| 一种计算沉积速率的新方法--宇宙尘埃特征元素法 |
| |
| 引用本文： | 吴智平,周瑶琪.一种计算沉积速率的新方法--宇宙尘埃特征元素法[J].沉积学报,2000,18(3):395-399. |
| |
| 作者姓名： | 吴智平 周瑶琪 |
| |
| 作者单位： | 石油大学(华东)石油资源系 山东东营 257062 |
| |
| 摘 要： | 地球每时每刻都在接受宇宙尘埃的沉降,且其年沉降量相对稳定,加之宇宙尘埃中的Ir、Co等特征元素的平均含量较恒定,因此沉积物中宇宙尘埃特征元素Ir、Co的丰度值能够体现出沉积物的沉积速率。当沉积速率较慢时,沉积物中宇宙尘埃特征元素的丰度值较大,反之,则较小。本文在前人工作的基础上,对利用宇宙尘埃特征元素计算沉积速率的方法和原理进行了探讨,并运用该方法对山东临朐N/E界线地层的沉积速率进行了实例研究。与传统方法相比,依据宇宙尘埃特征元素在地层中的分布特征计算沉积速率具有更好的实用性和准确性。
|
| 关 键 词： | 沉积速率 宇宙尘埃 元素Ir、Co |
| 文章编号： | 1000-0550(2000)03-0395-05 |
| 收稿时间： | 1999-05-11 |
| 修稿时间： | 1999年5月11日 |
Using the Characteristic Elementsfrom Meteoritic Must in Strata to Calculate Sedimentation Rate |
| |
| WU Zhi-ping,ZHOU Yao-qi.Using the Characteristic Elementsfrom Meteoritic Must in Strata to Calculate Sedimentation Rate[J].Acta Sedimentologica Sinica,2000,18(3):395-399. |
| |
| Authors: | WU Zhi-ping ZHOU Yao-qi |
| |
| Institution: | Department of Resources Science,University of Petroleum,Dongying Shandong 257062 |
| |
| Abstract: | In the study of sedimentology,one of the most fundamental quantities that geoscientists seek to measure is thesedimentation rate,and it is crucial to a complete understanding of depositional process.
The meteoritic dust is a kind of extraterestrial material with high abundance of iridium and cobalt. Most peoplethink that the deposition quantity of meteoritic dust per year is almost constant on earth surface, and the averageabundance of some characteristic elements such as Ir and Co in meteoritic dust are fixed, so there is a correlation be-tween sedimentation rate and Ir (or Co) concentration. The abundance of Ir (or Co) in the sedimentary samplewith low sedimentation rate is higher than in the sample with high sedimentation rate. According to this, the abun-dance of the element Ir or Co in sediment can be used to measure the deposition rate as a dating tool. Based on theprevious work, the theory and method of using characteristic element from meteoritic dust ot calculate sediment ratehave been suggested, and the formulae can be pariticularly expressed as follows:whereis the sedimentation rate of the sample which we want to calculate, V(CO) is the deposition rate of COfrom meteoritic dust,p is the density of the sample, A (Co) is the total abundance of Co inthe sample, A" (Co) is the abundance of Co in the source rock and w (Co) is contribution coefficient of CO from theterrigenious sources.
Using this method, the sedimentation rates of the Eogene - Neogene section in Linqu County of ShandongProvince has been measured as a case in this paper.
Comparing with common methods, the method of using characteristic element from meteoritic dust to calculatesedimentation rate is more practical and accurate. |
| |
| Keywords: | sedimentation rate meteoritic dust Ir and Co |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
