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地球科学进展  2005, Vol. 20 Issue (8): 815-822    DOI: 10.11867/j.issn.1001-8166.2005.08.0815
IODP研究     
有孔虫壳体的Mg/Ca比值在古环境研究中的应用
李建如
同济大学海洋地质国家重点实验室,上海 200092
THE APPLICATION OF FORAMINIFERAL SHELL Mg/Ca RATIO IN PALEO-ENVIRONMENTAL STUDIES
LI Jianru
Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
 全文: PDF(178 KB)  
摘要:

有孔虫壳体的Mg/Ca比值测定是目前估算海水古温度最受重视的方法,适用于低纬和高纬、表层和深层海水古温度的测定。该方法理论误差仅为±1.1℃,考虑到盐度以及海水pH值的影响,其误差为±1.3℃。运用此法推算出的热带海区表层海水温度领先于全球冰盖的变化,是热带过程调控冰期旋回最强有力的证据之一;与氧同位素相结合,还成功地运用于全球冰量的估算,是目前古环境研究中较常用的古温度测试手段。

关键词: 有孔虫壳体Mg/Ca比值海水温度古环境    
Abstract:

Measurement of Mg/Ca ratio of foraminifera shell is the most popular means in calculating seawater paleotemperature now. It is applicable in low and high latitude areas, to determine surface and deep seawater temperatures. The standard error is 1.1℃, and when the effects of salinity and pH are considered, the error increases to ±1.3℃. The tropical sea surface temperature obtained from Mg/Ca ratio appears to lead ice sheet demise by ~3 ka, which suggests a prominent role of the tropics in pacing ice age cycles. Combining the oxygen-isotope paleotemperature equation, the Mg/Ca ratio of foraminifera shell yields the δ18O water at the time of shell precipitation and the changes of the global ice sheets. This approach has become a good thermometer in determining paleotemperature variations in paleo-environmental studies.

Key words: Foraminifera shell    Mg/Ca ratio    Seawater temperature    Paleo-environment.
收稿日期: 2005-06-16 出版日期: 2005-08-25
:  P736.4  
基金资助:

国家重点基础研究发展规划项目“地球圈层相互作用中的深海过程和深海记录”(编号:G2000078500);科技基础性工作和社会公益研究专项“中国综合大洋钻探计划预研究”(编号:2003DIB3J114);国家高技术研究发展计划“大洋钻探技术预研究”(编号:2004AA615030)资助.

通讯作者: 李建如   
作者简介: 李建如(1978-),男,江苏南通人,博士研究生,主要从事古环境研究. E-mail:peal@gs.tongji.edu.cn
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引用本文:

李建如. 有孔虫壳体的Mg/Ca比值在古环境研究中的应用[J]. 地球科学进展, 2005, 20(8): 815-822.

LI Jianru. THE APPLICATION OF FORAMINIFERAL SHELL Mg/Ca RATIO IN PALEO-ENVIRONMENTAL STUDIES. Advances in Earth Science, 2005, 20(8): 815-822.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2005.08.0815        http://www.adearth.ac.cn/CN/Y2005/V20/I8/815

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