• 论文 •

### 分形方法在庐山第四纪沉积环境研究中的应用*

1. 南京大学大地海洋科学系, 南京210093
• 收稿日期:1995-01-04 修回日期:1996-05-09 出版日期:1996-09-15 发布日期:1996-09-15
• 基金资助:
* 国家博士后科学基金;南京大学现代分析中心测试基金

### THE APPLICATION OF FRACTAL METHOD TO STUDYING QUATERNARY SEDIMENTAL ENVIRONMENT IN LUSHAN AREA

Zhu Cheng, Yu Shiyong, Liu Xiaonin

1. Department of Geo & Ocean Sciences, Nanjing University, Nanjing 210093
• Received:1995-01-04 Revised:1996-05-09 Online:1996-09-15 Published:1996-09-15

Abstract: The past study has revealed that there is a close relation between the value of Fe3+/Fe2+ and the climatic conditions for forming sediments.Viewing the phenomenon at a different angle,the authors found that the sediments with high value of Fe3+/Fe2+ also have more thermophilous sporopollen. Going a step further.we can find that there is a positive correlation between the value of Fe3+/Fe2+ and the paleo-temperature for forming the sediments.The positive correlation is similar to a power exponent relation.If the value of Fe3+/Fe2+ in vertical profile has an autocorrelation,then the value will show a fractal curve.The relation betewwn the Fe3+/Fe2+ value and paleo-temperature can use a formula to express.that is,T=a+bxD.where,T is paleo-temperature.x is the value of Fe3+/Fe2+,a and b are constants,and D is the fractal dimension of the Fe3+/Fe2+ series.Based on the results of sporopollen identification and the testing data of Fe3+/Fe2+.this paper establishes a nonlinear formula to infer the paleo-temperature in the area,i.e.T=2.3+0.09x1.31.Using the above formula to determine the paleo-temperature change in the area since Q2,we can find that the inferred result has a relative mean deviation of <5%,and this method is more obvious to illustrate the paleo-temperature fluctuation.The inferred result shows that there are 3 times obvious(cold or warm) climate fluctuation in the area since Q2.During the period.the highest annual mean air-temperature was about 22℃,and the lowest value was 3℃ or so.No minus annual mean air temperature was not found.

PACS:

• P931