| 北京石花洞地区水系氢氧同位素及氚含量研究──石花洞研究系列之一 |
| |
| 引用本文： | 李红春,赵树森.北京石花洞地区水系氢氧同位素及氚含量研究──石花洞研究系列之一[J].地震地质,1996,18(4):325-328. |
| |
| 作者姓名： | 李红春 赵树森 |
| |
| 作者单位： | [1]美国南加州大学地球科学系 [2]中国科学院地质研究所 |
| |
| 摘 要： | 北京石花洞地区水系的δＤ平均值为（－６５．４±３．０）‰（ＳＭＯＷ），δ１８Ｏ平均值为（－９．４±０．３）‰（ＳＭＯＷ），氚含量平均值为（３０．８±４．５）ＴＵ。石花洞洞内滴水是由地表水很快下渗得来，受古老地下水的混合作用很小。因此，洞内滴水的稳定同位素组成能够灵敏地反映地表水同位素组成（即重量加权的年平均雨水的同位素组成）的变化。影响洞内滴水的稳定同位素组成的因素主要是年平均气温、年降雨量以及降水气团的来源的变化。利用高分辨率的洞穴碳酸盐的稳定同位素记录．可以建立以湿度变化为主的古气候信息．尤其是我国季风气候的变化历史
|
| 关 键 词： | 同位素年龄 石灰岩 岩溶水 |
ISOTOPE STUDIES OF SHIHUA CAVE-I:δD,δ￣(18)0 AND TRITIUM ACTIVITY OF SHIHUA CAVE,BEIJING |
| |
| Li Hongchun ,Teh-Lung Ku.ISOTOPE STUDIES OF SHIHUA CAVE-I:δD,δ￣(18)0 AND TRITIUM ACTIVITY OF SHIHUA CAVE,BEIJING[J].Seismology and Geology,1996,18(4):325-328. |
| |
| Authors: | Li Hongchun Teh-Lung Ku |
| |
| Abstract: | We have measured δD, δ18O and 3H of surface water, spring water and drip water in Shihua cave area. The average values with the standard deviation of δD and δ18O are (- 65. 4±3. 5)‰, (SMOW) and (-9. 4±0. 3)‰(SMOW), respectively. The average tritium content is (30. 8± 4. 5)TU. These data demonstrate that the drip water in Shihua cave represents fast penetration of surface water above the cave, and the mixing effect of old groundwater is negligible. Therefore, the variations in isotopic composition of cave drip water can reflect changes in isotopic composition of surface water which represent weighted mean annual isotopic composition of precipitation in the locality.The major factors that influence isotopic composition of cave drip water are mean annual air temperature, mean annual rainfall and change in moisture source. This research work forms the basis of using high-resolution also record in speleothem to reconstruct paleoclimatic record in the region, especially for paleomonsoon vari |
| |
| Keywords: | Isotopic age dating Limestone Karst water |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
