深海碳酸盐岩心天然热释光变化特征

刘海生; 方念乔; 艾星涛; 马万云; 陈瓞延

深海碳酸盐岩心天然热释光变化特征

1.
清华大学, 物理系原子分子纳米科学教育部重点实验室, 北京, 100084
2.
中国地质大学, 北京, 100083

基金项目: 国家自然科学基金资助项目(40306017;40272074);中国博士后基金资助项目

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出版历程
- 收稿日期: 2003-05-07
- 修回日期: 2003-11-10

Natural thermoluminescence characteristics of carbonate in deep sea cores

1.
Key Laboratory of Atomic and Molecular Nanosciences of Ministry of Education of Department of Physics, Tsinghua University, Beijing 100084, China
2.
China University of Geosciences, Beijing 100083, China

摘要

摘要: 东北印度洋赤道90°E海岭和孟加拉扇MD81349,MD77181岩心记录了30万a来气候变化的历史.分析发现浮游有孔虫壳体(方解石晶体)的天然热释光变化与δ¹⁸O反映的冰川旋回存在着良好的一致性:天然热释光强度的增大与间冰期对应,降低与冰期对应.对MD81349岩心天然热释光时间序列的频谱分析结果显示热释光的显著周期为99,46,23,20和11ka,其中99,46,23,20ka分别与天文学周期中的地球轨道偏心率周期100ka,地轴倾斜度(黄赤交角)周期54,41ka,太阳辐射年度差异的岁差周期23,19ka接近,这表明地球冷暖交替与太阳辐射强度周期性变化密切相关,在不同海水温度条件下结晶形成的方解石晶体的热释光强度差异显著,因而有孔虫壳体积存的热释光能够反映地球气候的变化.
- 热释光 /
- 有孔虫 /
- 冰期旋回 /
- 东北印度洋 /
- 古气候
Abstract: The natural therm olum inescence (NTL) of foram in iferal shells from piston cores MD81349 and MD77181 from the Ninetyeast Ridge and the Bengal Fan of the Indian Ocean were studied for the climate changes during the past 300 ka.It has been found that the TL fluctuations are closely corre lated to the oxygen isotope curves.The high and low TL intensities correspond to the interglacial and glacial stages respectively.The spectrum analysis of TL profile reveals several significant periodicities at 99,46,23,20 and 11 ka.Apparently,the periodicities of 99,46,23 and 20 ka coincide with the orbital eccentricity,obliquity and processional cycles respectively.The results of spectrum analysis and TL fluctuations ind icate that glacialinterg lacial climatic cycles are controlled by the change in the solar insolation.The TL intensities of plank tonic foram in iferal shells can be used to indicate the paleoclmiate changes and the solar insolation.
- thermolum inescence (TL) /
- foram in iferan /
- glacial-interglacial cycle /
- Northeast Indian Ocean /
- paleo-clmiates

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