| 马牙氧同位素组成与气候指标的定量关系 |
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| 引用本文： | 邓涛,薛祥煦.马牙氧同位素组成与气候指标的定量关系[J].地球科学进展,1996,11(5):481-486. |
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| 作者姓名： | 邓涛 薛祥煦 |
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| 作者单位： | 西北大学地质系新生代地质与环境研究所 |
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| 摘 要： | 提出以马牙的氧同位素组成作为一种新的代用性气候指标，根据全球不同地点现代野生马类（Ｅｑｕｕｓ属）的牙齿釉质层氧同位素组成建立了与年平均温度的线性关系：δ（１８）Ｏ＝０．５０８０Ｔ＋１０．４９（ｒ＝０．８２），证明马牙氧同位素组成响应于大气降水的氧同位素组成，并且能够代表某一生态区域内的多年平均值。由于哺乳动物牙齿的釉质层具有良好的抗成岩作用能力，因此可以利用马牙化石的氧同位素组成来推算地质历史时期的年平均温度值，对第四纪以来的气候环境演变提供定量化的分析资料。
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| 关 键 词： | 马牙 氧同位素 气候指标 大气 降水 古气候 |
QUANTITATIVE RELATIONSHIP BETWEEN OXYGEN ISOTOPIC COMPOSITION OF HORSE TEETH AND CLIMATIC SIGNALS |
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| Deng Tao,Xue Xiangxu.QUANTITATIVE RELATIONSHIP BETWEEN OXYGEN ISOTOPIC COMPOSITION OF HORSE TEETH AND CLIMATIC SIGNALS[J].Advance in Earth Sciences,1996,11(5):481-486. |
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| Authors: | Deng Tao Xue Xiangxu |
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| Institution: | Department of Geology,Northwest University,Xi’an 710069 |
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| Abstract: | This paper suggests oxygen isotopic composition of horse teeth as a new substitute climatic signal.Based on the oxygen isotopic composition of modern horse(genus Equus)tooth’s enamel which collected from different places in the world,it setst up a linear equation between the oxygen isotopic composition and annual average temperatures:δ(18)O=0. 5080T+10.49(r=0.82). It proves that oxygen isotopic composition of horse teeth responds to that of precipitation,and represents the average value in a ecological region. Because mammal tooth’s enamel is able to efficiently resist influence of diagenesis,oxygen isotopic composition of fossil horse teeth can be used to estimate annual average temperatures in geological time,especially to provide quantitative analytic materials for changes of climate and environments in the Quaternary. |
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| Keywords: | Horse tooth Oxygen isotopic composition Climatic signal Precipitaiton |
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