong cave in Guilin are mainly C3 plants (with almost no C4 plants), and theδ13C records of modern carbonate (CaCO3) indicate that the summer monsoon is strong, the rainwater is relatively rich, the biologic activities are strong, and the modern carbonate deposits are fairly well developed in the half year of summer, and the averageδ13C value is -13.13‰ in the half year of summer. Theδ13C values of the modern carbonate (CaCO3) deposits are somewhat negative, with the annual averageδ13C value being -12.23‰ and the maximum negative value being -14.5‰ for the whole year. Theδ13C values of the modern carbonate (CaCO3) deposits are somewhat positive (-10‰~-11‰) due to less rainwater in the half year of winter. In addition, theδ13C values of modern carbonate (CaCO3) formed by dripping water with a lag of one month or half a month show a sudden negative trend and mainly reflect the influence of the CO2 effect, which results in the effect of meteoric precipitation when heavy rain falls or rainstorm occurs no matter whether in the half year of summer or in the half year of winter. |
| ZHANG Mei-liang,ZHU Xiao-yan,LIN yu-shi,CHENG Kun-kun,HE Si-yi,WANG Hua,YANG Yan.2009.Cave Dripping Water and Carbon Isotopic Records of Modern Carbonate (CaCO3) Deposits: Stalagmite in Panlong Cave of Guilin and Its Environmental Significance[J].Acta Geoscientica Sinica,30(5):634-642. |
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