利用富钴结壳碳酸盐基岩有孔虫矿物标型重建古海洋温度  

Reconstruction of sea surface temperature of paleaoocean using biomineral of fossil foraminifer in the carbonate basement of the ferromanganese crust.

作　　者：佟景贵[1,2] 李胜荣[2] 方念乔[2] 初凤友[3] 王吉中[4] 周学武[5] 

机构地区：[1]深圳职业技术学院,广东深圳518055 [2]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [3]国家海洋局第二海洋研究所海底科学重点实验室,浙江杭州310012 [4]石家庄经济学院资源学院,河北石家庄050031 [5]中国地质大学(武汉),湖北武汉430074

出　　处：《地学前缘》2008年第6期40-43,共4页Earth Science Frontiers

基　　金：国家重点基础研究发展计划"973"项目(2007CB815604);国家大洋专项重点研究项目(DY105-01-04-14;DY105-01-01-01)

摘　　要：重建古海洋海表温度(SST),是研究地质历史时期气候变化控制过程的关键。组成有孔虫化石的矿物Mg/Ca值是海水温度的可靠代用指标,是重建古海洋SST的一个非常好的手段。麦哲伦海山区的富钴结壳和基岩中普遍存在有孔虫化石,这对重建该区的SST有重要意义。利用LA-ICP-MS测得西太平洋麦哲伦海山区富钴结壳碳酸盐基岩中8颗浮游有孔虫化石Globigerinoides sacculifer的Mg/Ca值为3.84±0.36(mmol/mol),通过线性公式:T(℃)=2.898Mg/Ca(mmol/mol)+13.76及已有的定年数据,得到0.91Ma±西太平洋麦哲伦海山区海表温度为24.9+1.1/-1.0℃,未能检索到前人关于该区0.91Ma±前海表温度数据。Reconstruction of past sea surface temperatures（SST）is essential for understanding processes that control climate change throughout the Earth＇s history.The Mg/Ca ratio of the foraminifer is a reliable sea water temperature proxy and is a good tool to reconstruct the SST of palaeoocean.The foraminifer samples were collected from the carbonate basement of a ferromanganese crust from a Magellan seamount in the West Pacific and their age was 0.91 Ma±.Eight of them were examined by LA-ICP-MS for their Mg/Ca ratios.The average of their Mg/Ca ratio was 3.84±0.36（mmol/mol）.Based on the linear fitting（T（℃）=2.898 Mg/Ca（mmol/mol）＋13.76）,the SST of the area around the Magellan Seamounts around 0.91 Ma ago was given at 24.9＋1.1/-1.0 ℃.

关 键 词：富钴结壳 MG/CA 有孔虫 生物矿物 SST 

分 类 号：P736[天文地球—海洋地质]