马牙氧同位素组成与气候指标的定量关系

doi:10.11867/j.issn.1001-8166.1996.05.0481

地球科学进展 ›› 1996, Vol. 11 ›› Issue (5): 481 -486. doi: 10.11867/j.issn.1001-8166.1996.05.0481

马牙氧同位素组成与气候指标的定量关系

邓涛，薛祥煦

西北大学地质系新生代地质与环境研究所西安 710069

收稿日期:1995-11-28 修回日期:1996-03-25 出版日期:1996-10-01
通讯作者: 邓涛，男，1963年6月出生，博士，主要从事新生代地质与环境研究.

QUANTITATIVE RELATIONSHIP BETWEEN OXYGEN ISOTOPIC COMPOSITION OF HORSE TEETH AND CLIMATIC SIGNALS

Deng Tao;Xue Xiangxu

Department of Geology,Northwest University,Xi’an 710069

Received:1995-11-28 Revised:1996-03-25 Online:1996-10-01 Published:1996-09-01

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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：δ¹⁸Ｏ＝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。

关键词: 马牙, 氧同位素组成, 气候指标, 大气降水

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.

Key words: Horse tooth, Oxygen isotopic composition, Climatic signal, Precipitaiton

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