用<sup>36</sup>Cl研究灰岩侵蚀速率的理论与方法

万军伟; 刘存富; 王增银; 晁念英; 王佩仪

用³⁶Cl研究灰岩侵蚀速率的理论与方法

中国地质大学工程学院, 湖北武汉 430074

基金项目:

国家自然科学基金项目 40172103

详细信息

作者简介:
万军伟(1964-), 男, 副教授, 水文水资源博士研究生, 长期从事水文地质、岩溶地质及同位素水文地质的教学与科研工作

中图分类号: P641.3
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出版历程
- 收稿日期: 2001-11-15
- 刊出日期: 2002-03-25

Theory and Method of Determining Erosion Rate in Limestone With ³⁶Cl

Engineering Faculty, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 从理论上研究了方解石中³⁶Cl的5种起源: (1)近地表Ca散裂和散裂成因的中子捕获; (2)由Ca产生的负μ介子捕获; (3)负μ介子捕获以后的中子发射; (4)由快μ介子引起的光致蜕变反应产生的中子; (5)由U裂变和(α, n)反应产生的中子.论述了³⁶Cl在灰岩深度剖面上的4个分布特征: (1)³⁶Cl浓度随深度增加而减少; (2)深度能够自然地区分由不同生成反应形成的³⁶Cl贡献; (3)为了把测量的³⁶Cl浓度与Ca的μ介子捕获及在³⁵Cl上μ介子产生的中子捕获区别开来, 样品必须具有一定N(Ca)/ N(Cl)比值的范围; (4)甚至在最干旱条件下, 灰岩的侵蚀也是不可避免的, 并且在稳定状态下起重要作用.详细描述了³⁶Cl的采样方法和AMS分析技术.研究了测定灰岩侵蚀速率的数学模型, 并且对一些灰岩表面侵蚀速率作了评价.
- 灰岩表面侵蚀速率 /
- ³⁶Cl /
- AMS
Abstract: Five origins of ³⁶Cl in calcite were studied theoretically: (1)near-surface production by Ca spallation and spallogenic neutron capture, (2)negative muon capture by calcium, (3)neutron emission following negative muon capture, (4)neutrons from photodisintegration reactions initiated by fast muons, (5) neutron from uranium fission and(α, n)reactions. Four characteristics of ³⁶Cl distribution for deep profile in limestone have been discussed: (1)³⁶Cl concentration is reduced with depth, (2)depth naturally separates ³⁶Cl contributions from the various production reactions, (3)in order to partition measured ³⁶Cl concentrations into contributions from muon capture on Ca and capture of muon-produced neutrons on ³⁵Cl, the sample set must possess a range of Ca/Cl ratios, (4)limestone erosion is inevitable under even the most arid conditions and plays a significant role in determining steady-state concentrations.Sampling method of ³⁶Cl and AMS analytical technique are described in detail.Mathematical model of determining erosion rate in limestone is studied and some surface erosion rate of limestone are evaluated.
- surface erosion rate of limestone /
- ³⁶Cl /
- accelerator mass spectrometry

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参考文献(11)

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